[arm-allstar] Asterisk - Hum

[Terry Bethlehem]

You didn't show much of how the repeater is set up. Could be rf getting
into the interface or pi. I'd suggest to get the tx antenna farther away
from the node and hardware. I had a similar problem and using an external
antenna fixed my issue.

On Dec 13, 2017 5:15 PM, Eric Smyder via arm-allstar <
arm-allstar at hamvoip.org> wrote:

> Hello all:
>
> I've been experimenting with HAMVOIP, on a Pi3 at the home QTH with a
> BF-888s as my radio.  It is a remarkably good system and easy to
> configure.  However, I'm having an issue.  It is actually the same issue I
> noticed on the W3HZU 6 meter repeater.
>
> The video links below exemplifies the issue.  When transmitting directly
> from the repeater with the hand-mic the repeater sounds great.  When I
> trigger the AllStarLink from Asterisk, or when the node makes an
> announcement or identifies, there is a distinct tone or hum.  I get the
> same thing on my Pi 3 at the house if I key the transmitter and speak into
> the BF-888s.  It seems to be coming through the computer or being picked up
> somewhere in the connections to the URI.  I have taken measures to shield
> the wiring between the radio and the URI, but the hum is still there.
>
> At W3HZU 6m AllStarLink
> https://photos.app.goo.gl/OtJn3aK2ZRCd6cPs2
>
> At the home QTH using the Pi3, where the hum is more noticeable.
> https://photos.app.goo.gl/XsUC4on5t04LH6CS2
>
> Has anyone else noticed this and is there something I can do about it?
>
> Thanks,
>
> Eric
> N3FIX
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