[App_rpt-users] PI3 Audio Gaps

[David Osborn]

Hi Guys,

 

I've built a few nodes over the years, with PC's, Thin Clients, and now the
Pi3. I have three Pi3 nodes running nicely, but the one I'm currently
working on has me foxed.

 

The problem is "gapping" on receive audio. When in talkthrough, there are
very short but unmissable breaks in the incoming audio. Even on an
unmodulated carrier, one can hear short silences in the background noise.
There are sometimes no gaps for several seconds, other times there are two
or three breaks per second. There is no obvious pattern and they are
somewhat erratic. It doesn't seem to matter if there's audio present or not,
but a tone on the incoming signal makes the issue really obvious.

 

Link audio is fine as are Alison's chants, it's just local RX audio. Reports
indicate that a remote node can hear these gaps as well.

 

I connected my CM108 dongle to a recently retired node computer - a Wyse
Thin Client PC running Limey Linux - and it was flawless with no gaps and
good quality. When re-connected to the Pi, there are the gaps again. The
only difference I can find between this new node and previous pi-based ones
is that I'm using WiFi on this one; the others being hard-wired. (If anyone
can suggest how to get WiFi working on Limey, that would do nicely!)

 

I've tried SimpleUSB and "full fat" USB, and also tried different variations
of carrierfrom and ctcssfrom in USBRadio.conf but I cannot discern a
difference in behaviour regardless of the configuration.

 

I'm tempted to get an image from one of my other nodes and plug it in to
this one to see if that makes a difference.

 

Has anyone had this issue and what was the solution?

 

David - GD4HOZ

 

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