REFLECTOR: Trig TT-31 ADS-B transponder

[John Dibble]

Looks like the noise is not random. It's 3 pops, each a second apart and 
then a group of 3 which is what made it seem random.  I tried it inside 
the hangar with the gps, encoder, intercom, radio, and noise cancelling 
headset off.

John

On 12/30/2013 10:35 AM, sbjknox at earthlink.net wrote:
> If the "...slight popping noise in my headset." is somewhat random in 
> occurrence, it is probably the transponder's high-power rf response 
> being picked-up by some portion of your audio system (com radio, 
> intercom, headset...).  Watch the activity light on your 
> transponder... if the radiated rf is causing the noise, it will be 
> coincident with the light.
> If the noise is not random but rather regular like once-per-second, 
> then it is probably related to the serial data stream out of the GPS 
> or some other serial data device that sends a data stream 
> periodically.  If this, perhaps improper grounding of a shielded cable 
> is the cause.
>
> $0.02
> Sid Knox
> Oklahoma
>


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