[App_rpt-users] PI3 Audio Gaps

[David Osborn]

Thanks for the input, Bob.

 

I’ll poke around some more and see what comes up, but any clues would still be welcomed form the group. This was a fresh-out-of-the-box Pi, as well!

 

Cheers

 

David

 

From: Bob Pyke [mailto:k6ecm1 at gmail.com] 
Sent: 08 July 2018 14:09
To: Users of Asterisk app_rpt
Subject: Re: [App_rpt-users] PI3 Audio Gaps

 

I don’t know the answer, but my thought process came to where your’s did. As I read, the impression that built in my mind is,  it is either a hardware problem (read that as processing throughout or USB hardware in the Pi), or software. Your thought to try a memory card from another and working node is, to me, a good idea. You may want to expand that thought to swapping out the RPi. In the past, I have had what I believe are USB related issues, where the hardware problem couldn’t be found using one build, but easy to trouble shoot using another. (Sigh!) was it the Duuuude who used to say, “friends don’t let friends use USB.?” :-)

Thanks,

Bob

K6ECM





Sent from iPad

 


On Jul 8, 2018, at 4:49 AM, David Osborn <david.osborn at manx.net> wrote:

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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