op25-dev

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307 discussions

rx.py Airspy MASTER GAIN Setting option?????

by op25＠zellners.com

Trying to test out an AIRSPY R2 and the signal level v. an RTL is not even close. I've got -N options for LNA, MIX, IF, but what is the option for the MASTER GAIN? I've tried MAS, MASTER in the -N option, no change in the signal. I've tried -g as well no joy. Example: ./rx.py --args 'airspy' -N 'MASTER:50,IF:10,MIX:5,LNA:50' -S 2500000 -f 769.55625e6 -v 7 -T P25PC.tsv -q 2 -V -2 -U -x 2 2>> airspy.log ./rx.py --args 'airspy' -N 'IF:10,MIX:5,LNA:15' -S 2500000 -f 774.55625e6 -v 7 -T P25PC.tsv -q 2 -V -2 -U -x 2 2>> airspy.log What is the CORRECT method to set the MASTER GAIN of the Airspys, using something else its set to 14 for a good signal. Thanks.

4 years, 10 months

OP25 beginner

by Patrick Schlott

Hello, I'd like to get started with a build of OP25 on a Raspberry Pi 3B, with the intention of using it to transmit and receive P25 on a mobile radio. I have some experience building projects from the source, but the current install instructions do not work: https://osmocom.org/projects/op25/wiki/InstallInstructionsPage I'm not sure if the git link is wrong and I don't want to use svn as that's an older version of the software. Apologies if this is a beginner question, but this project interests me very much, and I'd like to help in any way I can, if only minimally. Respectfully, -Patrick Sent with [ProtonMail](https://protonmail.com) Secure Email.

4 years, 11 months

Hey everybody!

by indie

Hello everyone! I used to use OP25 circa 2013. Are you all still active on here?Sent via the Samsung Galaxy S8 Active, an AT&T 5G Evolution capable smartphone

5 years, 2 months

P25 P2 corrupted audio?

by Brian Rak

I've been trying to use OP25 to listen to a Project 25 Phase 2 system, and so far all I've managed to get is weird corrupted audio out of it. It almost sounds like the audio isn't being decoded at all, and it's just playing me the raw bit stream. I'm using: # ./rx.py --nocrypt -f 770081250 -N 'LNA:47' -2 -T trunk.tsv -l http: 192.168.5.134:4445 -v 8 --args 'rtl' -S 274000 -w -W 192.168.5.224 -q 2 -D fsk4 (have tried with and without the fsk4). I do see debug output that seems to indicate it's following the channel properly: https://gist.githubusercontent.com/devicenull/1086fe103f751be9103a86496b467… I'm listening in on a remote device with vlc: vlc.exe --clock-jitter=500 --network-caching=0 --demux=rawaud --rawaud-channels 1 --rawaud-samplerate 8000 udp://@:23456 The machine I'm running OP25 on doesn't really have a sound setup (it's a server, no GUI or speakers), so I can't really confirm if the issue is with the sound or VLC. Any suggestions?

5 years, 3 months

slow choppy audio

by Josh Tuel

I'm sorry if this has been asked before but I didn't see it in the archives. Any idea what could cause this slow choppy audio? https://photos.app.goo.gl/BinMZsag9G8nHAmaA I've played with the sampling and the my Mixer: balance (on Gnupot) is under 100. Thanks - Josh / N0EG

5 years, 4 months

H-DQPSK support?

by James Qiu

Hi, I'm new to OP25. I'm wondering if and when OP25 will support H-DQPSK demodulation. It's specified in Phase II of P25. I tried -2 option, but it didn't work. I used Anritsu LMR test box as the source. Thanks James

5 years, 4 months

OP25, python, and the upcoming *buntu 20.04 releases - heads up and FYI....

by op25＠zellners.com

As part of my moves to resolve the cmake issue and testing 20.04 for new boxes for OP25 and other stuff.. ... Probably a bad idea to try to tackle both at once, but hey may as well go big! Well... there are some issues... *buntu and/or python are killing Python 2.7. While its in the repos now.. the info I am being advised it likely won't be in the release ... Neither of the python packages seem to be setting up the proper ENV vars, symlinks etc... but thats another issue... BUT GNURadio in the repo is setup for Python 3.7..so when its installed all the GNUR radio stuff is in the python3.7/ path, not 2.7/ For OP25-boatbod is this Python 3.7 compatible?????? If not, I am guessing theres going to be a problem as it likely won't run on 20.04 releases if the 2.7 packages are really removed.. and ONE is missing already (but its still early), python-waitress (the actual program DEB Is missing, but the doc DEB is there?? (Again we are still alpha early)), I can fix it and bring in the Eoan/19.10 one with a little hackery... I can get things to compile but I don't think its complete in the least.. and then attempting to run rx.py get the unable to import gnuradio.. as its not in 2.7 and some ENV var issues too... I'll look at the EVN vars to make it point to 2.7 properly like <20.04 but I am not sure thats going to fly as its all in 3.7 paths... see: :/usr/bin$ python3 Python 3.8.2rc1 (default, Feb 12 2020, 00:06:56) [GCC 9.2.1 20200203] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import gnuradio >>> quit(); versus: :/usr/bin$ python Python 2.7.17 (default, Jan 21 2020, 23:28:51) [GCC 9.2.1 20200117] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import gnuradio Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named gnuradio >>> So this is a heads up that theres likely to be a lot more noise about op25-boatbod not installing/compiling etc...or at least possibly have to go to 19.10 via LXC container.. I'll keep you advised if I can make any progress... the cmake issue is resolved but it means going back to 3.10.. I couldn't get 3.12.x to work at all. cmake was pulled from source and compiled.

5 years, 4 months

OP25 with AGC (automatic gain control)?

by James Qiu

Hi Currently I'm using a command line like: ./rx.py --args 'rtl' -N 'LNA:49' to adjust the LNA gain of the RTL-SDR. Is there a way to do AGC? Near me, the 700Mhz channel is really strong, but 800Mhz is really weak. So AGC would be very useful. Also if not easy, what other gain and ranges I can adjust? What's the max value for LNA gain? Thanks James

5 years, 4 months

header intact

by efjoseph＠earthlink.net

header intact

5 years, 5 months

OP25, SDR, DMR, TX

by Владислав Д.

Good evening, Would You kindly to answer a few questions about the OP25 project and how to organize a transmitter with it using SDR devices (RTL-SDR, LimeSDR)? In the creation process of DMR-standard transmitter in the GnuRadio environment, we came across the absence of some necessary blocks: 4FSK modulator, DMR encoder, packet shaper. Inside the OP25 project we found a file that contains some functionality of DMR TX (dv_tx.py), but only in form of code, not as a GRC block. Could you tell us does this file fully implements the TX-side of the DMR system and whether there is an analogue of it, in the form of a GRC block for GnuRadio? We will be very grateful if you can help us sort this out. Yours faithfully, Vladislav.

5 years, 6 months

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