diff --git a/.gitignore b/.gitignore
index acb007e4..a63f7b2e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,3 +50,4 @@ sim_mode_auto
 direwolf-pacsatsim-tmp.conf
 groundstation/direwolf-pacsat-tmp.conf
 tlm.bin
+frequency.txt
diff --git a/config b/config
index 634d4d57..7b69b013 100755
--- a/config
+++ b/config
@@ -94,11 +94,21 @@ function check_restart {
 	value=`cat /home/pi/CubeSatSim/.mode`
 	echo "$value" > /dev/null
 	set -- $value
+	MODE=$1
+
+	value=`cat /home/pi/CubeSatSim/sim.cfg`
+	echo "$value" > /dev/null
+	set -- $value
+	if [ "${14}" = "sim" ]  || [ "${14}" = "rig" ] ; then
+		DOPPLER=1
+	else
+		DOPPLER=0
+	fi
 
-#	if [ "$1" = "p" ] || [ "$1" = "P" ] ; then
+#	if [ "$MODE" = "p" ] || [ "$MODE" = "P" ] ; then
 #			reboot=1
 #el
-	if [ "$1" == "f" ] || [ "$1" == "b" ]  || [ "$1" == "e" ] || [ "$1" == "j" ] ; then
+	if [ "$MODE" == "f" ] || [ "$MODE" == "b" ]  || [ "$MODE" == "e" ] || [ "$MODE" == "j" ] ; then
 		FILE=/home/pi/CubeSatSim/battery_saver
 		if [ -f "$FILE" ]; then
 			restart=1
@@ -107,6 +117,8 @@ function check_restart {
 			reboot=1
 #			echo "Need to reboot"
 		fi	
+	elif [ "$MODE" == "m" ] || [ "$DOPPLER" == "1" ] ; then
+		reboot=1
 	else
 		restart=1
 #		echo "Need to restart"
@@ -122,11 +134,11 @@ echo
 
 sudo modprobe snd-aloop
 
-# if [ "$2" = "n" ] ; then
+# if [ "$2" = "-n" ] ; then
 if [ -z "$2" ] ; then
 	noreboot=0
 else
-	if [ "$2" = "n" ] ; then
+	if [ "$2" = "-n" ] ; then
 		echo "Reboot disabled"
 		noreboot=1
 	else
@@ -260,13 +272,51 @@ if [ "$1" = "" ]; then
 		echo "Random Failure Mode is OFF"
 	fi
 
-	echo -n "TX Frequency is: "
-	echo -n ${7}
-	echo -n " MHz, RX Frequency is: "
-	echo -n ${8}
-	echo " MHz"
+HAB=$9
+SQUELCH=$6
+RXPL=${10}
+TXPL=${11}
 
-	if [ "$9" = "yes" ] || [ "$9" = "y" ]; then
+#	echo ${14}
+	if [[ ( "${14}" == "sim" || "${14}" == "rig" ) && ( "$MODE" == "f" || "$MODE" == "b" || "$MODE" == "j") ]] ; then
+		echo "Doppler frequency shift is ON but not active in this mode (only APRS, CW, SSTV, and Repeater modes)"
+		echo -n "TX Frequency is approximately: "
+		echo -n ${7}
+		echo -n " MHz, RX Frequency is: "
+		echo -n ${8}
+		echo " MHz"
+	elif [ "${14}" = "sim" ] ; then
+		echo "Simulated Doppler frequency shift enabled"
+		echo -n "Current TX and RX Frequency (Hz) is: "
+		cat /home/pi/CubeSatSim/frequency.txt
+		echo
+#		echo -n ${7}
+#		echo -n " MHz, RX Frequency is: "
+#		echo -n ${8}
+#		echo " MHz"
+	elif [ "${14}" = "rig" ] ; then
+		echo "rigctld Doppler frequency shift enabled"
+		echo -n "Current TX Frequency (Hz) is: "
+		head -c -11 frequency.txt
+		echo -e "\nCurrent RX Frequency (MHz) is: ${8} or set for a particular satellite"
+	elif [[ ( "$MODE" == "f" || "$MODE" == "b" || "$MODE" == "j") ]] ; then
+		echo "Doppler frequency shift is OFF"
+		echo -n "TX Frequency is approximately: "
+		echo -n ${7}
+		echo -n " MHz, RX Frequency is: "
+		echo -n ${8}
+		echo " MHz"
+	else
+		echo "Doppler frequency shift is OFF"
+		echo -n "TX Frequency is: "
+		echo -n ${7}
+		echo -n " MHz, RX Frequency is: "
+		echo -n ${8}
+		echo " MHz"
+
+	fi
+
+	if [ "$HAB" = "yes" ] || [ "$HAB" = "y" ]; then
 		echo "Balloon mode is ON"
 	else
 		echo "Balloon mode is OFF"
@@ -286,7 +336,7 @@ if [ "$1" = "" ]; then
 		echo "Squelch is off since PacSat or PacSat Ground Station mode"
 	else
 		echo -n "Squelch level is: "
-		echo $6
+		echo $SQUELCH
 	fi
 #	echo
 
@@ -318,10 +368,10 @@ if [ "$1" = "" ]; then
 #	echo
 
 	echo -n "RX PL code is: "
-	echo -n ${10}
+	echo -n $RXPL
 #	echo
 	echo -n " TX PL code is: "
-	echo ${11}
+	echo $TXPL
 #	echo
 
 	FILE=/home/pi/CubeSatSim/battery_saver
@@ -368,7 +418,8 @@ if [ "$1" = "" ]; then
 	echo -e "Current sim.cfg configuration file:"	
 #	echo
 	
-	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13}
+#	echo $1 $2 $3 $4 $5 $SQUELCH $7 $8 $HAB $RXPL $TXPL ${12} ${13} ${14}
+	cat /home/pi/CubeSatSim/sim.cfg
 	echo
 	
 	echo "To change, include an OPTION"
@@ -413,7 +464,22 @@ elif [ "$1" = "-m" ]; then
 	else
 
 		echo "changing CubeSatSim to CW mode"
-		check_restart
+
+		value=`cat /home/pi/CubeSatSim/sim.cfg`
+		echo "$value" > /dev/null
+		set -- $value
+		if [ "${14}" = "sim" ]  || [ "${14}" = "rig" ] ; then
+			DOPPLER=1
+		else
+			DOPPLER=0
+		fi
+
+		if [ "$DOPPLER" = "1" ] ; then
+			restart=1
+		else
+			check_restart
+		fi
+
 		sudo echo "m" > /home/pi/CubeSatSim/.mode
 
 	fi
@@ -497,7 +563,7 @@ elif [ "$1" = "-t" ]; then
 	
 	echo
 	
-#	$1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${12} ${13} 
+#	$1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${12} ${13} ${14}
 
 	echo "Do you want Simulated Telemetry ON (y/n) "
 	read sim
@@ -515,8 +581,8 @@ elif [ "$1" = "-t" ]; then
 #	echo
 	echo -e "\nCubeSatSim configuration sim.cfg file updated to: \n"
 #	echo
-	echo $1 $2 $3 $4 $sim $6 $7 $8 $9 ${10} ${11} ${12} ${13}
-	echo $1 $2 $3 $4 $sim $6 $7 $8 $9 ${10} ${11} ${12} ${13} > /home/pi/CubeSatSim/sim.cfg
+	echo $1 $2 $3 $4 $sim $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14}
+	echo $1 $2 $3 $4 $sim $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14} > /home/pi/CubeSatSim/sim.cfg
 	echo
 ##	echo "Rebooting CubeSatSim with new configuration file"
 ##	echo
@@ -545,7 +611,7 @@ elif [ "$1" = "-c" ]; then
 	echo $oldcallsign
 	echo
 	
-#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${12} ${13}
+#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${12} ${13} ${14}
 
 	echo "Enter callsign in all capitals: "
 	read callsign
@@ -559,8 +625,8 @@ elif [ "$1" = "-c" ]; then
 	
 		echo -e "\nCubeSatSim configuration sim.cfg file updated to: \n"
 
-		echo $callsign $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13}
-		echo $callsign $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} > /home/pi/CubeSatSim/sim.cfg
+		echo $callsign $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14}
+		echo $callsign $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14} > /home/pi/CubeSatSim/sim.cfg
 	fi
 	
 	if [ "$norestart" = "1" ]; then
@@ -593,7 +659,7 @@ elif [ "$1" = "-r" ]; then
 	echo $2
 	echo
 	
-#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} 
+#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14}
 
 	echo -e "Enter Reset Count (integer): "
 
@@ -613,8 +679,8 @@ elif [ "$1" = "-r" ]; then
 
 		echo -e "\nCubeSatSim configuration sim.cfg file updated to: \n"
 
-		echo $1 $resets $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13}
-		echo $1 $resets $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} > /home/pi/CubeSatSim/sim.cfg
+		echo $1 $resets $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14}
+		echo $1 $resets $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14} > /home/pi/CubeSatSim/sim.cfg
 	fi	
 
 	if [ "$norestart" = "1" ]; then
@@ -648,7 +714,7 @@ elif [ "$1" = "-l" ]; then
 	echo $3
 	echo
 	
-#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13}
+#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14}
 
 	echo -e "Enter latitude  (decimal degrees, positive is north): "
 
@@ -690,8 +756,8 @@ elif [ "$1" = "-l" ]; then
 	fi 
 
 	echo -e "\nCubeSatSim configuration sim.cfg file updated to: \n"
-	echo $1 $2 $lat $long $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13}
-	echo $1 $2 $lat $long $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} > /home/pi/CubeSatSim/sim.cfg
+	echo $1 $2 $lat $long $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14}
+	echo $1 $2 $lat $long $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14} > /home/pi/CubeSatSim/sim.cfg
 	
 	if [ "$norestart" = "1" ]; then
 		echo 
@@ -1002,7 +1068,7 @@ elif [ "$1" = "-q" ]; then
 	echo $6
 	echo
 	
-#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13}
+#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14}
 
 	echo -e "Enter squelch  (integer 1 - 8): "
 
@@ -1024,8 +1090,8 @@ elif [ "$1" = "-q" ]; then
 #	echo
 	echo -e "\nCubeSatSim configuration sim.cfg file updated to: \n"
 #	echo
-	echo $1 $2 $3 $4 $5 $sq $7 $8 $9 ${10} ${11} ${12} ${13}
-	echo $1 $2 $3 $4 $4 $sq $7 $8 $9 ${10} ${11} ${12} ${13} > /home/pi/CubeSatSim/sim.cfg
+	echo $1 $2 $3 $4 $5 $sq $7 $8 $9 ${10} ${11} ${12} ${13} ${14}
+	echo $1 $2 $3 $4 $4 $sq $7 $8 $9 ${10} ${11} ${12} ${13} ${14} > /home/pi/CubeSatSim/sim.cfg
 	echo
 	echo "Restarting CubeSatSim with new configuration file"
 ##	echo
@@ -1061,7 +1127,7 @@ elif [ "$1" = "-P" ]; then
 	echo ${11}
 	echo
 	
-#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13}
+#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14}
 
 	echo -e "Enter RX PL value integer 0: None, 01-38： CTCSS （analog, 39-121：CDCSS （digital）"
 
@@ -1104,13 +1170,13 @@ elif [ "$1" = "-P" ]; then
 #	echo
 	echo -e "\nCubeSatSim configuration sim.cfg file updated to: \n"
 #	echo
-	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 $rxpl $txpl ${12} ${13}
-	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 $rxpl $txpl ${12} ${13} > /home/pi/CubeSatSim/sim.cfg
+	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 $rxpl $txpl ${12} ${13} ${14}
+	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 $rxpl $txpl ${12} ${13} ${14} > /home/pi/CubeSatSim/sim.cfg
 	echo
 ##	echo "Rebooting CubeSatSim with new configuration file"
 ##	echo
 
-	reboot=1
+	restart=1
 ##	sudo reboot now
 #	sudo systemctl restart cubesatsim
 
@@ -1135,7 +1201,7 @@ elif [ "$1" = "-F" ]; then
 	echo $8
 	echo	
 
-#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13}
+#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14}
 
 	echo "Enter tx frequency as 4XX.XXXX: "
 	read tx
@@ -1156,8 +1222,13 @@ elif [ "$1" = "-F" ]; then
 	fi
 	echo -e "\nCubeSatSim configuration sim.cfg file updated to: \n"
 
-	echo $1 $2 $3 $4 $5 $6 $tx $rx $9 ${10} ${11} ${12} ${13}
-	echo $1 $2 $3 $4 $5 $6 $tx $rx $9 ${10} ${11} ${12} ${13} > /home/pi/CubeSatSim/sim.cfg
+	echo $1 $2 $3 $4 $5 $6 $tx $rx $9 ${10} ${11} ${12} ${13} ${14}
+	echo $1 $2 $3 $4 $5 $6 $tx $rx $9 ${10} ${11} ${12} ${13} ${14} > /home/pi/CubeSatSim/sim.cfg
+
+	rxf=$(echo "$rx * 1000000" | bc)
+	txf=$(echo "$tx * 1000000" | bc)
+	echo $txf $rxf
+	echo $txf $rxf > /home/pi/CubeSatSim/frequency.txt
 
 	echo
 	echo "Restarting CubeSatSim with new configuration file"
@@ -1228,7 +1299,7 @@ elif [ "$1" = "-H" ]; then
 	
 	echo
 	
-#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13}
+#	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14} 
 
 	echo "Do you want Balloon mode ON (y/n) "
 	read hab
@@ -1245,8 +1316,8 @@ elif [ "$1" = "-H" ]; then
 #	echo
 	echo -e "\nCubeSatSim configuration sim.cfg file updated to: \n"
 #	echo
-	echo $1 $2 $3 $4 $5 $6 $7 $8 $hab ${10} ${11} ${12} ${13}
-	echo $1 $2 $3 $4 $5 $6 $7 $8 $hab ${10} ${11} ${12} ${13} > /home/pi/CubeSatSim/sim.cfg
+	echo $1 $2 $3 $4 $5 $6 $7 $8 $hab ${10} ${11} ${12} ${13} ${14}
+	echo $1 $2 $3 $4 $5 $6 $7 $8 $hab ${10} ${11} ${12} ${13} ${14} > /home/pi/CubeSatSim/sim.cfg
 	echo
 ##	echo "Rebooting CubeSatSim with new configuration file"
 ##	echo
@@ -1425,7 +1496,7 @@ elif [ "$1" = "-g" ]; then
 
 		echo "Resetting"
 
-		echo "AMSAT 0 0 0 no 3 434.9 435 no 0 0" > /home/pi/CubeSatSim/sim.cfg
+		echo "AMSAT 0 0 0 no 3 434.9 435 no 0 0 no 60 no" > /home/pi/CubeSatSim/sim.cfg
 	
 		sudo echo "b" > /home/pi/CubeSatSim/.mode
 	
@@ -1721,7 +1792,7 @@ elif [ "$1" = "-U" ]; then
 	
 	echo
 	
-#	$1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${12} ${13} 
+#	$1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${12} ${13} ${14}
 
 	echo "Do you want Random Simulated Failure ON (y/n) "
 	read sim
@@ -1761,8 +1832,8 @@ elif [ "$1" = "-U" ]; then
 #	echo
 	echo -e "\nCubeSatSim configuration sim.cfg file updated to: \n"
 #	echo
-	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} $sim $time
-	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} $sim $time > /home/pi/CubeSatSim/sim.cfg
+	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} $sim $time ${14}
+	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} $sim $time ${14} > /home/pi/CubeSatSim/sim.cfg
 	echo
 
 	if [ "${12}" != "$sim" ] || [ "${13}" != "$time" ] ; then
@@ -1888,6 +1959,69 @@ elif [ "$1" = "-k" ]; then
 	reboot=1
 #	sudo systemctl restart pacsatsim
 
+elif [ "$1" = "-K" ]; then
+
+	echo	
+	echo "Editing the Doppler frequency shift setting in"
+	echo  "the configuration file for CubeSatSim"	
+	echo
+	
+	value=`cat /home/pi/CubeSatSim/sim.cfg`
+	echo "$value" > /dev/null
+	set -- $value
+	doppler="${14}"
+
+	if [ "${14}" = "sim" ] ; then
+		echo "Simulated Doppler frequency shift mode enabled"
+	elif [ "${14}" = "rig" ] ; then
+		echo "rigctld Doppler frequency shift mode enabled"
+	else
+		echo "Doppler frequency shift is OFF"
+	fi
+	
+	echo
+	
+#	$1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${12} ${13} ${14}
+
+	echo "Do you want Doppler frequency shift ON (y/n) "
+	read sim
+	echo
+	
+	if [ "$sim" = "y" ] || [ "$sim" = "yes" ]  ; then
+		doppler="yes"
+		echo "Do you want simulated Doppler shift or rigctld Doppler (sim/rig)"
+		read doppler
+
+		if [ "$doppler" = "sim" ] ; then
+			echo "Simulated Doppler frequency shift mode enabled"
+		elif [ "$doppler" = "rig" ] ; then
+			echo "rigctld Doppler frequency shift mode enabled"
+		else
+			doppler="no"
+			echo "sim or rig not entered. Doppler frequency shift is OFF"
+		fi
+	else
+		doppler="no"
+		echo " Doppler frequency shift is OFF"
+	fi
+	
+#	echo
+	echo -e "\nCubeSatSim configuration sim.cfg file updated to: \n"
+#	echo
+	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} $doppler
+	echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} $doppler > /home/pi/CubeSatSim/sim.cfg
+	echo
+
+	value=`cat /home/pi/CubeSatSim/.mode`	
+	echo "$value" > /dev/null
+	set -- $value
+
+#	if [[ ( "$doppler" == "y" || "$doppler" == "yes" ) && ( "$1" == "m" ) && ( "$doppler" == "no" ) ]] ; then
+#		reboot=1
+#	else
+		restart=1
+#	fi
+
 elif [ "$1" = "-h" ]; then
 
 	echo "config OPTION"
@@ -1934,6 +2068,7 @@ elif [ "$1" = "-h" ]; then
 	echo "   -N     Set next mode or failure"
 	echo "   -u     Change gpsd state"
 	echo "   -k     Reset the PacSatSim Configuration"
+	echo "   -K     Change the Doppler frequency shift setting"
 
 	echo
 	exit
diff --git a/frequency.py b/frequency.py
new file mode 100644
index 00000000..d05b2e82
--- /dev/null
+++ b/frequency.py
@@ -0,0 +1,865 @@
+#!/usr/bin/env python
+
+#import subprocess
+import time
+from time import sleep
+#import os
+import sys
+from os import system
+
+def check_frequency():
+
+	global tx_doppler_freq_hz
+	global rx_doppler_freq_hz
+	tx_OK = False
+	rx_OK = False
+
+	if tx_doppler_freq_hz > 450000000:
+		tx_doppler_freq_hz = 435200000
+	elif (tx_doppler_freq_hz < 420000000) and (tx_doppler_freq_hz > 148000000):
+		tx_doppler_freq_hz = 434700000
+	elif (tx_doppler_freq_hz < 144000000):
+		tx_doppler_freq_hz = 434600000
+	else:
+		tx_OK = True
+
+	if rx_doppler_freq_hz > 450000000:
+		rx_doppler_freq_hz = 435200000
+	elif (rx_doppler_freq_hz < 420000000) and (rx_doppler_freq_hz > 148000000):
+		rx_doppler_freq_hz = 434700000
+	elif (rx_doppler_freq_hz < 144000000):
+		rx_doppler_freq_hz = 434600000
+	else:
+		rx_OK = True
+
+	if (tx_OK != True) or (rx_OK != True):
+		print("Error - frequency out of range!")
+
+iss_doppler_passes = {
+	88: [
+	{"time_sec": 1, "doppler_434_khz": 9987, "doppler_144_khz": 3329},
+	{"time_sec": 2, "doppler_434_khz": 9987, "doppler_144_khz": 3329},
+	{"time_sec": 3, "doppler_434_khz": 9987, "doppler_144_khz": 3329},
+	{"time_sec": 4, "doppler_434_khz": 9987, "doppler_144_khz": 3329},
+	{"time_sec": 5, "doppler_434_khz": 9987, "doppler_144_khz": 3329},
+	{"time_sec": 6, "doppler_434_khz": 9987, "doppler_144_khz": 3329},
+	{"time_sec": 7, "doppler_434_khz": 9987, "doppler_144_khz": 3329},
+	{"time_sec": 8, "doppler_434_khz": 9987, "doppler_144_khz": 3329},
+	{"time_sec": 9, "doppler_434_khz": 9987, "doppler_144_khz": 3329},
+	{"time_sec": 10, "doppler_434_khz": 9987, "doppler_144_khz": 3329},
+	{"time_sec": 11, "doppler_434_khz": 9987, "doppler_144_khz": 3329},
+	{"time_sec": 12, "doppler_434_khz": 9986, "doppler_144_khz": 3329},
+	{"time_sec": 13, "doppler_434_khz": 9986, "doppler_144_khz": 3329},
+	{"time_sec": 14, "doppler_434_khz": 9986, "doppler_144_khz": 3329},
+	{"time_sec": 15, "doppler_434_khz": 9986, "doppler_144_khz": 3329},
+	{"time_sec": 16, "doppler_434_khz": 9986, "doppler_144_khz": 3329},
+	{"time_sec": 17, "doppler_434_khz": 9985, "doppler_144_khz": 3328},
+	{"time_sec": 18, "doppler_434_khz": 9985, "doppler_144_khz": 3328},
+	{"time_sec": 19, "doppler_434_khz": 9985, "doppler_144_khz": 3328},
+	{"time_sec": 20, "doppler_434_khz": 9985, "doppler_144_khz": 3328},
+	{"time_sec": 21, "doppler_434_khz": 9984, "doppler_144_khz": 3328},
+	{"time_sec": 22, "doppler_434_khz": 9984, "doppler_144_khz": 3328},
+	{"time_sec": 23, "doppler_434_khz": 9984, "doppler_144_khz": 3328},
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+	{"time_sec": 480, "doppler_434_khz": -9530, "doppler_144_khz": -3176},
+	{"time_sec": 481, "doppler_434_khz": -9537, "doppler_144_khz": -3178},
+	{"time_sec": 482, "doppler_434_khz": -9551, "doppler_144_khz": -3183},
+	{"time_sec": 483, "doppler_434_khz": -9557, "doppler_144_khz": -3185},
+	{"time_sec": 484, "doppler_434_khz": -9564, "doppler_144_khz": -3187},
+	{"time_sec": 485, "doppler_434_khz": -9570, "doppler_144_khz": -3189},
+	{"time_sec": 486, "doppler_434_khz": -9583, "doppler_144_khz": -3194},
+	{"time_sec": 487, "doppler_434_khz": -9589, "doppler_144_khz": -3196},
+	{"time_sec": 488, "doppler_434_khz": -9595, "doppler_144_khz": -3198},
+	{"time_sec": 489, "doppler_434_khz": -9601, "doppler_144_khz": -3200},
+	{"time_sec": 490, "doppler_434_khz": -9607, "doppler_144_khz": -3202},
+	{"time_sec": 491, "doppler_434_khz": -9619, "doppler_144_khz": -3206},
+	{"time_sec": 492, "doppler_434_khz": -9625, "doppler_144_khz": -3208},
+	{"time_sec": 493, "doppler_434_khz": -9630, "doppler_144_khz": -3209},
+	{"time_sec": 494, "doppler_434_khz": -9636, "doppler_144_khz": -3211},
+	{"time_sec": 495, "doppler_434_khz": -9642, "doppler_144_khz": -3213},
+	{"time_sec": 496, "doppler_434_khz": -9652, "doppler_144_khz": -3217},
+	{"time_sec": 497, "doppler_434_khz": -9658, "doppler_144_khz": -3219},
+	{"time_sec": 498, "doppler_434_khz": -9663, "doppler_144_khz": -3220},
+	{"time_sec": 499, "doppler_434_khz": -9668, "doppler_144_khz": -3222},
+	{"time_sec": 500, "doppler_434_khz": -9678, "doppler_144_khz": -3225},
+	{"time_sec": 501, "doppler_434_khz": -9683, "doppler_144_khz": -3227},
+	{"time_sec": 502, "doppler_434_khz": -9687, "doppler_144_khz": -3228},
+	{"time_sec": 503, "doppler_434_khz": -9692, "doppler_144_khz": -3230},
+	{"time_sec": 504, "doppler_434_khz": -9697, "doppler_144_khz": -3232},
+	{"time_sec": 505, "doppler_434_khz": -9706, "doppler_144_khz": -3235},
+	{"time_sec": 506, "doppler_434_khz": -9710, "doppler_144_khz": -3236},
+	{"time_sec": 507, "doppler_434_khz": -9715, "doppler_144_khz": -3238},
+	{"time_sec": 508, "doppler_434_khz": -9719, "doppler_144_khz": -3239},
+	{"time_sec": 509, "doppler_434_khz": -9727, "doppler_144_khz": -3242},
+	{"time_sec": 510, "doppler_434_khz": -9732, "doppler_144_khz": -3243},
+	{"time_sec": 511, "doppler_434_khz": -9736, "doppler_144_khz": -3245},
+	{"time_sec": 512, "doppler_434_khz": -9740, "doppler_144_khz": -3246},
+	{"time_sec": 513, "doppler_434_khz": -9747, "doppler_144_khz": -3248},
+	{"time_sec": 514, "doppler_434_khz": -9751, "doppler_144_khz": -3250},
+	{"time_sec": 515, "doppler_434_khz": -9755, "doppler_144_khz": -3251},
+	{"time_sec": 516, "doppler_434_khz": -9759, "doppler_144_khz": -3252},
+	{"time_sec": 517, "doppler_434_khz": -9763, "doppler_144_khz": -3254},
+	{"time_sec": 518, "doppler_434_khz": -9770, "doppler_144_khz": -3256},
+	{"time_sec": 519, "doppler_434_khz": -9773, "doppler_144_khz": -3257},
+	{"time_sec": 520, "doppler_434_khz": -9777, "doppler_144_khz": -3258},
+	{"time_sec": 521, "doppler_434_khz": -9780, "doppler_144_khz": -3259},
+	{"time_sec": 522, "doppler_434_khz": -9787, "doppler_144_khz": -3262},
+	{"time_sec": 523, "doppler_434_khz": -9791, "doppler_144_khz": -3263},
+	{"time_sec": 524, "doppler_434_khz": -9794, "doppler_144_khz": -3264},
+	{"time_sec": 525, "doppler_434_khz": -9797, "doppler_144_khz": -3265},
+	{"time_sec": 526, "doppler_434_khz": -9800, "doppler_144_khz": -3266},
+	{"time_sec": 527, "doppler_434_khz": -9807, "doppler_144_khz": -3268},
+	{"time_sec": 528, "doppler_434_khz": -9810, "doppler_144_khz": -3269},
+	{"time_sec": 529, "doppler_434_khz": -9813, "doppler_144_khz": -3270},
+	{"time_sec": 530, "doppler_434_khz": -9816, "doppler_144_khz": -3271},
+	{"time_sec": 531, "doppler_434_khz": -9822, "doppler_144_khz": -3273},
+	{"time_sec": 532, "doppler_434_khz": -9825, "doppler_144_khz": -3274},
+	{"time_sec": 533, "doppler_434_khz": -9827, "doppler_144_khz": -3275},
+	{"time_sec": 534, "doppler_434_khz": -9830, "doppler_144_khz": -3276},
+	{"time_sec": 535, "doppler_434_khz": -9833, "doppler_144_khz": -3277},
+	{"time_sec": 536, "doppler_434_khz": -9838, "doppler_144_khz": -3279},
+	{"time_sec": 537, "doppler_434_khz": -9841, "doppler_144_khz": -3280},
+	{"time_sec": 538, "doppler_434_khz": -9843, "doppler_144_khz": -3280},
+	{"time_sec": 539, "doppler_434_khz": -9846, "doppler_144_khz": -3281},
+	{"time_sec": 540, "doppler_434_khz": -9851, "doppler_144_khz": -3283},
+	{"time_sec": 541, "doppler_434_khz": -9853, "doppler_144_khz": -3284},
+	{"time_sec": 542, "doppler_434_khz": -9856, "doppler_144_khz": -3285},
+	{"time_sec": 543, "doppler_434_khz": -9858, "doppler_144_khz": -3285},
+	{"time_sec": 544, "doppler_434_khz": -9861, "doppler_144_khz": -3286},
+	{"time_sec": 545, "doppler_434_khz": -9865, "doppler_144_khz": -3288},
+	{"time_sec": 546, "doppler_434_khz": -9867, "doppler_144_khz": -3288},
+	{"time_sec": 547, "doppler_434_khz": -9870, "doppler_144_khz": -3289},
+	{"time_sec": 548, "doppler_434_khz": -9872, "doppler_144_khz": -3290},
+	{"time_sec": 549, "doppler_434_khz": -9876, "doppler_144_khz": -3291},
+	{"time_sec": 550, "doppler_434_khz": -9878, "doppler_144_khz": -3292},
+	{"time_sec": 551, "doppler_434_khz": -9880, "doppler_144_khz": -3293},
+	{"time_sec": 552, "doppler_434_khz": -9882, "doppler_144_khz": -3293},
+	{"time_sec": 553, "doppler_434_khz": -9886, "doppler_144_khz": -3295},
+	{"time_sec": 554, "doppler_434_khz": -9888, "doppler_144_khz": -3295},
+	{"time_sec": 555, "doppler_434_khz": -9890, "doppler_144_khz": -3296},
+	{"time_sec": 556, "doppler_434_khz": -9892, "doppler_144_khz": -3297},
+	{"time_sec": 557, "doppler_434_khz": -9894, "doppler_144_khz": -3297},
+	{"time_sec": 558, "doppler_434_khz": -9898, "doppler_144_khz": -3299},
+	{"time_sec": 559, "doppler_434_khz": -9899, "doppler_144_khz": -3299},
+	{"time_sec": 560, "doppler_434_khz": -9901, "doppler_144_khz": -3300},
+	{"time_sec": 561, "doppler_434_khz": -9903, "doppler_144_khz": -3300},
+	{"time_sec": 562, "doppler_434_khz": -9906, "doppler_144_khz": -3301},
+	{"time_sec": 563, "doppler_434_khz": -9908, "doppler_144_khz": -3302},
+	{"time_sec": 564, "doppler_434_khz": -9910, "doppler_144_khz": -3303},
+	{"time_sec": 565, "doppler_434_khz": -9911, "doppler_144_khz": -3303},
+	{"time_sec": 566, "doppler_434_khz": -9913, "doppler_144_khz": -3304},
+	{"time_sec": 567, "doppler_434_khz": -9916, "doppler_144_khz": -3305},
+	{"time_sec": 568, "doppler_434_khz": -9918, "doppler_144_khz": -3305},
+	{"time_sec": 569, "doppler_434_khz": -9919, "doppler_144_khz": -3306},
+	{"time_sec": 570, "doppler_434_khz": -9921, "doppler_144_khz": -3306},
+	{"time_sec": 571, "doppler_434_khz": -9923, "doppler_144_khz": -3307},
+	{"time_sec": 572, "doppler_434_khz": -9925, "doppler_144_khz": -3308},
+	{"time_sec": 573, "doppler_434_khz": -9926, "doppler_144_khz": -3308},
+	{"time_sec": 574, "doppler_434_khz": -9928, "doppler_144_khz": -3309},
+	{"time_sec": 575, "doppler_434_khz": -9930, "doppler_144_khz": -3309},
+	{"time_sec": 576, "doppler_434_khz": -9932, "doppler_144_khz": -3310},
+	{"time_sec": 577, "doppler_434_khz": -9933, "doppler_144_khz": -3310},
+	{"time_sec": 578, "doppler_434_khz": -9934, "doppler_144_khz": -3311},
+	{"time_sec": 579, "doppler_434_khz": -9936, "doppler_144_khz": -3311},
+	{"time_sec": 580, "doppler_434_khz": -9938, "doppler_144_khz": -3312},
+	{"time_sec": 581, "doppler_434_khz": -9939, "doppler_144_khz": -3312},
+	{"time_sec": 582, "doppler_434_khz": -9940, "doppler_144_khz": -3313},
+	{"time_sec": 583, "doppler_434_khz": -9942, "doppler_144_khz": -3313},
+	{"time_sec": 584, "doppler_434_khz": -9944, "doppler_144_khz": -3314},
+	{"time_sec": 585, "doppler_434_khz": -9945, "doppler_144_khz": -3314},
+	{"time_sec": 586, "doppler_434_khz": -9946, "doppler_144_khz": -3315},
+	{"time_sec": 587, "doppler_434_khz": -9947, "doppler_144_khz": -3315},
+	{"time_sec": 588, "doppler_434_khz": -9949, "doppler_144_khz": -3316},
+	{"time_sec": 589, "doppler_434_khz": -9950, "doppler_144_khz": -3316},
+	{"time_sec": 590, "doppler_434_khz": -9951, "doppler_144_khz": -3316},
+	{"time_sec": 591, "doppler_434_khz": -9952, "doppler_144_khz": -3317},
+	{"time_sec": 592, "doppler_434_khz": -9953, "doppler_144_khz": -3317},
+	{"time_sec": 593, "doppler_434_khz": -9955, "doppler_144_khz": -3318},
+	{"time_sec": 594, "doppler_434_khz": -9956, "doppler_144_khz": -3318},
+	{"time_sec": 595, "doppler_434_khz": -9957, "doppler_144_khz": -3318},
+	{"time_sec": 596, "doppler_434_khz": -9958, "doppler_144_khz": -3319},
+	{"time_sec": 597, "doppler_434_khz": -9960, "doppler_144_khz": -3319},
+	{"time_sec": 598, "doppler_434_khz": -9961, "doppler_144_khz": -3320},
+	{"time_sec": 599, "doppler_434_khz": -9961, "doppler_144_khz": -3320},
+	{"time_sec": 600, "doppler_434_khz": -9962, "doppler_144_khz": -3320},
+	{"time_sec": 601, "doppler_434_khz": -9963, "doppler_144_khz": -3320},
+	{"time_sec": 602, "doppler_434_khz": -9965, "doppler_144_khz": -3321},
+	{"time_sec": 603, "doppler_434_khz": -9965, "doppler_144_khz": -3321},
+	{"time_sec": 604, "doppler_434_khz": -9966, "doppler_144_khz": -3321},
+	{"time_sec": 605, "doppler_434_khz": -9967, "doppler_144_khz": -3322},
+	{"time_sec": 606, "doppler_434_khz": -9968, "doppler_144_khz": -3322},
+	{"time_sec": 607, "doppler_434_khz": -9969, "doppler_144_khz": -3322},
+	{"time_sec": 608, "doppler_434_khz": -9970, "doppler_144_khz": -3323},
+	{"time_sec": 609, "doppler_434_khz": -9970, "doppler_144_khz": -3323},
+	{"time_sec": 610, "doppler_434_khz": -9972, "doppler_144_khz": -3323},
+	{"time_sec": 611, "doppler_434_khz": -9972, "doppler_144_khz": -3323},
+	{"time_sec": 612, "doppler_434_khz": -9973, "doppler_144_khz": -3324},
+	{"time_sec": 613, "doppler_434_khz": -9974, "doppler_144_khz": -3324},
+	{"time_sec": 614, "doppler_434_khz": -9974, "doppler_144_khz": -3324},
+	{"time_sec": 615, "doppler_434_khz": -9975, "doppler_144_khz": -3324},
+	{"time_sec": 616, "doppler_434_khz": -9976, "doppler_144_khz": -3325},
+	{"time_sec": 617, "doppler_434_khz": -9976, "doppler_144_khz": -3325},
+	{"time_sec": 618, "doppler_434_khz": -9977, "doppler_144_khz": -3325},
+	{"time_sec": 619, "doppler_434_khz": -9978, "doppler_144_khz": -3325},
+	{"time_sec": 620, "doppler_434_khz": -9978, "doppler_144_khz": -3325},
+	{"time_sec": 621, "doppler_434_khz": -9979, "doppler_144_khz": -3326},
+	{"time_sec": 622, "doppler_434_khz": -9979, "doppler_144_khz": -3326},
+	{"time_sec": 623, "doppler_434_khz": -9980, "doppler_144_khz": -3326},
+	{"time_sec": 624, "doppler_434_khz": -9981, "doppler_144_khz": -3326},
+	{"time_sec": 625, "doppler_434_khz": -9981, "doppler_144_khz": -3326},
+	{"time_sec": 626, "doppler_434_khz": -9982, "doppler_144_khz": -3327},
+	{"time_sec": 627, "doppler_434_khz": -9982, "doppler_144_khz": -3327},
+	{"time_sec": 628, "doppler_434_khz": -9983, "doppler_144_khz": -3327},
+	{"time_sec": 629, "doppler_434_khz": -9983, "doppler_144_khz": -3327},
+	{"time_sec": 630, "doppler_434_khz": -9984, "doppler_144_khz": -3327},
+	{"time_sec": 631, "doppler_434_khz": -9984, "doppler_144_khz": -3327},
+	{"time_sec": 632, "doppler_434_khz": -9985, "doppler_144_khz": -3328},
+	{"time_sec": 633, "doppler_434_khz": -9985, "doppler_144_khz": -3328},
+	{"time_sec": 634, "doppler_434_khz": -9985, "doppler_144_khz": -3328},
+	{"time_sec": 635, "doppler_434_khz": -9986, "doppler_144_khz": -3328},
+	{"time_sec": 636, "doppler_434_khz": -9986, "doppler_144_khz": -3328},
+	{"time_sec": 637, "doppler_434_khz": -9986, "doppler_144_khz": -3328},
+	{"time_sec": 638, "doppler_434_khz": -9987, "doppler_144_khz": -3328},
+	{"time_sec": 639, "doppler_434_khz": -9987, "doppler_144_khz": -3328},
+	{"time_sec": 640, "doppler_434_khz": -9987, "doppler_144_khz": -3328},
+	{"time_sec": 641, "doppler_434_khz": -9988, "doppler_144_khz": -3329},
+	{"time_sec": 642, "doppler_434_khz": -9988, "doppler_144_khz": -3329},
+	{"time_sec": 643, "doppler_434_khz": -9988, "doppler_144_khz": -3329},
+	{"time_sec": 644, "doppler_434_khz": -9988, "doppler_144_khz": -3329},
+	{"time_sec": 645, "doppler_434_khz": -9988, "doppler_144_khz": -3329},
+	{"time_sec": 646, "doppler_434_khz": -9989, "doppler_144_khz": -3329},
+	{"time_sec": 647, "doppler_434_khz": -9989, "doppler_144_khz": -3329},
+	{"time_sec": 648, "doppler_434_khz": -9989, "doppler_144_khz": -3329},
+	{"time_sec": 649, "doppler_434_khz": -9989, "doppler_144_khz": -3329},
+	{"time_sec": 650, "doppler_434_khz": -9990, "doppler_144_khz": -3329},
+	{"time_sec": 651, "doppler_434_khz": -9990, "doppler_144_khz": -3329},
+	{"time_sec": 652, "doppler_434_khz": -9990, "doppler_144_khz": -3329},
+	{"time_sec": 653, "doppler_434_khz": -9990, "doppler_144_khz": -3329},
+	{"time_sec": 654, "doppler_434_khz": -9990, "doppler_144_khz": -3329},
+	{"time_sec": 655, "doppler_434_khz": -9990, "doppler_144_khz": -3329},
+	{"time_sec": 656, "doppler_434_khz": -9990, "doppler_144_khz": -3329},
+	{"time_sec": 657, "doppler_434_khz": -9990, "doppler_144_khz": -3329},
+	{"time_sec": 658, "doppler_434_khz": -9990, "doppler_144_khz": -3329},
+	{"time_sec": 659, "doppler_434_khz": -9990, "doppler_144_khz": -3329},
+	{"time_sec": 660, "doppler_434_khz": -9990, "doppler_144_khz": -3329},
+	{"time_sec": 661, "doppler_434_khz": -9990, "doppler_144_khz": -3329}
+	]			
+}
+
+try:	
+	tx_value = '0'
+	rx_value = '0'
+	sq = '0'
+	tx = '434.9000'	
+	rx = '435.0000'
+	txr = '144.9000'
+	sim_mode = False
+	sim_config = False
+	doppler_mode = "off"
+	debug_mode = True
+
+	try:
+		file = open("/home/pi/CubeSatSim/.mode")
+		mode = file.read(1)
+	except:
+		mode = 'f'
+		if (debug_mode == 1):
+			print("Can't open .mode file, defaulting to FSK")
+	file.close()
+	print("Mode is: ")
+	print(mode)
+	
+	try:
+		file = open("/home/pi/CubeSatSim/sim.cfg")
+		config = file.readline().split()		
+		if len(config) > 6:
+			txf = float(config[6])
+			tx = "{:.4f}".format(txf)
+#			if (mode == 'e'):
+#				txrf = (txf - 290.0) # - 0.1 # Cross Band Repeater mode transmit frequency in 2m band
+#				txr = "{:.4f}".format(txrf)
+#				print("Transmit frequency: ",txr)
+#			else:
+#				print("Transmit frequency: ",tx)
+			print("Transmit frequency: ",tx)
+		if len(config) > 7:
+			rxf = float(config[7])
+			rx = "{:.4f}".format(rxf)
+			print(rx)
+		if len(config) > 9:
+			rxpl = float(config[9])
+#                       print(rxpl)
+#                       print( "{:.0f}".format(rxpl))
+			rxpl_value = "{:.0f}".format(rxpl)
+			print(rxpl_value)
+		if len(config) > 10:
+			txpl = float(config[10])
+#                        print(txpl)
+#                        print( "{:.0f}".format(txpl))
+			txpl_value = "{:.0f}".format(txpl)
+			print(txpl_value)
+		if len(config) > 13:
+			if config[13] == 'sim':		
+				doppler_mode = 'sim'
+				print("Simulated Doppler frequency shift is enabled.")				
+			elif config[13] == 'rig':	
+				doppler_mode = 'rig'
+				print("rigctl Doppler frequency shift is enabled.")	
+			else:
+				doppler_mode = 'off'
+				print("Doppler frequency shift is disabled.")	
+		else:
+			doppler_mode = 'off'
+			print("Doppler frequency shift is disabled.")	
+		print(config)
+		print
+#		print(callsign)
+		print(sq)
+#		if sq == '8':
+#			print("squelch set to 8, no command input!")
+#			no_command = True
+#		else:
+		no_command = False		
+		print(no_command)
+	except Exception as e:
+		print(f"An error occurred: {e}")		
+		if (debug_mode == 1):
+			print("Can't read sim.cfg file")	
+	file.close()
+		  
+except Exception as e:
+	print(f"An error occurred: {e}")	
+
+if (doppler_mode == 'off'):
+  tx_freq_hz = txf * 1e6
+  rx_freq_hz = rxf * 1e6
+  check_frequency()	
+  print("writing sim.cfg frequency to frequency.txt")	
+  with open("/home/pi/CubeSatSim/frequency.txt", "w") as file:
+      file.write(f"{tx_freq_hz:.0f} {rx_freq_hz:.0f}")
+  while True:
+    sleep(1)
+        
+if (doppler_mode == 'sim'):
+  print("Sim mode")
+	
+#  if (mode == 'e'):
+#    tx_doppler_start_hz = txrf * 1e6
+#  else:
+#    tx_doppler_start_hz = txf * 1e6
+  tx_doppler_start_hz = txf * 1e6	  
+  tx_doppler_shift_hz = 0
+  print(f"Tx center frequency: {tx_doppler_start_hz}")
+  rx_doppler_start_hz = rxf * 1e6
+  rx_doppler_shift_hz = 0
+  print(f"Rx center frequency: {rx_doppler_start_hz}")
+	
+  TARGET_PASS = 88           # Maximum elevation profile
+  doppler_table = iss_doppler_passes[TARGET_PASS]
+  print(f"Pass Max Elevation: {TARGET_PASS}°")
+	
+  start_time = time.perf_counter() 
+  current_index = 0;
+  while True:
+    relative_time = (time.perf_counter() - start_time) 
+#    index = int(relative_time/10) % 37
+    index = int(relative_time) 	  
+    if (index > current_index):
+      current_index = index
+      index = index % 661		
+      print(f"relative time: {relative_time:.1f} seconds after start is AOS index: {index}")
+      table_row = doppler_table[index]
+      rx_doppler_shift_hz = table_row["doppler_434_khz"] # * 1000
+      if (mode == 'e'):
+        tx_doppler_shift_hz = table_row["doppler_144_khz"] # * 1000
+      else:
+        tx_doppler_shift_hz = rx_doppler_shift_hz 
+      tx_doppler_freq_hz = tx_doppler_start_hz + tx_doppler_shift_hz
+      rx_doppler_freq_hz = rx_doppler_start_hz + rx_doppler_shift_hz
+      check_frequency()	
+      print(f"Tx Doppler shift: {tx_doppler_freq_hz:.0f}")		
+      print(f"Rx Doppler shift: {rx_doppler_freq_hz:.0f}")
+
+      with open("/home/pi/CubeSatSim/frequency.txt", "w") as file:
+        file.write(f"{tx_doppler_freq_hz:.0f} {rx_doppler_freq_hz:.0f}")
+    sleep(1)
+
+if (doppler_mode == 'rig'):
+  print("rig mode")
+  while True:
+
+    system("sudo killall -9 ft857d &>/dev/null")
+    system("udo killall -9 socat &>/dev/null")
+    system("sudo killall -9 rigctld &>/dev/null")
+
+    print("Starting virtual serial ports /tmp/vttyA and /tmp/vttyB")
+
+    system("socat -d -d PTY,raw,echo=0,link=/tmp/vttyA PTY,raw,echo=0,link=/tmp/vttyB &")
+
+    sleep(1.0)
+
+    print("Starting CubeSatSim FT857 emulation")
+    system("/home/pi/FT857d/examples/FT857d/ft857d &")
+
+    sleep(1.0)
+
+    print("Starting rigctl emulating FT857 rig using virtual serial port /tmp/vttyB")
+    system("rigctld -m 1022 -r /tmp/vttyB -t 4532 -vvv")
+
+    print("rigctld ended")
+
diff --git a/frequency.sh b/frequency.sh
new file mode 100755
index 00000000..7a81fd07
--- /dev/null
+++ b/frequency.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+echo "Starting frequency control"
+
+python3 /home/pi/CubeSatSim/frequency.py
diff --git a/groundstation/gpredict.sh b/groundstation/gpredict.sh
new file mode 100755
index 00000000..6f926dc8
--- /dev/null
+++ b/groundstation/gpredict.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+#
+
+if [ ! $(systemctl get-default | grep graphical) ]; then
+
+	echo "Graphical User Interface not running!"
+	echo 
+	echo "Do you want to reboot and switch to GUI so you can run Gpredict?"
+	read answer
+
+	if [ "$answer" = "y" ] || [ "$answer" = "yes" ]; then
+		echo "Rebooting!"
+		sudo raspi-config nonint do_boot_behaviour B4
+		sudo reboot now
+	else
+		echo "You can run Gpredict next time you run the GUI."
+		exit
+	fi
+fi
+
+nohup /usr/bin/gpredict </dev/null >/dev/null 2>&1 &
diff --git a/groundstation/pacsat-run.sh b/groundstation/pacsat-run.sh
index 37139874..2c71944f 100755
--- a/groundstation/pacsat-run.sh
+++ b/groundstation/pacsat-run.sh
@@ -15,6 +15,23 @@ sudo killall -9 direwolf &>/dev/null
 
 sudo killall -9 aplay &>/dev/null
 
+if [ ! $(systemctl get-default | grep graphical) ]; then
+
+	echo "Graphical User Interface not running!"
+	echo 
+	echo "Do you want to reboot and switch to GUI so you can run the Pacsat Ground Station"
+	read answer
+
+	if [ "$answer" = "y" ] || [ "$answer" = "yes" ]; then
+		echo "Rebooting!"
+		sudo raspi-config nonint do_boot_behaviour B4
+		sudo reboot now
+	else
+		echo "You can run the Pacsat Ground Station next time you run the GUI."
+		exit
+	fi
+fi
+
 #FILE=/home/pi/.pacsatprofile  
 #if [ ! -f "$FILE" ]; then
 
diff --git a/install b/install
index 44196645..4957dc4e 100755
--- a/install
+++ b/install
@@ -39,7 +39,7 @@ else
 	touch /home/pi/CubeSatSim/command_control_direwolf
 
     echo "creating $FILE"
-    echo "AMSAT 0 0 0 no 3 434.9 435 no 0 0 no 60" > /home/pi/CubeSatSim/sim.cfg
+    echo "AMSAT 0 0 0 no 3 434.9 435 no 0 0 no 60 no" > /home/pi/CubeSatSim/sim.cfg
 
 	/home/pi/CubeSatSim/config -c -n
 
@@ -295,21 +295,22 @@ if [ -f "$FILE" ]; then
 	if [ -z "${11}" ] ; then m2="0" ; changed=1 ; else m2=${11} ; fi # tx pl code
 	if [ -z "${12}" ] ; then m3="no" ; changed=1 ; else m3=${12} ; fi # random fail
 	if [ -z "${13}" ] ; then m4="60" ; changed=1 ; else m4=${13} ; fi # random fail period
+	if [ -z "${14}" ] ; then m5="no" ; changed=1 ; else m5=${14} ; fi # doppler mode
 
 	if [ $changed -eq 1 ]; then
 		echo -e "Current sim.cfg configuration file:"	
 		echo
-		echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13}
+		echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14}
 		echo -e "\nCubeSatSim configuration sim.cfg file updated to: \n"
 		echo
-		echo $n1 $n2 $n3 $n4 $n5 $n6 $n7 $n8 $n9 $m1 $m2 $m3 $m4
-		echo $n1 $n2 $n3 $n4 $n5 $n6 $n7 $n8 $n9 $m1 $m2 $m3 $m4> /home/pi/CubeSatSim/sim.cfg
+		echo $n1 $n2 $n3 $n4 $n5 $n6 $n7 $n8 $n9 $m1 $m2 $m3 $m4 $m5
+		echo $n1 $n2 $n3 $n4 $n5 $n6 $n7 $n8 $n9 $m1 $m2 $m3 $m4 $m5 > /home/pi/CubeSatSim/sim.cfg
 		echo
 	fi
 
 else 
     echo "creating $FILE"
-    echo "AMSAT 0 0 0 no 3 434.9 435 no 0 0 no 60" > /home/pi/CubeSatSim/sim.cfg
+    echo "AMSAT 0 0 0 no 3 434.9 435 no 0 0 no 60 no" > /home/pi/CubeSatSim/sim.cfg
 fi
 
 if [[ $(grep 'cubesatsim' /etc/motd) ]]; then
@@ -343,6 +344,7 @@ sudo apt-get update && sudo apt-get dist-upgrade -y
 # fi
 
 cp /home/pi/CubeSatSim/groundstation/pacsat.desktop /home/pi/Desktop/pacsat.desktop
+cp /home/pi/CubeSatSim/groundstation/gpredict.desktop /home/pi/Desktop/gpredict.desktop
 
 if [ ! -d "/home/pi/venv" ]; then
 
@@ -671,6 +673,13 @@ if [ -f "$FILE" ]; then
   sudo rm /etc/systemd/system/rpitx.service
 fi
 
+if [[ -z $(sudo systemctl is-active packagekit | grep inactive) ]]; then 
+  echo "Removing packagekit so won't auto check for updates on boot"
+  sudo systemctl stop packagekit
+  sudo systemctl disable packagekit
+  sudo apt-get remove -y packagekit
+fi
+
 FILE=/etc/systemd/system/transmit.service
 if [ -f "$FILE" ]; then
   if [[ $(diff /home/pi/CubeSatSim/systemd/transmit.service /etc/systemd/system/transmit.service) ]]; then
@@ -717,6 +726,22 @@ else
   FLAG=1
 fi
 
+FILE=/etc/systemd/system/frequency.service
+if [ -f "$FILE" ]; then
+  if [[ $(diff /home/pi/CubeSatSim/systemd/frequency.service /etc/systemd/system/frequency.service) ]]; then
+    echo "changed frequency.service."
+    sudo cp /home/pi/CubeSatSim/systemd/frequency.service /etc/systemd/system/frequency.service
+    FLAG=1
+  else
+    echo "no change to frequency.service."
+  fi
+else
+  echo "creating frequency.service."
+  sudo cp /home/pi/CubeSatSim/systemd/frequency.service /etc/systemd/system/frequency.service
+  FLAG=1
+fi
+
+
 FILE=/etc/asound.conf
 if [ -f "$FILE" ]; then
   if [[ $(diff /home/pi/CubeSatSim/asound.conf /etc/asound.conf) ]]; then
@@ -833,6 +858,30 @@ if [ ! -f "/home/pi/ssdv/ssdv" ]; then
 	make
 fi
 
+if [ ! -f "/home/pi/FT857d/examples/FT857d/ft857d" ]; then
+	cd
+	echo "Installing FT857d for Doppler rigctld control mode"
+	git clone https://github.com/alanbjohnston/FT857d.git
+	cd FT857d
+	git checkout pi	
+	cd examples/FT857d	
+	g++ main.c ../../src/ft857d.cpp -lwiringPi -o ft857d
+
+	sudo apt-get install -y libhamlib-utils socat gpredict
+fi
+
+cd /home/pi/FT857d
+git checkout pi
+git pull --no-rebase > .updated_p
+
+if [[ $(grep 'changed' //home/pi/FT857d/.updated_p) ]]; then
+	echo "updating FT857d"
+	cd examples/FT857d	
+	g++ main.c ../../src/ft857d.cpp -lwiringPi -o ft857d
+else
+	echo "nothing to do for FT857d."
+fi 
+
 cd
 
 #echo "Would you like to reboot to complete the installation (y/n)?"
@@ -851,6 +900,15 @@ cd
 
 sed -i 's/quick_exec=0/quick_exec=1/' ~/.config/libfm/libfm.conf
 
+if [ ! -d "/home/pi/Icons" ]; then
+	cd
+	mkdir Icons
+	cd Icons
+	#wget http://cubesatsim.org/icons/*
+	#wget -r -nd --no-parent -A 'bar.*.tar.gz' http://url/dir/
+	wget -r -nd --no-parent -A '*' https://cubesatsim.org/icons/
+fi
+
 sudo apt install -y raspberrypi-ui-mods 
 
 sudo apt autoremove -y
diff --git a/log b/log
index a516a3c0..c4017153 100755
--- a/log
+++ b/log
@@ -8,6 +8,8 @@ if [ "$1" = "-h" ]  ; then
   echo " -t transmit"
   echo " -c command and control"
   echo " -p pacsat"
+  echo " -r frequency control"
+  echo " -f frequency display"
   echo "Default is the log is dumpted to the screen and written to a file."
   echo "If an additional r is included, the log is realtime, and exits with a Control-C"
   echo
@@ -25,7 +27,7 @@ if [ "$REALTIME" = "1" ]  ; then
   echo
   sleep 2
   
-  if [ "$1" = "-r" ] || [ "$1" = "-t" ] ; then
+  if [ "$1" = "-t" ] ; then
     sudo journalctl -af -u transmit # > /home/pi/CubeSatSim/logt.txt 
   #  cat /home/pi/CubeSatSim/logt.txt
   #  echo -e "\nTransmit Log file also saved as /home/pi/CubeSatSim/logt.txt"
@@ -37,6 +39,15 @@ if [ "$REALTIME" = "1" ]  ; then
     sudo journalctl -af -u pacsatsim # > /home/pi/CubeSatSim/logp.txt 
     cat /home/pi/CubeSatSim/logp.txt
   #  echo -e "\nCommand and Control Log file also saved as /home/pi/CubeSatSim/logp.txt"
+  elif [ "$1" = "-r" ]; then
+    sudo journalctl -af -u frequency # > /home/pi/CubeSatSim/logr.txt 
+  elif [ "$1" = "-f" ] ; then
+    while true; do 
+      cat /home/pi/CubeSatSim/frequency.txt | tr -d '\n'
+#      echo
+      sleep 1
+      printf "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b"
+    done
   else
     sudo journalctl -af -u cubesatsim  # > /home/pi/CubeSatSim/log.txt 
   #  cat /home/pi/CubeSatSim/log.txt
@@ -45,7 +56,7 @@ if [ "$REALTIME" = "1" ]  ; then
 
 else
   
-  if [ "$1" = "-r" ] || [ "$1" = "-t" ] ; then
+  if [ "$1" = "-t" ] ; then
     sudo journalctl -a -u transmit > /home/pi/CubeSatSim/logt.txt 
     cat /home/pi/CubeSatSim/logt.txt
     echo -e "\nTransmit Log file also saved as /home/pi/CubeSatSim/logt.txt"
@@ -57,6 +68,13 @@ else
     sudo journalctl -a -u pacsatsim > /home/pi/CubeSatSim/logp.txt 
     cat /home/pi/CubeSatSim/logp.txt
     echo -e "\nCommand and Control Log file also saved as /home/pi/CubeSatSim/logp.txt"
+  elif [ "$1" = "-r" ]; then
+    sudo journalctl -a -u frequency > /home/pi/CubeSatSim/logr.txt 
+    cat /home/pi/CubeSatSim/logr.txt
+    echo -e "\nFrequency Log file also saved as /home/pi/CubeSatSim/logf.txt"
+  elif [ "$1" = "-f" ] ; then
+    cat /home/pi/CubeSatSim/frequency.txt
+    echo
   else
     sudo journalctl -a -u cubesatsim  > /home/pi/CubeSatSim/log.txt 
     cat /home/pi/CubeSatSim/log.txt
diff --git a/main.c b/main.c
index 3152e021..08478b4a 100644
--- a/main.c
+++ b/main.c
@@ -42,11 +42,11 @@ int main(int argc, char * argv[]) {
 
 //  char * cfg_buf[100];
 
-  fscanf(config_file, "%s %d %f %f %s %d %s %s %s %d %d %s %d", 
-	  call, &reset_count, &lat_file, &long_file, sim_yes, &squelch, tx, rx, hab_yes, &rx_pl, &tx_pl, fail_yes, &fail_time);
+  fscanf(config_file, "%s %d %f %f %s %d %s %s %s %d %d %s %d %s", 
+	  call, &reset_count, &lat_file, &long_file, sim_yes, &squelch, tx, rx, hab_yes, &rx_pl, &tx_pl, fail_yes, &fail_time, doppler_mode);
   fclose(config_file);
-  fprintf(stderr,"Config file /home/pi/CubeSatSim/sim.cfg contains %s %d %f %f %s %d %s %s %s %d %d %s %d\n", 
-	  call, reset_count, lat_file, long_file, sim_yes, squelch, tx, rx, hab_yes, rx_pl, tx_pl, fail_yes, fail_time);
+  fprintf(stderr,"Config file /home/pi/CubeSatSim/sim.cfg contains %s %d %f %f %s %d %s %s %s %d %d %s %d %s\n", 
+	  call, reset_count, lat_file, long_file, sim_yes, squelch, tx, rx, hab_yes, rx_pl, tx_pl, fail_yes, fail_time, doppler_mode);
 
   fprintf(stderr, "Transmit on %s MHz Receive on %s MHz\n", tx, rx);
 
@@ -321,8 +321,8 @@ int main(int argc, char * argv[]) {
   }
 
   config_file = fopen("sim.cfg", "w");
-  fprintf(config_file, "%s %d %8.4f %8.4f %s %d %s %s %s %d %d %s %d", 
-	  call, reset_count, lat_file, long_file, sim_yes, squelch, tx, rx, hab_yes, rx_pl, tx_pl, fail_yes, fail_time);
+  fprintf(config_file, "%s %d %8.4f %8.4f %s %d %s %s %s %d %d %s %d %s", 
+	  call, reset_count, lat_file, long_file, sim_yes, squelch, tx, rx, hab_yes, rx_pl, tx_pl, fail_yes, fail_time, doppler_mode);
   //    fprintf(config_file, "%s %d", call, reset_count);
   fclose(config_file);
   config_file = fopen("sim.cfg", "r");
diff --git a/main.h b/main.h
index 08a9ad5e..60e534b8 100644
--- a/main.h
+++ b/main.h
@@ -170,6 +170,7 @@ char sim_yes[10];
 char hab_yes[10];
 char fail_yes[10];
 int fail_time = 60;
+char doppler_mode[10];
 int squelch = 3; // default squelch
 char rx[12], tx[12];
 int tx_pl = 0;
diff --git a/systemd/frequency.service b/systemd/frequency.service
new file mode 100644
index 00000000..03ecb550
--- /dev/null
+++ b/systemd/frequency.service
@@ -0,0 +1,14 @@
+[Unit]
+Description=frequency
+
+[Service]
+TimeoutStopSec=5
+ExecStart=python3 -u /home/pi/CubeSatSim/frequency.py
+WorkingDirectory=/home/pi/CubeSatSim
+StandardOutput=inherit
+StandardError=inherit
+Restart=always
+User=pi
+
+[Install]
+WantedBy=default.target
diff --git a/transmit.py b/transmit.py
index 75f59de0..3a4448e7 100644
--- a/transmit.py
+++ b/transmit.py
@@ -17,6 +17,20 @@ def output(pin, value):
 	system(command)
 	print(command)
 
+def uptime_seconds():
+	try:
+		system("sudo cat /proc/uptime > /home/pi/CubeSatSim/uptime")
+		file = open("/home/pi/CubeSatSim/uptime")
+		up = file.read().split(" ")[0]
+		print(up)
+		uptime = float(up)
+		print(uptime)
+		file.close() 
+		return uptime		
+	except Exception as e:
+		print(f"An error occurred: {e}")	
+		print(" failed") 
+
 def input(pin):
 	# command = "gpio -g read " + str(pin)
 	query = ["gpio", "-g", "read", str(pin)] # Read GPIO pin
@@ -216,15 +230,325 @@ def camera_photo():
 		return True
 	else:
 		return False
+
+def program_fm(rx, tx, rxpl_value, sq, txpl_value):
+
+	try:
+		global gpsd_status
+		global pd
+		global ptt
+		global two_meter_rpitx
+		global txc
+		global restore_txc
+		
+		if (gpsd_status == "active"):
+			print("Stopping gpsd.socket")
+			system("sudo systemctl stop gpsd.socket")
+		print("Programming FM module!\n");
+		txf = float(tx)
+		rxf = float(rx)
+		
+		if (txf > 144.0) and (txf < 148.0):
+			two_meter_rpitx = True
+			print("Transmitting in 2m band using rptix")
+#			if (txc):
+#				restore_txc = True
+#				print("Restore FM with 70cm band")
+			txc = False
+			tx = "434.9000"
+#		elif (two_meter_rpitx):
+#			two_meter_rpitx = False
+#			print("Stop transmitting in 2m bacnd using rptix")
+#			if (restore_txc):
+#				txc = True
+#				restore_txc = False
+#				print("Restoring FM with 70cm band")
+#				print("Rebooting")
+#				system("sudo reboot now")
+			
+		if (txf > 450.0) or ((txf < 420.0) and (txf > 148.0)) or (txf < 144.0) :
+			tx = "434.9000"
+			print("Transmit frequency out of amateur bands")
 		
+		if (rxf > 450.0) or (rxf < 420.0):
+			rx = "435.0000"		
+			print("Receive frequency out of FM bounds")
+		output(pd, 1)
+		output (ptt, 1)
+		try:
+			ser = serial.Serial("/dev/ttyAMA0", 9600)
+			print(ser.portstr)
+		#		uhf_string = "AT+DMOSETGROUP=0," + rx +"," + tx + ",0,3,0,0\r\n"
+			uhf_string = "AT+DMOSETGROUP=0," + rx + "," + tx + "," + rxpl_value + "," + sq + "," + txpl_value + ",0\r\n"
+			print(uhf_string)
+			for i in range(6):
+		#			ser.write(b"AT+DMOSETGROUP=0,435.0000,434.9000,0,3,0,0\r\n")
+				ser.write(uhf_string.encode())
+				sleep(0.1)
+			ser.close()
+			ser = serial.Serial("/dev/ttyAMA0", 115200) # reset back to 115200 for cubesatsim code for payload sensor data
+		except Exception as e:
+			print(f"An error occurred: {e}")	
+			print("Error in serial write")
+	#	output(pd, 0)  # Don't turn off receiver
+		if (gpsd_status == "active"):
+			print("Restarting gpsd.socket")
+			system("sudo systemctl restart gpsd.socket")
+	except Exception as e:
+		print(f"An error occurred: {e}")
+		print("program_fm failed")
+
+def start_repeater(tx_freq_hz, rx_freq_hz):
+	global txLed
+	print("Starting repeater")
+
+	if abs(rx_freq_hz - 3 * tx_freq_hz) < 10000: 
+		tx_freq_hz = tx_freq_hz + 30000
+		print("Adjusting Repeater TX frequency to avoid 3rd harmonic RX")
+	
+	output(txLed, 1)
+	txr = "{:.3f}".format(tx_freq_hz/1e3)
+	print(txr)
+	system("sudo nc -l 8011 | csdr convert_i16_f | csdr gain_ff 4000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f " + txr + " > /dev/null 2>&1 &")
+	sleep(0.5)
+	system("sudo arecord -D shared_mic -r48000 -fS16_LE -c1 | nc localhost 8011 &")
+
+def stop_repeater():
+	global txLed
+#	print("No carrier detected, stopping repeater")
+	output(txLed, 0)
+	system("sudo rpitx -i null > /dev/null 2>&1")
+	system("sudo killall -9 arecord > /dev/null 2>&1")
+	system("sudo killall -9 nc > /dev/null 2>&1")
+#	system("sudo killall -9 rpitx > /dev/null 2>&1")
+	print("Resetting audio")
+	system("sudo /etc/init.d/alsa-utils stop")
+	system("sudo /etc/init.d/alsa-utils start")
+	print("Finished resetting audio")
+#	print("Ready to detect carrier")
+
+def update_doppler(fm="yes"):
+
+	try:
+		global start_time
+		global tx_doppler_freq_hz
+		global rx_doppler_freq_hz
+		global rxpl_value
+		global txpl_value
+		global sq
+		global mode
+		global tx
+		global rxf
+		global txr
+		global rigctl
+		print("update_doppler")
+
+		with open("/home/pi/CubeSatSim/frequency.txt", "r") as file:
+			frequencies = file.read().split()
+		
+		tx_frequency = int(frequencies[0])
+		rx_frequency = int(frequencies[1])  # Not used right now as FT857 emulation only updates transmit frequency
+
+		print(f"New TX Frequency: {tx_frequency}, new RX Frequency: {rx_frequency}")
+
+		if rigctl:
+			if (tx_frequency > 145955000) and (tx_frequency <= 145965000):
+				tx_center = 145960000 # AO-91
+				rx_center = 435250000 
+				print("AO-91 detected!")
+			elif (tx_frequency > 145965000) and (tx_frequency < 145975000):
+				tx_center = 145970000 # AO-73 is shifted up 10kHz to avoid overlap with AO-91
+				rx_center = 435140000 
+				print("AO-73 detected!")				
+			elif (tx_frequency > 145795000) and (tx_frequency < 145805000):	
+				tx_center = 145800000 # ISS U/V Repeater
+				rx_center = 437800000 
+				print("ISS U/V detected!")				
+			elif (tx_frequency > 145945000) and (tx_frequency <= 145955000):	
+				tx_center = 145950000 # AO-7
+				rx_center = 432150000 	
+				print("AO-7 detected!")				
+			else:
+				tx_center = tx_frequency
+				rx_center = rxf * 1e6 # default RX requency	
+				print("No Satellite detected.  Using default RX frequency with no doppler shift")				
+
+			if (rx_center != rxf * 1e6):	# don't Doppler shift default RX frequency since don't know the shift 
+				tx_doppler_shift = tx_frequency - tx_center
+				rx_doppler_shift = -1 * (rx_center/tx_center) * tx_doppler_shift
+				new_tx_frequency = tx_frequency
+				new_rx_frequency = rx_center + rx_doppler_shift
+				print("Calculating RX frequency using offset from TX frequency!")
+				print(f"Tx Doppler Shift: {tx_doppler_shift:.0f}  Frequency: {new_tx_frequency:.0f}")
+				print(f"Rx Doppler Shift: {rx_doppler_shift:.0f}  Frequency: {new_rx_frequency:.0f}")
+			else:
+				new_tx_frequency = tx_frequency
+				new_rx_frequency = rxf * 1e6 # default RX frequency or should we use same as tx frequency with doppler shift?
+				print(f"Tx Frequency: {new_tx_frequency:.0f}")
+				print(f"Rx Frequency: {new_rx_frequency:.0f}")
+		else:
+			new_tx_frequency = tx_frequency
+			new_rx_frequency = rx_frequency
+			print(f"Tx Frequency: {new_tx_frequency:.0f}")
+			print(f"Rx Frequency: {new_rx_frequency:.0f}")			
+		
+		if (tx_doppler_freq_hz != new_tx_frequency) or (rx_doppler_freq_hz != new_rx_frequency):
+			tx_doppler_freq_hz = new_tx_frequency
+			rx_doppler_freq_hz = new_rx_frequency
+			print("Applying Doppler shift!")
+#			print(f"Tx Doppler shift: {tx_doppler_freq_hz:.0f}")
+#			rx_doppler_freq_hz = rx_doppler_start_hz + rx_doppler_shift_hz
+#			print(f"Tx Doppler shift: {tx_doppler_freq_hz:.0f}")
+			rx = "{:.4f}".format(rx_doppler_freq_hz/1e6)
+			if (mode != 'e'):
+				tx = "{:.4f}".format(tx_doppler_freq_hz/1e6)
+#					print(tx)
+			else:
+				txr = "{:.3f}".format(tx_doppler_freq_hz/1e6)
+			if (fm != "no"):
+				program_fm(rx,tx,rxpl_value,sq,txpl_value)
+		else:
+			print("Not applying Doppler shift!")
+	except Exception as e:
+		print(f"An error occurred: {e}")	
+		print("update_doppler failed")
+
+morse_table = [  # 0-9, A-Z only by (ASCII - 48)
+  [ 3, 3, 3, 3, 3, 0 ],	# 0		
+  [ 1, 3, 3, 3, 3, 0 ],	# 1		
+  [ 1, 1, 3, 3, 3, 0 ],	# 2		
+  [ 1, 1, 1, 3, 3, 0 ],	# 3	
+  [ 1, 1, 1, 1, 3, 0 ],	# 4
+  [ 1, 1, 1, 1, 1, 0 ],	# 5		
+  [ 3, 1, 1, 1, 1, 0 ],	# 6		
+  [ 3, 3, 1, 1, 1, 0 ],	# 7		
+  [ 3, 3, 3, 1, 1, 0 ],	# 8	
+  [ 3, 3, 3, 3, 1, 0 ],	# 9	
+  [ 0, 0, 0, 0, 0, 0 ],	# -		   
+  [ 0, 0, 0, 0, 0, 0 ],	# -		
+  [ 0, 0, 0, 0, 0, 0 ],	# -		   
+  [ 0, 0, 0, 0, 0, 0 ],	# -		   
+  [ 0, 0, 0, 0, 0, 0 ],	# -		   
+  [ 0, 0, 0, 0, 0, 0 ],	# -		
+  [ 0, 0, 0, 0, 0, 0 ],	# -		  
+  [ 1, 3, 0, 0, 0, 0 ],	# A
+  [ 3, 1, 1, 1, 0, 0 ],	# B
+  [ 3, 1, 3, 1, 0, 0 ],	# C	
+  [ 3, 1, 1, 0, 0, 0 ],	# D	
+  [ 1, 0, 0, 0, 0, 0 ],	# E		
+  [ 1, 1, 3, 1, 0, 0 ],	# F		
+  [ 3, 3, 1, 0, 0, 0 ],	# G	
+  [ 1, 1, 1, 1, 0, 0 ],	# H	
+  [ 1, 1, 0, 0, 0, 0 ],	# I	
+  [ 1, 3, 3, 3, 0, 0 ],	# J		
+  [ 3, 1, 3, 0, 0, 0 ],	# K	
+  [ 1, 3, 1, 1, 0, 0 ],	# L
+  [ 3, 3, 0, 0, 0, 0 ],	# M		
+  [ 3, 1, 0, 0, 0, 0 ],	# N	
+  [ 3, 3, 3, 0, 0, 0 ],	# O
+  [ 1, 3, 3, 1, 0, 0 ],	# P
+  [ 3, 3, 1, 3, 0, 0 ],	# Q
+  [ 1, 3, 1, 0, 0, 0 ],	# R	
+  [ 1, 1, 1, 0, 0, 0 ],	# S		
+  [ 3, 0, 0, 0, 0, 0 ],	# T		
+  [ 1, 1, 3, 0, 0, 0 ],	# U		
+  [ 1, 1, 1, 3, 0, 0 ],	# V		
+  [ 1, 3, 3, 0, 0, 0 ],	# W		
+  [ 3, 1, 1, 3, 0, 0 ],	# X		
+  [ 3, 1, 3, 3, 0, 0 ],	# Y	
+  [ 3, 3, 1, 1, 0, 0 ]	# Z	
+]
+
+def cw_transmit_fm(morse, tx):
+	global txLed
+#	global no_command
+	global debug_mode
+#	global sim_mode
+#	global callsign
+#	global tx
+#	global txr
+	
+	try:	
+		output(txLed, 1)
+		print("Transmit FM CW " + morse)
+#		status = ""
+#		if not no_command:
+#			status = status + " C"
+#		if sim_mode:
+#			status = status + " S"
+#		if (mode != 'e'):	
+		if (debug_mode == 1):
+			system("echo 'hi hi de " + morse + "' > id.txt && gen_packets -M 20 /home/pi/CubeSatSim/id.txt -o /home/pi/CubeSatSim/morse.wav -r 48000 > /dev/null 2>&1 && cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + tx + "e3")
+		else:
+			system("echo 'hi hi de " + morse + "' > id.txt && gen_packets -M 20 /home/pi/CubeSatSim/id.txt -o /home/pi/CubeSatSim/morse.wav -r 48000 > /dev/null 2>&1 && cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + tx + "e3 > /dev/null 2>&1")
+#		else:
+#			if (debug_mode == 1):
+#				system("echo 'hi hi de " + morse + "' > id.txt && gen_packets -M 20 /home/pi/CubeSatSim/id.txt -o /home/pi/CubeSatSim/morse.wav -r 48000 > /dev/null 2>&1 && cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + txr + "e3")
+#			else:
+#				system("echo 'hi hi de " + morse + "' > id.txt && gen_packets -M 20 /home/pi/CubeSatSim/id.txt -o /home/pi/CubeSatSim/morse.wav -r 48000 > /dev/null 2>&1 && cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + txr + "e3 > /dev/null 2>&1")
+			
+		output(txLed, 0)
+	except Exception as e:
+		print(f"An error occurred: {e}")	
+		print("cw_transmit_fm failed")	
+	
+def cw_transmit_string(string):
+	global morse_timing
+	for character in string: 	
+		if (character != ' '):
+			update_doppler()
+			cw_transmit_char(character);
+		else:
+			sleep(7.0 * morse_timing);
+	
+def cw_transmit_char(character): 	
+	global morse_timing
+#	update_doppler("no")
+	i = 0
+	duration = morse_table[(ord(character.upper()) - ord('0')) % 44][i]
+	if duration == 1:
+		duration = 1.2
+#	print(duration)
+	while (duration != 0): 
+		transmit_carrier(duration * morse_timing)	  
+		sleep(morse_timing * 0.4)  # 6)
+		i=i+1
+		duration = morse_table[(ord(character.upper()) - ord('0')) % 44][i]
+		if duration == 1:
+			duration = 1.2
+	sleep(morse_timing * 2.0) # 3) # 1.5);
+
+def transmit_carrier(duration):
+	global tx_doppler_freq_hz
+	global txLed
+	update_doppler("no")
+	command = "timeout -k 0.5 " + str(duration) + " sudo tune -f " + str(tx_doppler_freq_hz) + " > /dev/null 2>&1" # 434.9e6
+	start = "sudo tune -f " + str(tx_doppler_freq_hz) + " &" # + " & > /dev/null 2>&1" # 434.9e6
+	stop = "sudo rpitx -f 434.9e6 &"
+#	killrpitx = "sudo killall -9 rpitx &"
+	killtune = "sudo killall -9 tune &"
+	output(txLed, 1)
+#	system(start)
+	system(command)
+#	sleep(duration)
+#	system(stop)
+	output(txLed, 0)
+#	system(killrpitx)
+#	system(killtune)
+
 print("CubeSatSim v2.2 transmit.py starting...")
 
+system("sudo systemctl restart frequency")
+
 pd = 21
 ptt = 20
 txc_pin = 7
 squelch = 6
 green = 16
 powerPin = 16
+morse_timing = 0.09 # 0.1
+two_meter_rpitx = False
+restore_txc = False
 
 command_tx = True
 
@@ -272,6 +596,9 @@ debug_mode = 0  # change to 1 to debug transmit
 
 skip = False
 
+tx_doppler_freq_hz = 0
+rx_doppler_freq_hz = 0
+
 if __name__ == "__main__":
 	mode = "y"
 	if (len(sys.argv)) > 1:
@@ -296,22 +623,22 @@ if __name__ == "__main__":
 	except:
 		print("Pi Zero 2 not detected")
 
-	try:
-		system("sudo cat /proc/uptime > /home/pi/CubeSatSim/uptime")
-		file = open("/home/pi/CubeSatSim/uptime")
-		up = file.read().split(" ")[0]
-		print(up)
-		uptime = float(up)
-		print(uptime)
-		if (uptime < uptime_time):
-			print("Uptime < threshold seconds")
-		else:
-			print("Uptime > threshold seconds")
-			print("Skip CW ID")
-			skip = True
-		file.close() 
-	except:
-		print("Can't open /proc/uptime") 
+#	try:
+#		system("sudo cat /proc/uptime > /home/pi/CubeSatSim/uptime")
+#		file = open("/home/pi/CubeSatSim/uptime")
+#		up = file.read().split(" ")[0]
+#		print(up)
+#		uptime = float(up)
+#		print(uptime)
+	if (uptime_seconds() < uptime_time):
+		print("Uptime < threshold seconds")
+	else:
+		print("Uptime > threshold seconds")
+		print("Skip CW ID")
+		skip = True
+#		file.close() 
+#	except:
+#		print("Can't open /proc/uptime") 
 	print(skip)	
 
 	if ( mode == "y"):
@@ -363,6 +690,8 @@ if __name__ == "__main__":
 	sim_mode = False
 	sim_config = False
 	hab_mode = False
+	doppler_mode = False
+	rigctl = False
 	
 	try:
 		file = open("/home/pi/CubeSatSim/sim.cfg")
@@ -389,34 +718,55 @@ if __name__ == "__main__":
 			print(f'squelch: {sq}')
 		if len(config) > 6:
 			txf = float(config[6])
+			tx = "{:.4f}".format(txf)
+			txrf = 0
 			if (mode == 'e'):
-				txr = (txf - 290.0) # - 0.1 # Cross Band Repeater mode transmit frequency in 2m band
-				tx = "{:.4f}".format(txr)
+				if (txf > 420.0) and (txf < 450.0):
+					txrf = (txf - 290.0) # - 0.1 # Cross Band Repeater mode transmit frequency in 2m band
+					print("Repeater mode subtracting 290 MHz from TX Frequency")
+				elif (txf > 144.0) and (txf < 148.0):	
+					txrf = txf # Cross Band Repeater mode transmit frequency is already in 2m band
+					print("Repeater mode using 2m TX Frequency")
+				else:
+					txf = 144.9
+				txr = "{:.4f}".format(txrf)
+				print("Transmit frequency: ",txr)
 			else:
-				tx = "{:.4f}".format(txf)
-			print("Transmit frequency: ",tx)
+				print("Transmit frequency: ",tx)
 		if len(config) > 7:
-                        rxf = float(config[7])
-#                        print(rxf)
-#                        print( "{:.4f}".format(rxf))
-                        rx = "{:.4f}".format(rxf)
-                        print(rx)
+			rxf = float(config[7])
+			rx = "{:.4f}".format(rxf)
+			print(rx)
 		if len(config) > 8:
 			if config[8] == 'y' or config[8] == 'yes':		
 				hab_mode = True
 				print("Balloon (HAB) mode is configured.")				
 		if len(config) > 9:
-                        rxpl = float(config[9])
- #                       print(rxpl)
- #                       print( "{:.0f}".format(rxpl))
-                        rxpl_value = "{:.0f}".format(rxpl)
-                        print(rxpl_value)
+			rxpl = float(config[9])
+#                       print(rxpl)
+#                       print( "{:.0f}".format(rxpl))
+			rxpl_value = "{:.0f}".format(rxpl)
+			print(rxpl_value)
 		if len(config) > 10:
-                        txpl = float(config[10])
+			txpl = float(config[10])
 #                        print(txpl)
 #                        print( "{:.0f}".format(txpl))
-                        txpl_value = "{:.0f}".format(txpl)
-                        print(txpl_value)			
+			txpl_value = "{:.0f}".format(txpl)
+			print(txpl_value)
+		if len(config) > 13:
+			if config[13] == 'sim':		
+				doppler_mode = True
+#				system("sudo systemctl restart frequency")
+				print("Simulated Doppler frequency shift is enabled.")				
+			elif config[13] == 'rig':	
+				doppler_mode = True
+				rigctl = True
+#				system("sudo systemctl restart frequency")
+				print("rigctl Doppler frequency shift is enabled.")	
+#			else:
+#				system("sudo systemctl stop rigctld")
+		else:
+			system("sudo systemctl stop rigctld")
 		print(config)
 		print
 #		print(callsign)
@@ -488,50 +838,77 @@ if __name__ == "__main__":
 		print(f"Output of the command (stdout): {e.stdout}")
 #		print(f"Error output of the command (stderr): {e.stderr}")
   	
-	if (mode != 'e'): 
-		
-		if (gpsd_status == "active"):
-			print("Stopping gpsd.socket")
-			system("sudo systemctl stop gpsd.socket")
-		print("Programming FM module!\n");	
-		output(pd, 1)
-		output (ptt, 1)
-		try:
-			ser = serial.Serial("/dev/ttyAMA0", 9600)
-			print(ser.portstr)
-	#		uhf_string = "AT+DMOSETGROUP=0," + rx +"," + tx + ",0,3,0,0\r\n"
-			uhf_string = "AT+DMOSETGROUP=0," + rx + "," + tx + "," + rxpl_value + "," + sq + "," + txpl_value + ",0\r\n"
-			print(uhf_string)
-			for i in range(6):
-	#			ser.write(b"AT+DMOSETGROUP=0,435.0000,434.9000,0,3,0,0\r\n")
-				ser.write(uhf_string.encode())
-				sleep(0.1)
-			ser.close()
-			ser = serial.Serial("/dev/ttyAMA0", 115200) # reset back to 115200 for cubesatsim code for payload sensor data
-		except:
-			print("Error in serial write")
-		output(pd, 0)
-		if (gpsd_status == "active"):
-			print("Restarting gpsd.socket")
-			system("sudo systemctl restart gpsd.socket")
+#	if (mode != 'e'): 
+	program_fm(rx,tx,rxpl_value,sq,txpl_value)	
+
+	if ((doppler_mode == True) and (command_tx == True) and (skip == False)) or (mode == 'e'):
+		cw_transmit_fm("QSY", tx)
+	
+	if (doppler_mode == True):	
+
+#		if (command_tx == True) and (skip == False):
+#			cw_transmit_fm("QSY", tx)
 			
+		if (mode == 'e'):
+			tx_doppler_start_hz = txrf * 1e6
+		else:
+			tx_doppler_start_hz = txf * 1e6
+		tx_doppler_shift_hz = 0
+		print(f"Tx center frequency: {tx_doppler_start_hz}")
+		rx_doppler_start_hz = rxf * 1e6
+		rx_doppler_shift_hz = 0
+		print(f"Rx center frequency: {rx_doppler_start_hz}")
+
+#		TARGET_PASS = 85           # Maximum elevation profile
+	
+#		doppler_table = iss_doppler_passes[TARGET_PASS]
+#		print(f"Pass Max Elevation: {TARGET_PASS}°")
+
+		print("MODE: ")
+		print(mode)
+
+		update_doppler()
+		if (mode == 'm') and (skip == False):
+			print("Sleeping 15 seconds")
+			sleep(15) # avoid CW jumping around at start
+
+			result = subprocess.run("systemctl get-default | grep graphical.target", shell=True, capture_output=True, text=True)
+			gui_result = result.stdout.strip()
+			print(gui_result)  
+			if gui_result == "graphical.target":
+				print("Sleep another 30 seconds")
+				sleep(30)  # sleep another 30 seconds for cpu to settle down
+		
 	sim_failure_check()
+
+	status = ""
+	if not no_command:
+		status = status + " C"
+	if sim_mode:
+		status = status + " S"
+	
 	if (hab_mode == True) and (mode == 'a'):
 		print("Don't transmit CW ID since APRS HAB mode is active")
 	else:	
 		if (((mode == 'a') or (mode == 'b') or (mode == 'f') or (mode == 's') or (mode == 'j') or (mode == 'p') or (mode == 'P')) and (command_tx == True) and (skip == False)) or ((mode == 'e') and (command_tx == True)):	#		battery_saver_mode
-			output(txLed, 1)
-			print("Transmit CW ID")
-			status = ""
-			if not no_command:
-				status = status + " C"
-			if sim_mode:
-				status = status + " S"
-			if (debug_mode == 1):
-				system("echo 'hi hi de " + callsign + status + "' > id.txt && gen_packets -M 20 /home/pi/CubeSatSim/id.txt -o /home/pi/CubeSatSim/morse.wav -r 48000 > /dev/null 2>&1 && cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + tx + "e3")
+			
+#			output(txLed, 1)
+#			print("Transmit CW ID")
+
+			if (mode != 'e'):
+				cw_transmit_fm(callsign + status, tx)
+#				if (debug_mode == 1):
+#					system("echo 'hi hi de " + callsign + status + "' > id.txt && gen_packets -M 20 /home/pi/CubeSatSim/id.txt -o /home/pi/CubeSatSim/morse.wav -r 48000 > /dev/null 2>&1 && cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + tx + "e3")
+#				else:
+#					system("echo 'hi hi de " + callsign + status + "' > id.txt && gen_packets -M 20 /home/pi/CubeSatSim/id.txt -o /home/pi/CubeSatSim/morse.wav -r 48000 > /dev/null 2>&1 && cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + tx + "e3 > /dev/null 2>&1")
 			else:
-				system("echo 'hi hi de " + callsign + status + "' > id.txt && gen_packets -M 20 /home/pi/CubeSatSim/id.txt -o /home/pi/CubeSatSim/morse.wav -r 48000 > /dev/null 2>&1 && cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + tx + "e3 > /dev/null 2>&1")
-			output(txLed, 0)
+				cw_transmit_fm(callsign + status, txr)
+#				if (debug_mode == 1):
+#					system("echo 'hi hi de " + callsign + status + "' > id.txt && gen_packets -M 20 /home/pi/CubeSatSim/id.txt -o /home/pi/CubeSatSim/morse.wav -r 48000 > /dev/null 2>&1 && cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + txr + "e3")
+#				else:
+#					system("echo 'hi hi de " + callsign + status + "' > id.txt && gen_packets -M 20 /home/pi/CubeSatSim/id.txt -o /home/pi/CubeSatSim/morse.wav -r 48000 > /dev/null 2>&1 && cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + txr + "e3 > /dev/null 2>&1")
+#				
+#			output(txLed, 0)
 	
 			sleep(1)
 		else:
@@ -560,12 +937,13 @@ if __name__ == "__main__":
 				output(txLed, 0)
 				print("0")
 				rpitx = "arecord -D plughw:CARD=Loopback,DEV=1 -f S16_LE -r 48000 -c 1 | csdr convert_s16_f | csdr gain_ff 4000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f " + tx + "e3 > /dev/null 2>&1 &"
-				stop_rpitx = "sudo killall -9 rpitx && sudo killall -9 arecord && sudo rpitx -m RF -f 434.9e3 > /dev/null 2>&1"
+#				stop_rpitx = "sudo killall -9 rpitx && sudo killall -9 arecord && sudo rpitx -m RF -f  434.9e3 > /dev/null 2>&1"
+				stop_rpitx = "sudo killall -9 arecord && sudo rpitx -m RF -f  434.9e3 > /dev/null 2>&1"
 				if not txc:
 					print("txc is:")
 					print(txc)
 					system(stop_rpitx)
-					system(rpitx)	
+#					system(rpitx)	
 					print("Safe Mode!!")
 				while (True):
 					if (txc):
@@ -577,18 +955,24 @@ if __name__ == "__main__":
 						while (input(ptt) != 1):
 							sleep(0.2)					
 						output(txLed, 0)
+						if (mode == 'p') and (doppler_mode):
+							update_doppler()
 #						print("0")
 					else:
 #						sleep(0.1)
 						while (input(17) == 0):
 							sleep(0.05)
-##						system(rpitx)
+						system(rpitx)
 						output(txLed, 1)
 #						print("1")
 						while (input(17) == 1):
 							sleep(0.05)					
-##						system(stop_rpitx)
+						system(stop_rpitx)
 						output(txLed, 0)
+						if (mode == 'p') and (doppler_mode):
+							update_doppler() # "no")						
+							rpitx = "arecord -D plughw:CARD=Loopback,DEV=1 -f S16_LE -r 48000 -c 1 | csdr convert_s16_f | csdr gain_ff 4000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f " + tx + "e3 > /dev/null 2>&1 &"
+
 #						print("0")						
 						
 #						sleep(10)
@@ -611,11 +995,10 @@ if __name__ == "__main__":
 					system("cat /home/pi/CubeSatSim/t.txt")
 					if (command_tx == True):
 						output(txLed, 1)
-#						output(pd, 1)
-#						output (ptt, 0)
-#						sleep(.1)
-#						
-#						battery_saver_check()
+						if (doppler_mode == True):
+							update_doppler()
+							txf = tx_doppler_freq_hz / 1e6
+							tx = "{:.4f}".format(txf)
 						if (txc):
 							sim_failure_check()
 #							output(pd, 1)
@@ -627,7 +1010,9 @@ if __name__ == "__main__":
 							output (ptt, 1)
 #							output(pd, 0)							
 						else:
-							system("echo 'AMSAT-11>APCSS:010101/hi hi ' >> t.txt")
+#							system("echo 'AMSAT-11>APCSS:010101/hi hi ' >> t.txt")
+							system("echo 'AMSAT-11>APCSS:010101/hi hi ' | sudo tee -a /home/pi/CubeSatSim/t.txt")
+
 							if (debug_mode == 1):
 								system("gen_packets -o /home/pi/CubeSatSim/telem.wav /home/pi/CubeSatSim/t.txt -r 48000 > /dev/null 2>&1 && cat /home/pi/CubeSatSim/telem.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + tx + "e3")
 							else:
@@ -645,7 +1030,8 @@ if __name__ == "__main__":
 						
 					sleep(0.5)
 	
-				except:
+				except Exception as e:
+#					print(f"An error occurred: {e}")	
 #					command_control_check()
 					sleep(1)
 		elif (mode == 'm'):
@@ -654,42 +1040,59 @@ if __name__ == "__main__":
 			while True:
 #				command_control_check()
 				output (pd, 1)
-				output (ptt, 1)				
+				output (ptt, 1)					
 				try:
 					f = open("/home/pi/CubeSatSim/cwready")
 					f.close()
 					system("sudo rm /home/pi/CubeSatSim/cwready")
 ##					ch = 1
 					for chan in range(7):
-						command = "gen_packets -M 20 -o /home/pi/CubeSatSim/morse.wav /home/pi/CubeSatSim/cw" + str(chan) + ".txt -r 48000 > /dev/null 2>&1"
-						print(command)
-						system(command)
-##						chan = chan + 1						
-						if (command_tx == True):
-							output(txLed, 1)					
-	
-							if (txc):
-								sim_failure_check()
-#								output (pd, 1)
-								sleep(0.3)
-								output (ptt, 0)	
-								system("aplay -D plughw:CARD=" + card + ",DEV=0 /home/pi/CubeSatSim/morse.wav")
-								sleep(0.1)
-								output (ptt, 1)
-#								output (pd, 0)
-							else:
-								if (debug_mode == 1):
-									system("cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + tx + "e3")
+						if (doppler_mode):
+							try:
+#								update_doppler()
+								filename="/home/pi/CubeSatSim/cw" + str(chan) + ".txt"
+								print(filename)
+								file = open(filename)
+								cw_string = file.readline()
+								print(cw_string)
+								cw_transmit_string(cw_string)
+							except Exception as e:
+								print(f"An error occurred: {e}")
+								print("error reading cw string " + str(chan))
+						else:	
+							command = "gen_packets -M 20 -o /home/pi/CubeSatSim/morse.wav /home/pi/CubeSatSim/cw" + str(chan) + ".txt -r 48000 > /dev/null 2>&1"
+							print(command)
+							system(command)
+	##						chan = chan + 1						
+							if (command_tx == True):
+								output(txLed, 1)					
+								if (doppler_mode == True):
+									update_doppler()
+									txf = tx_doppler_freq_hz / 1e6
+									tx = "{:.4f}".format(txf)
+								if (txc):
+									sim_failure_check()
+	#								output (pd, 1)
+									sleep(0.3)
+									output (ptt, 0)	
+									system("aplay -D plughw:CARD=" + card + ",DEV=0 /home/pi/CubeSatSim/morse.wav")
+									sleep(0.1)
+									output (ptt, 1)
+	#								output (pd, 0)
 								else:
-									system("cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + tx + "e3 > /dev/null 2>&1")		
-							output(txLed, 0)
-							
+									if (debug_mode == 1):
+										system("cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + tx + "e3")
+									else:
+										system("cat /home/pi/CubeSatSim/morse.wav | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo /home/pi/rpitx/rpitx -i- -m RF -f " + tx + "e3 > /dev/null 2>&1")		
+								output(txLed, 0)
+								
 #						command_control_check()
 						sleep(2)
 					f.close()
 					sleep(10)
 				except:	
 #					command_control_check()
+#					print("cw not ready")
 					sleep(1)
 		elif (mode == 's'):
 			print("SSTV")
@@ -728,6 +1131,10 @@ if __name__ == "__main__":
 					
 					if (command_tx == True):
 						print ("Sending SSTV image")
+						if (doppler_mode):
+							update_doppler()
+							txf = tx_doppler_freq_hz / 1e6
+							tx = "{:.4f}".format(txf)						
 						output(txLed, 1)
 #						battery_saver_check()
 
@@ -755,10 +1162,13 @@ if __name__ == "__main__":
 					system("/home/pi/PiSSTVpp/pisstvpp -r 48000 -p s2 /home/pi/CubeSatSim/camera_out.jpg") 
 					system("sudo rm /home/pi/CubeSatSim/camera_out.jpg > /dev/null 2>&1") 
 
-#					command_control_check()			
-
 					if (command_tx == True):
 						print ("Sending SSTV image")
+						if (doppler_mode):
+							update_doppler()
+							txf = tx_doppler_freq_hz / 1e6
+							tx = "{:.4f}".format(txf)
+						
 						output(txLed, 1)
 #						battery_saver_check()
 
@@ -795,6 +1205,10 @@ if __name__ == "__main__":
 					if (command_tx == True):
 
 						print ("Sending SSTV image")
+						if (doppler_mode):
+							update_doppler()
+							txf = tx_doppler_freq_hz / 1e6
+							tx = "{:.4f}".format(txf)							
 						output(txLed, 1)
 
 #						battery_saver_check()
@@ -826,11 +1240,13 @@ if __name__ == "__main__":
 					system("/home/pi/PiSSTVpp/pisstvpp -r 48000 -p s2 /home/pi/CubeSatSim/sstv_image_2_320_x_256.jpg")
 
 					while 1:
-
-#						command_control_check()		
-	
 						if (command_tx == True):
 							print ("Sending SSTV image")
+							if (doppler_mode):
+								update_doppler()
+								txf = tx_doppler_freq_hz / 1e6
+								tx = "{:.4f}".format(txf)
+							
 							output(txLed, 1)
 #							battery_saver_check()
 
@@ -858,11 +1274,11 @@ if __name__ == "__main__":
 							system("(while true; do (sleep 10 && cat /home/pi/CubeSatSim/wav/sstv.wav); done) | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f " + tx + "e3 &")
 					while 1:
 						if (command_tx == True):
-#							command_control_check()	
-							
+							if (doppler_mode):
+								update_doppler()
+								txf = tx_doppler_freq_hz / 1e6
+								tx = "{:.4f}".format(txf)							
 							output(txLed, 1)
-
-#							battery_saver_check()
 						
 							if (txc):
 								sim_failure_check()
@@ -882,9 +1298,11 @@ if __name__ == "__main__":
 		elif (mode == 'b') or (mode == 'j'):
 #			command_control_check()	
 			if (mode == 'b'):
-				print("BPSK")
+				print("BPSK")		
 			else:
 				print("FUNcube")
+			if (doppler_mode):
+				print("No doppler shift in this mode")					
 			print("turn on FM rx")
 			output(pd, 1)
 			output(ptt, 1)
@@ -949,28 +1367,31 @@ if __name__ == "__main__":
 				print("Beacon mode off so no repeater transmission")
 
 			print("Ready to detect carrier")
+#			if (doppler_mode):
+#				update_doppler()
+#				txr = "{:.3f}".format(tx_doppler_freq_hz/1e6)
+#			cw_transmit_fm(callsign + status, txr)	
+			start_time = time.perf_counter()
+						
 			while True:
 				if (input(squelch) == False) and (command_tx == True):
-					print("Carrier detected, starting repeater")
-					output(txLed, 1)
-					system("sudo nc -l 8011 | csdr convert_i16_f | csdr gain_ff 4000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f " + tx + "e3 > /dev/null 2>&1 &")
-					sleep(0.5)
-					system("sudo arecord -D shared_mic -r48000 -fS16_LE -c1 | nc localhost 8011 &")
+					print("Carrier detected")
+					if (doppler_mode):
+						update_doppler() 
+						start_repeater(tx_doppler_freq_hz, rx_doppler_freq_hz)
+					else:
+						start_repeater(txrf * 1e6, rxf * 1e6)
 					while (input(squelch) == False):
 						sleep(1)
-					print("No carrier detected, stopping repeater")
-					output(txLed, 0)
-					system("sudo rpitx -i null > /dev/null 2>&1")
-					system("sudo killall -9 arecord > /dev/null 2>&1")
-					system("sudo killall -9 nc > /dev/null 2>&1")
-					system("sudo killall -9 rpitx > /dev/null 2>&1")
-					print("Resetting audio")
-					system("sudo /etc/init.d/alsa-utils stop")
-					system("sudo /etc/init.d/alsa-utils start")
-					print("Finished resetting audio")
-					print("Ready to detect carrier")
+					print("No carrier detected")
+					stop_repeater()
+				if ((time.perf_counter() - start_time) > 10) and doppler_mode:
+					update_doppler()
+					start_time = time.perf_counter()
 		else:
 			print("FSK") 
+			if (doppler_mode):
+				print("No doppler shift in this mode")				
 			print("turn on FM rx")
 			output(pd, 1)
 			output(ptt, 1)