diff --git a/config b/config
index 5069e17c..b6e1398b 100755
--- a/config
+++ b/config
@@ -1168,10 +1168,10 @@ elif [ "$1" = "-F" ]; then
 	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
 
-	txf = ${7} * 1e6
-	rxf = ${8} * 1e6
+	rxf=$(echo "$8 * 1000000" | bc)
+	txf=$(echo "$7 * 1000000" | bc)
 	echo $txf $rxf
-	echo ${7} ${8} > /home/pi/CubeSatSim/frequency.txt
+	echo $txf $rxf > /home/pi/CubeSatSim/frequency.txt
 
 	echo
 	echo "Restarting CubeSatSim with new configuration file"