Wow Steve, That is interesting, I guess I could find internal gated audio and skip the DSP for all the MSF5000s. I would have thought the COS/PTT controls would be time synced or in stream "ie:inband" with the audio packets so PTT-On would lead and PTT-Off would follow. I assumed that last audio packet had an "end-transmission" bit inside. I guess adapting existing phone controls with real-time PTT/COS is a bit tricky... Thanks for the clarification. Actually this may bring to light another issue. Does my problem show that the local RX DSP is not identifying the mobile's reverse burst phase shift? Should it? (Mobile = Spectra) 73's -----Original Message----- From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Stephen Rodgers Sent: Saturday, January 22, 2011 10:23 AM To: app_rpt-users@ohnosec.org Subject: Re: [App_rpt-users] Local squelch tail problem clarification. (copy of message to Ken) for comment. On 01/22/2011 09:42 AM, Peter Elke wrote:
From: Peter Elke [mailto:pete.elke@esquared.com] Sent: Saturday, January 22, 2011 3:26 AM To: Ken Subject: RE: [App_rpt-users] Location dependant squelch tail?
Hi Ken,
What I meant to get across was... There is a squelch tail when the local mobile unkeys (before the hang time) but you only hear it if you are monitoring the local node's transmit frequency. Remotely connected stations don't hear the tail, only a soft click or nothing from the same transmission.
The local repeater transmitter dropping does not cause a tail if the mobile is in PL decode.
I thought this was just strange, so much so that I sound ignorant reporting it...
73's Pete (WI6H)
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Packet propagation across an the Internet and the use of jitter buffers in Asterisk causes this. On a network-based connection, the unkey control message is reaching the far end before the audio packets containing the squelch tail noise. On a local connection, the audio packet delay is much less. I suppose a delay could be added to the local audio packet stream, but this impairs full duplex operation even more as the delay there is already annoying enough. Steve. WA6ZFT _______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users