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Loss of receive unless I switch TX to unused antenna port

Hello, I opened a ticket with this issue today. Posting here to see if anyone has come across this issue:

Flex 6700, Software 3.2.29. Windows 10 or Maestro (happens on either interface)

I only have one antenna currently plugged into ANT1. I noticed particularly bad receive performance today but had no problem transmitting with low SWR. After messing around with the radio for a while, I discovered that if I switch the TX to ANT2 while keeping ANT1 selected with RX, I get full RX performance back.


I have attached screenshots of the difference.

Things I have tried:

-Factory reset

-Recreated the issue with Maestro, not just SmartSDR.

-I moved my antenna to ANT2 port. Then the problem happens in reverse. I cannot get good receive performance unless TX is selected on ANT1.


  • John WA7UAR
    John WA7UAR Member ✭✭✭

    I have experienced something similar. But I think the explanation is how the RX Ant 1 is getting it’s RF pre-amplifier set higher when the TX is switched to another (in this case unused) antenna.

    Please check your slice’s RF pre-amplifier setting to see if you can make it higher and amplify the signals you are receiving on Ant 1.

  • Hi John, yes this doesnt seem to be helping. The ANT1 jack is completely dead, even with RF Gain all the way up, unless I turn TX to the unused port. IT must be something gone wrong with the relay circuit...

  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin

    If a reset of the radio does not resolve your issue, it sounds like you have a hardware issue with the radio.

    You will need to open a support ticket. If you do, please include your screen shots as they are very helpful.


  • Hi Mike, I did open one yesterday with the screenshots. I'm waiting for a reply from someone. Thanks!

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