Odd problem with SDRsharp when controlled by Unitrunker.

[djfrerick]

Using Version 1174 SDRsharp with Unitracker on a local P25 system.
Signal is good and locked, receiver is calibrated. When I enable tracking in
SDRsharp it runs perfectly for about 5 minutes then stops on a random channel
and not the control channel. After checking the settings, SDRsharp is somehow
shifting from NFM to AM causing the trunking to stop.

I am running a winXP system with one USB dongle. If I manually put sdr on a
channel and disable tracking it will decode the p25 audio perfectly.

Any help would be appreciated. I can listen to the dispatch but I would like
to have the scan feature work correctly.

 

[SCPD]

Get a second receiver and dedicate it to the control channel.

As for changing SDR# from FM to AM - that's the SDR# plugin. Which trunking plugin are you using? There are three - Bob Rich (original), Zefie, and "devicenull". I think Zefie's is considered most current.

SDRSharp UniTrunker Support

The Midnight Channel - SDRSharp Trunker Plugin Mod Official Website

You may find an answer here:

http://forums.radioreference.com/software-defined-radio/265660-sdr-trunking-has-been-updated.html

 

[djfrerick]

I am using the Zefie plugin.
I am getting second receiver tomorrow, and will take your advice.
Thanks for the quick reply.

 

[tylerwatt12]

set your park to the CC

also make sure the scanner plugin isn't running

 

[djfrerick]

I do have the correct control channel set in unitrunker.
I solved the jumping from NFM to AM.
It seems it does not like the Shift function so I recalibrated the receiver
with just the ppm control.
But it still stops trunking on random channels within the group,not returning to the control channel.
If I manually set it back to the control channel it resumes scanning.

 

[tylerwatt12]

Is 'delay re-tune until call completes' unchecked in SDR#?
When you say "I do have the correct control channel set in unitrunker."
Does that mean, in the 'debug' receiver settings, your park is set to the CC?

Another tip, if you're decoding P25 digital voice, set your mode to WFM and volume to max. It shouldn't make it sound better on paper, but it somehow helps DSD with decoding.

 

[djfrerick]

yes, delay retune is unchecked.
I have the control channel frequency set in the debug receiver.

will try the tip.