[App_rpt-users] Transmit audio delay

[Thor Wiegman]

Ross,

Thanks for the reply.  I've had this happen to me on two different 
configurations.  The issue here is with the radio interface.

One is a simplex UHF application using a Motorola GM300 mobile (although 
I have also experienced the same problem using GE MVS and GE MLS2).  
When I receive on an Alinco DJ-596, Wouxun, GE MLS2 or another GM300, I 
notice that I the first bit of audio is sometimes clipped.  If I set any 
of those radios for carrier squelch (as opposed to CTCSS) the problem is 
less noticable.  It seems to me there might be some brief delay in the 
receiver decoding the CTCSS. I've looked at the transmitted CTCSS and it 
is at 500 Hz modulation and a nice clean sine wave.

Where I really notice the problem is in a remote base configuation. I'm 
using a GM300 VHF for this but the issue would happen with any radio.  
In this application I am using the radio to access a repeater system in 
the next county.  That repeater, when initially keyed from idle, can 
take as long as 250 mS to begin to pass audio from when it first sees 
carrier and CTCSS (hey, it was free an it works so I'm not 
complaining).  My hope was to adjust a delay buffer here such that my 
remote base would transmit but hold audio for 200 ms or so to allow the 
outbound path to come alive and stabilize before putting out the audio.  
It's not a big deal and is pretty much "normal" operation, but I figured 
that a small delay of the audio here would clean things up a bit.

73 DE Thor
Operator of N7JCT