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Radio Noise

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rv7a(at)cox.net
Guest

Posted: Wed Jun 02, 2010 9:44 am Post subject: Radio Noise

Here is a tough one that maybe some of you guys can point  me in the right direction to look.  Set up is: RV-7A with an SL-30, Bob  Archer antenna in left wingtip, with PTT on stick also FWIW I have a P-Mag and  E-mag.  Radio is excellent on ground in both transmit and receive,  reception in air is OK however when I press the PTT the noise is horrible with  static and breaking up.  This has been a consistent condition.   Attempts to correct the problem have been: checking antenna installation in  wingtip, everything seems fine, Checking connectors where stick PTT plugs into  the system, the PTT pin may not have been fully seated, it is now, trying  different headsets.  Nothing has solved the problem to date.  I have  been working with the tower on this flying the same circuit and when I contact  them it is always somewhere between almost NORDO to just generally poor  communications. When I'm back on the ground everything is just fine again.   Ideas, directions or suggestions?

  

 Jim Thorne

 RV-7A CHD

 About 12 Hours  now.

    [quote][b]

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dalamphere(at)comcast.net
Guest

Posted: Wed Jun 02, 2010 11:56 am Post subject: Radio Noise

Jim,

  

 You didn't say what you were using for a headset  and intercom.

  

 If the headset's mike is too sensitive, and your  cockpit (while flying) is so noisy that it overwhelms the intercom (or radio)  input - this could cause your symptoms. If there's a second headphone connected  but left in place (not used), this will also cause a great deal of noise  troubles.

  

 Try and find someone to loan you a different  headset (preferrably one that has active noise cancelling) and see what that  does...

  

 Just a suggestion...

  

 Dave L.

 Wittman Tailwind (60hrs)

 (quite a noisy cockpit: PS1000II intercom and  Lightspeed Zulu + 15XL headsets work OK)

  

  

  

 [quote]   ---

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Jun 02, 2010 12:54 pm Post subject: Radio Noise

At 12:42 PM 6/2/2010, you wrote:

  	  Quote: 	
		   Here is a tough one that maybe some of you guys can point me in the right direction to look.  Set up is: RV-7A with an SL-30, Bob Archer antenna in left wingtip, with PTT on stick also FWIW I have a P-Mag and E-mag.  Radio is excellent on ground in both transmit and receive, reception in air is OK however when I press the PTT the noise is horrible with static and breaking up. 	


   "Static" implies a condition like the noises heard as

   a result of lightning strikes, spark plugs firing and

   other electrical conditions common to the generation

   of sparks. "Breaking up" suggests that the desired signal

   (in this case your voice) is there sometimes and

   absent for other times.



   Does your microphone/headset combo include intercom

   operations . . . or can it include such operations?

   Are the noises present in intercom mode as well as

   radio transmit?



   Try a plain ol' hand-held microphone in the place

   of your headset microphone. Is the noise condition

   any different?



   As others have suggested, the condition you describe

   is MOST likely a head set problem wherein the noise

   cancelling characteristics of the microphone are

   poor to nil. While airborne, hit the PTT button

   on the stick with the microphone connector unplugged.

   Does the noise go away?



 

   Bob . . .    [quote][b]

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