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My Sandia Transponder interferes with my Com Radio.

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Joined: 26 Mar 2010
Posts: 13
Location: Mesa, AZ

PostPosted: Mon Sep 01, 2014 11:21 am    Post subject: My Sandia Transponder interferes with my Com Radio. Reply with quote

I have an Icon A-22 wired (no battery) into my Titan Tornado with a Sandia STX-165. The antennas are as far apart as I can get them at about 4'. When the transponder is interrogated and "replys", it causes a popping in the radio that affects both the reception and transmission. ATC can't understand my voice unless I turn the transponder to "stby".
I tried using an external 12V battery for the Icom Radio and it worked MUCH Better.
Any Thoughts out there ????

On Monday, September 1, 2014 11:44 AM, "Robert L. Nuckolls, III" <nuckolls.bob(at)> wrote:

At 10:15 AM 9/1/2014, you wrote:
Hi Bob,

I read your book through and I think have understood the basics. It gave me a super know how boost, thanks. Right now I am on the electric schema for a Zenith STOL 750 with Rotax 912 ULS 2.

One thing I do not understand: In no Z-Drawing is the Ignition Switch / Start Button connected to the endurance bus? In case of a failure of the master relay or master switch it is not possible to restart the engine in this configuration as far as I understood the different drawings. Although it might rarely occur that at the same time in flight you need to restart the engine and the main bus is not available (would mean there is a kind of a big problem). But it would surely help to have the security to be able to turn the engine; or may the windmill effect make my need redundant?

Does the 912 engine windmill on a STOL750? I don't know
but the people who are building and flying these airplanes
SHOULD know . . . and this information is best acquired from
the factory.

So is there any reason not to connect the ignition/engine start switch to the endurance bus?

If the main bus is down, this means the battery master contactor is open. So being able to put power on the starter contactor is not very useful whene there is no power for the contactor to control. Sorry for the question you probably already answered many times but I could not access the FAQ Part on your page.
No problem. I'll look into that FAQ link. But in any case, the legacy failure mode effects analysis for light aircraft does not stack multiple failures. The vast majority of engines stop because of fuel starvation. Your pondering of "Plan-B" alternatives would do well to consider all the ways that mechanical failure in the fuel delivery system can be managed . . . the kit folks have probably done this already but you need to understand it. In other words, the elegant answer to your question is: "Minimize or eliminate the reasons that your engine might quit in flight so that you don't find yourself short on the Main Bus power as well!

Bob . . .

Bob . . . [quote]

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