I have seen this kind of thing between servers at the same location - without an RTCM - when something was causing some latency issues on my LAN.

in iax.conf I found the default resyncthreshold= was 1000 ms so I reduced it.

I have since fixed the problem with the LAN, but still run resyncthreshold at 300 ms to avoid ever building up a lot of delay in the system.

73

Ken

From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Alan Adamson
Sent: Tuesday, June 26, 2012 7:55 AM
To: app_rpt-users@ohnosec.org
Subject: [App_rpt-users] RTCM Question

Anyone else noticed this?  Maybe my user radio is just a fast switcher.

I use and RTCM in conventional mode at my repeater to be the interface for it and Allstar.   If I don't remember to keep the PTT held for about a second after I finish talking, as soon as I release the PTT, I get about 1 second (it's actually a smidge shorter than that) of the last few things I said on the air.

I'm pretty sure this *repeat* is because of the approx 1 second delay that the RTCM instills in the system.  It's about 400ms of startup delay, and about the same of system delays, so the live release of the PTT sees approx 800ms of delayed audio.

If I remember to keep the PTT pressed for approx 1 second when I finish talking I don't see this.  I'm using a commercial radio, so maybe I'll need to see about a programmed setting to do that for me automagically.

Just wondering if others are seeing it as well or if I just have a fast switcher.

Alan