[arm-allstar] Asterisk - Hum

[David McGough]

Hi Eric,

You don't mention what type of interfaces you're using--like URI's, 
homebrew fobs, etc.???

The noise heard on the HamVoIP system sounds like noise from a switching 
power supply and/or ground loop in the audio path.

How are you powering the RPi3??  And, similarly for the BF888??


73, David KB4FXC


On Wed, 13 Dec 2017, "Eric Smyder via arm-allstar" 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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