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Radio Transmits Poorly Only When On The Ground

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Nov 03, 2014 5:34 pm Post subject: Radio Transmits Poorly Only When On The Ground

At 06:06 2014-11-03, you wrote:

 	  Quote: 	
		  

<david.m.gallagher(at)ge.com>



I have a gremlin that I don't know how to troubleshoot. I have a 

601XL all-metal airplane with an Icom A-200 radio, a RAMI com 

antenna mounted on the top skin and connected with RG-400 cable. I 

did all the installation myself. I have had this flying for 6 years 

now. It transmits just fine in the air, but when I initially 

installed it, I would get comments that it was a bit garbled while 

transmitting on the ground. It was always good enough though, as I 

could still carry on a 2-way conversation, plus I was able to 

operate out of tower controlled airports and not get any negative 

radio comments. Receiving wise, I have always been able to hear just 

fine whether on the ground or in the air.



Just this summer, I started to get comments from fellow pilots that 

I was totally unreadable while transmitting on the ground. It would 

become crystal clear as soon as I took off. Does anyone have any 

thoughts of why this could be occurring or any place in particular I 

should start my troubleshooting??



Thanks,


	


   What tests have you run? Have you tried a different

   microphone? Does your system include an intercom

   or does the mic connect directly to the radio?



   Bob . . .

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DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Tue Nov 11, 2014 11:35 am Post subject: Re: Radio Transmits Poorly Only When On The Ground

Bob,



I finally got back out to the airport with an assistant and my hand-held radio.  

My all-metal airplane has an Icom A-200 radio going through a PS Engineering PM501 intercom, but I also have aux headset jacks that go directly to the Icom.



I transmitted both engine-off and engine-on.  We set up a sequence where I used both my Bose X headset and a cheap passive headset.  I swapped them between the pilot and co-pilot intercom jacks as well as the aux radio jack.  I also varied the engine RPM to see if low voltage was an issue as I have a Jabiru with a dynamo alternator that does not charge at idle.  We could not reproduce garbled transmissions with any combination.  We did note that the anything transmitting out of the pilot intercom jacks had a slight more static that the other jacks.  



The next time I go flying with some friends and their aircraft, I will repeat the test again with them listening in on airplane radios.



Thanks,

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_________________
David Gallagher
Cincinnati, OH area

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