[op25-dev] OP25 for noobs by a noob (long)

'WA8WG' wa8wg@centurytel.net [op25-dev] op25-dev at yahoogroups.com
Wed Aug 9 22:48:27 UTC 2017


Dick,

 

If you still don’t get any audio once you have implemented the suggested changes to your scope.py command line and trunk.tsv files, then it’s very likely you don’t have the correct NAC for the Plano PAWN simulcast system.   I would suggest installing Unitrunker on a Windows box but it does not support hackrf to my knowledge.   It does support the RTL-SDR, Airspy, and raw discriminator audio.    Unitrunker would provide you with the system NAC needed for your trunk.tsv file to run

Scopey.py.    Short of that, do you have a consumer scanner that has p25?    Some of the consumer p25 scanners have a diagnostic or analyze function that will also display the NAC when manually tuned to the control channel.  The GRE PSR500/600 and equivalent Radio Shack scanners have this feature as well as the Whistler P25 scanners.   Perhaps a friend has one of these units if you don’t have one yourself to use in determining the NAC.

 

On another note, I somehow got the impression that you are running OP25 (scope.py) under Linux on Virtualbox.    There are a couple of settings on your Virtualbox machine that make a difference in how OP25 runs as well.   Feel free to private email me directly if you would like to discuss how I have my Ubuntu 14.04 + OP25 setup on Oracle Virtualbox.

 

Bill

 

William G. Becks, WA8WG

N7027 Shady Lane Circle

Porterfield, WI 54159

 

Telephone: 715.735.0131

Email:  <mailto:wa8wg at centurytel.net> wa8wg at centurytel.net

 

From: op25-dev at yahoogroups.com [mailto:op25-dev at yahoogroups.com] 
Sent: Wednesday, August 9, 2017 12:28 PM
To: op25-dev at yahoogroups.com
Subject: Re: [op25-dev] OP25 for noobs by a noob (long)

 

  

Bill

   Thank you for the feedback, and the -I hw:1,0 was an attempt to force the audio directly to the hardware device. As for the NAC,

I just used what was in a previous line as I couldn't find this information on Radio Reference. I'll update the tsv file and keep working

on this. Thanks again.

 

  _____  

From: "'WA8WG' wa8wg at centurytel.net [op25-dev]" <op25-dev at yahoogroups.com>
To: op25-dev at yahoogroups.com 
Sent: Tuesday, August 8, 2017 8:20 PM
Subject: RE: [op25-dev] OP25 for noobs by a noob (long)

 

  

Dick,

 

It appears that you have configured scope.py to monitor the Plano PAWN Simulcast system.    I am not up on hackrf, but I would try removing the (-I hw:1,0) from your scope.py command line. 

 

python scope.py --args 'hackrf' -I hw:1,0 -g 65 -f 852.675e6 -N  'RF:14,IF:32,BB:26' -o 50e3 -T trunk.tsv -V -v 0

 

Then edit your trunk.tsv file to replace the offset (0x1E2) with a “0” then then fill in the center frequency with a value of 852.225 that is at the mathematical center of the Plano PAWN control channel and voice trunk frequencies.   I am assuming that

you have verified the NAC 0x3bc is correct?

 

Bill

 

 

William G. Becks, WA8WG

 

Email: wa8wg at centurytel.net

 

From: op25-dev at yahoogroups.com [mailto:op25-dev at yahoogroups.com] 
Sent: Tuesday, August 8, 2017 9:48 AM
To: op25-dev at yahoogroups.com
Subject: Re: [op25-dev] OP25 for noobs by a noob (long) [2 Attachments]

 

  

[ <https://mg.mail.yahoo.com/neo/launch?.rand=e08er1aqvsfjg#TopText> Attachment(s) from Dick Wad included below] 

FM/Bill/all

   Didn't get the time I wanted last weekend but was able to perform the op25 reload as you laid out and then hit issues with the hackrf not being detected by the op25. Gave me an error that no device was found even though the syslog was reporting it was seen and configured, and I could run the hackrf_info command and get information from it. So I went back to the configuration that was working....now, I thought I read somewhere, and i have read more working on this than I have in a long time, is that the audio is streamed at 96khz? from the scope views that I have seen, the op25 is working but still no audio. I wasn't able to move the sample rate up on my virtualbox install, but was able to get it changed on my laptop that i had also installed gqrx on. I have attached the scope.py file and what tsv file I have created to this as well in hopes I can get any help. I am focused on the audio portioning right now. Appreciate the help too.

 

  _____  

From: "flkmrz at gmail.com [op25-dev] <mailto:flkmrz at gmail.com%20[op25-dev]> " <op25-dev at yahoogroups.com>
To: op25-dev at yahoogroups.com 
Sent: Sunday, August 6, 2017 7:15 AM
Subject: Re: [op25-dev] OP25 for noobs by a noob (long)

 

  

Hi Kristof,

No intrusion -- the more the merrier.

If you could get a script working to get info from RR, that would be great.  While you're at it, if it would do the talkgroup id's too that would be very handy.

Regards,

fm

 

 



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