diff --git a/transmit.py b/transmit.py
index 72c50942..315f5cdf 100644
--- a/transmit.py
+++ b/transmit.py
@@ -994,7 +994,7 @@ if __name__ == "__main__":
 			print(rx_doppler_start_hz)
 			while True:
 				if (input(squelch) == False) and (command_tx == True):
-					tx_doppler_shift_hz = (time.perf_counter() - start_time) * 60
+					tx_doppler_shift_hz = ((time.perf_counter() - start_time) * 100) % 20000
 					tx_doppler_freq_hz = tx_doppler_start_hz + tx_doppler_shift_hz
 					print(tx_doppler_freq_hz)
 					txr = "{:.3f}".format(tx_doppler_freq_hz/1000)