I am getting feedback on my Marine VHF radio from my hailer horn?

This is caused by your microphone picking up the output of your hailer horn (feedback). This can be mitigated by one or all of the following:

1. Install the hailer horn further away from the radio.
2. Be sure the hailer horn faces away from the microphone.
3. Use only as much hailer audio power as you need.
4. Verify the polarity of the hailer wiring to the radio. Reverse polarity will cause feedback.

04/02/2021