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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