REFLECTOR: Trig TT-31 ADS-B transponder

John Dibble aminetech at bluefrog.com
Mon Dec 30 11:21:53 CST 2013


That's helpful.  It's random.  Not sure if there is an activity 
indicator, I'll check.  I turned off the gps and the noise continued.  I 
also turned off the radio and intercom and the noise continued.  I'm 
using a Zulu noise cancelling headset.  I'll check that.

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
>
> Velocity  173 RG  N199RS
> Starduster  N666SK
> KR2         N24TC
> W7QJQ
>
>
> Another possibility is  the
> From: "John Dibble" <aminetech at bluefrog.com>
> Subject: Re: REFLECTOR: Trig TT-31 ADS-B transponder
>
>
>> I found a way to make gps work with the transponder.  With the gps 
>> operating, I turn the transponder on and off from 1 to several times 
>> until it gets "in sync" with the gps and then it works properly.  One 
>> remaining issue is a slight popping noise in my headset.  If I turn 
>> the transponder off or in standby, the noise goes away.  Any ideas 
>> what causes this?
>>
>> John
>
>
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