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Comm will not transmit with audio panel installed

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vshimsl(at)live.com
Guest

Posted: Sun Apr 12, 2009 10:41 pm Post subject: Comm will not transmit with audio panel installed

Hello C



I had a squeal and no transmit on my King Radio. I had installed fiber washers on both jacks thinking I would prevent ground loops. When I used a jumper to ground the jacks to the panel C the squeal stopped and the radio worked. I removed the fiber washers effectively grounding the jack (sleeve I believe). Though you mention other issues (PTT for one) I think the key symptom is the squeal.



I would suggest you divide and conquer. Pretend you have one radio. Make a temporary jack panel and connect directly to each radio with your headset. If it has a built in push to talk switch C all the better.  Make sure the temporary panel and by default the headset jacks are properly grounded. If both radios work then you need to focus on the wiring to the audio panel. The fact you have replaced the audio panel leads me to believe it is ok.



If both radios have problems C then again I suggest you inspect the jack wiring as the odds on both radios having the same problem at the same time are a bit remote.



I would suspect least the coax / antennae. 



There is an excellent drawing with colored pictures of the jacks at Bob's aeroelectric site. 



The above will at least help you isolate it to a single device. 



I submit my reply as your problem sounded suspiciously similar to mine. The more I think about it C it sounds like the headset connection is not grounded properly causing the keying voltage to be fed through the transmit circuitry. 



But then again C I could be really full of it.



Good Luck



Vince H.

RV8 N8432 - Taxi Tests and oh so close!

From: claporte75(at)msn.com

To: aeroelectric-list(at)matronics.com

Subject: Comm will not transmit with audio panel installed

Date: Mon C 13 Apr 2009 03:30:18 +0000



     .ExternalClass .EC_hmmessage P {padding:0px;} .ExternalClass body.EC_hmmessage {font-size:10pt;font-family:Verdana;}    Hello C

 I have recently completed the installation of an avionics wiring harness (completed at an avionics shop) C and I have a perplexing problem of trying to get comm 1 to transmit...here are the details..... 	  Quote: 	
		  	
Windows Live™: Keep your life in sync. Check it out.  [quote][b]

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