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Radio Noise Answer

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dalamphere(at)comcast.net
Guest

Posted: Thu Jan 14, 2010 1:10 pm Post subject: Radio Noise Answer

About a month ago I requested some ideas about what could be causing my King 

KX125 nav com  to have a screeching/hi-freq whistle (in the headsets) every 

time I pressed the PTT button (like feed-back) - for the first 5-10min after 

a startup - on cold mornings. After running for a while - even on re-fueling 

stops this problem would not surface again. No-one from the group rose to 

the challenge - but then again - maybe I didn't give enough data for anyone 

to form an opinion or theory. 



At first the alternator was suspected - a call to SkyTek resulted in them 

sending me a filter cap to put on the output stud of the alternator to 

ground. No difference.



Then the radio's adjustment of side-tone was suspected. Decreased - no 

change.



This morning I finally tracked it down - at cold temperatures (<40) the 

problem will show-up. If you take the radio out, pre-heat it (I put mine in 

my car with the heater going) and bring it up to 70 deg or so, put it back 

in and voila! No whistle at initial startup.



This problem only showed up when the temps fell this winter.



Just thought it might help someone else who might experience the same 

problem.



I guess you have to pre-heat radios as well as engines!   



Dave

N365DL

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bsavage22(at)hotmail.com
Guest

Posted: Fri Jan 15, 2010 1:44 pm Post subject: Radio Noise Answer

In my certified airplane C I leave an 80 watt heater on and under the panel in the winter when the airplane is not in use.  My reason was just to keep it a little warmer than otherwise and to help reduce any condensation that might occur.  Maybe the same could help you.  I got the heater at the hardware store and it is advertised to be used in boats and motorhomes.

Bob

 	  Quote: 	
		   From: dalamphere(at)comcast.net

 To: aeroelectric-list(at)matronics.com

 Subject: Radio Noise Answer

 Date: Thu C 14 Jan 2010 16:08:24 -0500

 --> AeroElectric-List message posted by: "David & Elaine Lamphere" <dalamphere(at)comcast.net>

 About a month ago I requested some ideas about what could be causing my King 

 KX125 nav com  to have a screeching/hi-freq whistle (in the headsets) every 

 time I pressed the PTT button (like feed-back) - for the first 5-10min after 

 a startup - on cold mornings. After running for a while - even on re-fueling 

 stops this problem would not surface again. No-one from the group rose to 

 the challenge - but then again - maybe I didn't give enough data for anyone 

 to form an opinion or theory. 

 At first the alternator was suspected - a call to SkyTek resulted in them 

 sending me a filter cap to put on the output stud of the alternator to 

 ground. No difference.

 Then the radio's adjustment of side-tone was suspected. Decreased - no 

 change.

 This morning I finally tracked it down - at cold temperatures (<40) the 

 problem will show-up. If you take the radio out C pre-heat it (I put mine in 

 my car with the heater going) and bring it up to 70 deg or so C put it back 

 in and voila! No whistle at initial startup.

 This problem only showed up when the temps fell this winter.

 Just thought it might help someone else who might experience the same 

 problem.

 I guess you have to pre-heat radios as well as engines!   

&====

 	  Quote: 	

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dalamphere(at)comcast.net
Guest

Posted: Fri Jan 15, 2010 5:05 pm Post subject: Radio Noise Answer

Thanks Bob.

  

 I'll look into that - sounds like a good idea.

  

 Dave

 [quote]   ---

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