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Radio Problem

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rveighta(at)earthlink.net
Guest

Posted: Tue Sep 23, 2008 4:24 am Post subject: Radio Problem

Bob, I have an Apollo SL-30 radio in my RV-8 which has a rather unique problem; on the ground, even with the engine running at high RPM, the radio transmits and receives flawlessly. In the air it's a different story. As soon as I take off, a loud background noise begins which makes receiving transmissions nearly impossible. Usually, sometime during the flight, this noise goes away and the reception is crystal clear. The background noise doesn't seem to affect transmissions



I have a belly mounted Comant bent whip antenna. Coax connections are tight. Any idea of what the problem might be?



Thanks,



           Walt Shipley

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nuckolls.bob(at)cox.net
Guest

Posted: Tue Sep 23, 2008 8:12 am Post subject: Radio Problem

At 08:21 AM 9/23/2008 -0400, you wrote:

 	  Quote: 	
		  



Bob, I have an Apollo SL-30 radio in my RV-8 which has a rather unique 

problem; on the ground, even with the engine running at high RPM, the 

radio transmits and receives flawlessly. In the air it's a different 

story. As soon as I take off, a loud background noise begins which makes 

receiving transmissions nearly impossible. Usually, sometime during the 

flight, this noise goes away and the reception is crystal clear. The 

background noise doesn't seem to affect transmissions



I have a belly mounted Comant bent whip antenna. Coax connections are 

tight. Any idea of what the problem might be?


	


    Do you have a hand-held transceiver you can connect to

    this antenna? It would be useful to know if the noise

    in coming in through the antenna or elsewhere. Does

    the noise go up and down with the radio's volume

    control?



    I presume you've explored potential antagonist devices

    in the airplane. Can you do a test flight with fuses/

    breakers pulled for everything except engine and radio?



    Have you shut the alternator off to see if the noise

    goes away?



    Bob . . .

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mprather(at)spro.net
Guest

Posted: Tue Sep 23, 2008 9:24 am Post subject: Radio Problem

Is there a squelch on the monitored frequency?  I haven't messed with an

SL-30 enough to know, but I could imagine that the monitored frequency my

pick up noise and drown out the primary frequency.  Total conjecture on my

part.  Discard as necessary..  

Regards,



Matt-



 	  Quote: 	
		   

 <nuckolls.bob(at)cox.net>



 At 08:21 AM 9/23/2008 -0400, you wrote:

>

> <rveighta(at)earthlink.net>

>

>Bob, I have an Apollo SL-30 radio in my RV-8 which has a rather unique

>problem; on the ground, even with the engine running at high RPM, the

>radio transmits and receives flawlessly. In the air it's a different

>story. As soon as I take off, a loud background noise begins which makes

>receiving transmissions nearly impossible. Usually, sometime during the

>flight, this noise goes away and the reception is crystal clear. The

>background noise doesn't seem to affect transmissions

>

>I have a belly mounted Comant bent whip antenna. Coax connections are

>tight. Any idea of what the problem might be?



     Do you have a hand-held transceiver you can connect to

     this antenna? It would be useful to know if the noise

     in coming in through the antenna or elsewhere. Does

     the noise go up and down with the radio's volume

     control?



     I presume you've explored potential antagonist devices

     in the airplane. Can you do a test flight with fuses/

     breakers pulled for everything except engine and radio?



     Have you shut the alternator off to see if the noise

     goes away?



     Bob . . .

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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