[App_rpt-users] RTCM/Voter pulse noise

Chuck Henderson rpt2 at chuck.midlandsnetworking.com
Wed May 17 05:11:51 EDT 2017


I don't have any noise like that with voter boards or RTCMs.  My first
thought is that you may have a ground issue, or may not have your
audio wires shielded from your power/logic wires that are running in
the same cable.  Have you tried other boards or RTCMs with the same
cables?  Did you use the exact components to build the boards or did
you substitute any components, such as the regulators or capacitors?
I always use 2 separate cables into the common connector, one cable
carries shielded audio and audio ground and the other carries power,
logic levels (cor, ptt, etc) and power/logic ground.  If you have this
issue with both the boards and the RTCMs then IMHO, it must be a cable
issue.  (or a nut loose behind the control panel, just kidding :-)
 Chuck



On Wed, May 17, 2017 at 2:35 AM, Hayden Honeywood <haydenph91 at gmail.com> wrote:
> Did anyone get a chance to take a look at this for me?
> I'm interested as to where this issue is occurring and if anyone else can
> hear it on their voter board or RTCM?
>
> Hayden
>
> On Mon, May 8, 2017 at 4:04 PM, Hayden Honeywood <haydenph91 at gmail.com>
> wrote:
>>
>> Hi All,
>> Not sure if I've posted this here yet? I've had a pulsing high frequency
>> noise component on my transmit audio out of my VOTER boards. Has anyone come
>> across this? Seems to be in similar time with the status LED, but I assume
>> it's being generated from a chip somewhere.
>>
>> Here is a video of the issue -
>> https://www.youtube.com/watch?v=BJIzuMvpupk
>>
>> Whilst not particularly annoying and only heard at very low level, it is
>> peculiar. I've also tried injecting audio into another spot on the radio.
>> Also tried swapping GPS units, but could possibly be 1PPS noise?
>>
>> Hayden
>
>
>
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