Over modulation of the transmit audio?
output to your transceiver. This can be set up in AirMail. Read the AirMail help files. Reduce the transmit audio gain level. Less is Better. • Maybe you need a better antenna? • Maybe you have an “RF or Audio” problem due to RF feedback into your system. Use ferrite chokes and/or less power output. • Better earth ground connection or counterpoise. • If you are using a battery for power, is the battery voltage too low? In this case maybe a lower power output setting may work better. • Turn off all processors, compressors and filters on both the receiver and transmitter. • Is your receive bandwidth filter wide enough for the mode used? Pactor 3 needs 2.4 KHz.; Pactor 2 needs 0.7 KHz; Pactor 1 needs 0.6 KHz. Some radios do not perform well with both the microphone and the TNC connected simultaneously to the radio. Disconnect the microphone.
