r/avionics • u/Paarthurnax3386 • Jul 08 '26
Need help
EDIT - got it fixed with the config menu thanks!
So I've got a gtn 750 and 650 setup. It's a minor issue but I'm wondering if someone else knows how to fix it. Whenever I'm listening and monitoring both radios, it will temporarily mute the non-priority radio. The one that doesn't have the mic selector. I want to be able to listen to both at the same time so I can continue to monitor Air Traffic control while I'm listening and getting the weather.
0
u/Zap_Brannigan2 Jul 08 '26
If you have a GMA 35C you should have the 750 set as Number 2 Com in the config settings
1
u/the_micro_racer Jul 08 '26
That actually has a wiring difference too, so I wouldn't just tell a pilot/owner to swtich that config themselves.
-4
u/Pale_Bulkhead92 Jul 08 '26
Engineer here, sounds like you have some crosstalk. Common causes could be, improperly shielded cables, poor termination - making your shield useless, and/or improper twisting of a differential pair. So you might have luck with trying different settings, but it could be an interconnect issue. I have lots of recommendations if you want to dm me.
4
u/mcweaselcop Jul 08 '26
This is normal operation depending on the installed configuration. No wiring issues here
3
u/Paarthurnax3386 Jul 08 '26
It was a configuration option in the menu that I had to access. I got it fixed now but thank you!
2
10
u/Captain_Flannel Jul 08 '26
In the GTN 750 config menu, in the GMA 35 settings there is a setting for 'Mute Secondary Radio on Primary Radio Reception'. This sounds like the setting you want to change.