diff --git a/transmit.py b/transmit.py
index c9569f08..4f07ee2d 100644
--- a/transmit.py
+++ b/transmit.py
@@ -678,6 +678,9 @@ 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: