diff --git a/transmit.py b/transmit.py
index e40ecba4..d4863e21 100644
--- a/transmit.py
+++ b/transmit.py
@@ -1070,6 +1070,7 @@ if __name__ == "__main__":
 				output (pd, 1)
 				output (ptt, 1)	
 
+				update_doppler()
 				filename="/home/pi/CubeSatSim/cw0.txt"
 				print(filename)
 				file = open(filename)
@@ -1084,15 +1085,17 @@ if __name__ == "__main__":
 ##					ch = 1
 					for chan in range(7):
 						if (doppler_mode):
-#							try:
-							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:
-#								print("error reading cw string " + str(chan))
+							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)