GMA340 problems

[mccdeuce]

So for the most part my audio panel and radios are perfect... for the most part.  

I have a GMA340, SL-30 nav/comm and an IFD440 (previously GNS430)

Problem 1) Select comm 1, IFD comm sounds great. Select comm 2 SL30 comm sounds great. Select both comm 1 and comm 2 and SL30 still sounds fine but IFD is very static on the transmission. experimenting if this has to do with both radios standby freq monitoring. 

Problem 2) aux music 2 works as advertised and brings music to all 4 seats. Aux music 1 doesn't work at all. 

I am inclined to think wiring issues, and have also thought about upgrading to PMA8000, PMA450 or the AMX240, but obviously don't want to bring issues forward. 

Anyone troubleshot these before?

Mark

[cnoe]

To clarify...

IIRC you cannot select both "Com/Mic" buttons simultaneously, but you can select one "Com/Mic" and a "Com" (receive-only) at the same time.

I too have some degradation of sound quality (in my own headset) when transmitting on 1 while also monitoring 2. This seems more pronounced while on the ground.

I've been told that the close proximity of the radio antennas may be partly to blame and I believe it's exacerbated by ground reflection/interference.

I also believe that others' reception quality is unaffected by this phenomenon.

This may not be your situation but it is simply my experience with a similar (though not identical) setup.

I have no comment on your music issue. I also don't know if a different audio panel would change anything.

Not sure my comments help.




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[mccdeuce]

Same panel. You are correct you can not select both except for the com 1/2 for pilot/copilot isolation. 

I will look to see if my transmissions are actually garbled or if it is just my headset. 

Thanks

[cnoe]

Ask a fellow pilot to assess the quality of your transmissions from another plane while airborne.

This has annoyed me too in the past but isn't necessarily a serious issue.


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[LANCECASPER]

See if someone on your field or your local shop has a GMA 340 you could slide in to see if you are getting the same symptoms.

[mccdeuce]

13 hours ago, LANCECASPER said:

See if someone on your field or your local shop has a GMA 340 you could slide in to see if you are getting the same symptoms.

Hats a really good idea actually. Simple and easy.