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djtoddb
Joined: 26 Mar 2010
Posts: 14
Location: Mesa, AZ
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 Posted: Tue Oct 29, 2013 8:28 am Post subject: Transponder Interference with Icom A-22 Comm Radio |
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I just installed a Sandia Transponder with an Icom A-22 handheld radio hard wired into the electrical system. On the first flight, ATC had a difficult time understanding me and I heard "clicks" in then headset while receiving. Not knowing if it was RF interference from the transponder OR feedback from the aircraft 12 volt power system, I removed the hard wire power from the radio and used the battery pack... Everything worked great. I even placed the VHF receiver within a inch of the transponder antenna while it was being interrogated and it still worked fine.
Seems I am having some strange pulses running through the 12V system while the transponder is ON because it is eliminated when I remove acft power from it and use the battery pack.
QUESTION - Is there something I can do or install that will isolate electrically the Comm Radio from getting this feedback from the transponder OR is there something I can add to the Transponder Power feed?
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Titan Tornado II with Jab 3300 |
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Wed Oct 30, 2013 6:30 am Post subject: Re: Transponder Interference with Icom A-22 Comm Radio |
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Maybe something like this ebay item # 131025623616 will help.
I learned that sellers in China sometimes exaggerate the capabilities of their products. So divide the rated output of the DC to DC Converter by 2. Also note that most of these devices have a non-isolated output. I interpret that to mean that the negative input and negative output are connected together, if that is of any concern to you. I think that converters without a heat-sink can only handle up to one amp.
Joe
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Joe Gores |
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