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R.F. Feedback issue

Feb 1st 2016, 14:20


Joined: Oct 17th 2015, 21:54
Total Topics: 0
Total Posts: 0
When transmitting digital modes, my software immediately freezes, and the transmitter switches to recieve. This only happens above 20 watts, and only on 20 meters.
Ive not dealt with RF issues before so any suggestions would be greatly appreciated.
John. KI3T
Feb 1st 2016, 15:54


Super Moderator

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
You may need to decouple the wires attached to the computer. I've used large FT-240-43 toroids--10 turns should work OK on 20 meters. If the wires are thin you can wrap several wires around the same toroid.

Zack W1VT
ARRL Senior Lab Engineer
Feb 4th 2016, 01:03


Joined: Jun 12th 2012, 23:07
Total Topics: 0
Total Posts: 0
Another fix is .01 mf disc ceramics across the audio lines. (hi to ground)

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