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AeroElectric-List Digest: 1 Msgs - 04/28/11

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n16ld(at)yahoo.com
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Posted: Fri Apr 29, 2011 7:09 am Post subject: AeroElectric-List Digest: 1 Msgs - 04/28/11

John,

  

 Thanks for the pics. I see the water on our steps to dock. Boys look like they like each other. 

  

 Regards,

  

 Larry

 



   

From: AeroElectric-List Digest Server <aeroelectric-list(at)matronics.com>

To: AeroElectric-List Digest List <aeroelectric-list-digest(at)matronics.com>

Sent: Friday, April 29, 2011 2:56 AM

Subject: AeroElectric-List Digest: 1 Msgs - 04/28/11



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                    Total Messages Posted Thu 04/28/11: 1

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    1. 02:28 PM - Strange radio transmit problems - take 2  (Peter Pengilly)



________________________________  Message 1  _____________________________________

Time: 02:28:05 PM PST US

From: Peter Pengilly <peter(at)sportingaero.com (peter(at)sportingaero.com)>

Subject: Strange radio transmit problems - take 2

In June last year I wrote about a problem I was having with the 

transmitter in my airplane where the radio would not transmit on some 

frequencies. I wonder if I could again ask for some advice?



I thought I solved the problem by replacing the radio to antenna coax - 

but all I in fact did was shift the frequencies that were problematic. 

Since then I have tried several different fixes without any success. I 

have improved the grounding of the antenna, replaced the antenna and 

tried several different headsets, all with no change to the problem. I 

have found that on the ground without the engine running the radio will 

transmit on all frequencies (or at least in 1 MHz steps through the 

frequency band). In the air some frequencies cause a problem (such as 

118.9,  125.25 and 127.05), but throttling back to idle sometimes 

produces an intelligible transmission, although not great. When the 

radio does not transmit it is obvious as no side tone is heard in the 

headset, sometimes carrier wave only is transmitted.



The voltage regulator (PMR-1) for the SD-8 alternator is mounted very 

close ahead of the radio, along with the large capacitor and OV thing, 

I'm now wondering if there is some kind of electro magnetic interference 

happening? Of course the best check would be to go fly with the 

alternator off, and I should be able to do that over the next few days 

(there's some wedding going on here tomorrow that is getting in the way 

of everything ...). Assuming it is interference, how far away from the 

radio should I mount the VR, is the back side of the firewall a suitable 

location? Should the capacitor be close the the VR, or doesn't it 

matter? Its a Becker AR-4201  radio, Becker say that if it transmits on 

any one frequency there is nothing wrong with the radio. Transmit is 

good on some frequencies (for example 122.6, 129. and receive is 

always strong.



Thanks for y the Web bsp;                 -Matt Dralle, ===========



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