OP25 op25 assistance with control/voice channels in configs

[sean_]

Hello,

I'm requesting help with knowing which control channels to use in the op25 (boatbod version) for my area:

Southern Nevada Area Communications Council (SNACC) Trunking System, Las Vegas, Multi-State

Southern Nevada Area Communications Council (SNACC) Trunking System Profile

www.radioreference.com

---Hardware components----

Computer

NAME="Linux Mint"
VERSION="22.2 (Zara)"
ID=linuxmint
ID_LIKE="ubuntu debian"
PRETTY_NAME="Linux Mint 22.2"
VERSION_ID="22.2"
HOME_URL="https://www.linuxmint.com/"
SUPPORT_URL="https://forums.linuxmint.com/"
BUG_REPORT_URL="http://linuxmint-troubleshooting-guide.readthedocs.io/en/latest/"
PRIVACY_POLICY_URL="https://www.linuxmint.com/"
VERSION_CODENAME=zara
UBUNTU_CODENAME=noble

SDR Dongle
Nooelec RTL-SDR v5 SDR

Antenna
Diamond Antenna Dual-Band HT Antennas RH77CA

Antenna base
WT60 Magnetic Mount Base


----------

I installed op25 from git source without any complications, and I can run the app with this:

./rx.py -l 'http:0.0.0.0:8000' --args 'rtl' --gains 'lna:49' -T trunk.tsv -q -1 -2 -S 1000000  -P symbol -o 50000

$ cat trunk.tsv
"Sysname"       "Control Channel List"  "Offset"        "NAC"   "Modulation"    "TGID Tags File"        "Whitelist"     "Blacklist"     "Center Frequency"
"P25 SYSTEM"    "852.050"       "0"     "0"     "cqpsk" ""      ""      ""      ""
"P25 SYSTEM2"   "852.800"       "0"     "0"     "cqpsk" ""      ""      ""      ""

Problem is I don't see any data appear on the webpage. There is activity on the plots, but I don't know what should appear.

I've also tried with boatbod's multi_rx.py and enabled http but I still don't see any data coming in.

$ ./multi_rx.py -c p25_single_rtl_example.json

I know my sdr is fine, because I can use gqrx and tune to a FM station, and I installed rtl_airband from src and it's able to receive airband traffic.

I think I'm just confused on how to establish the control channels and voice channels.

Any suggestions?

Thanks!

 

[imonitorit]

I had boatbod version running on an older version of linux mint. In your trunk.tsv file, double check the correct location for "cqpsk" it should line up under Modulation. Also, I'm not sure if the NAC (46B) is required as well.

 

[sean_]

Thanks for the reply, but i don't think that's it. I updated the file and still see waiting for data. Also, the trunk.tsv file on the git repo isn't different than how mine was.

https://raw.githubusercontent.com/boatbod/op25/refs/heads/master/op25/gr-op25_repeater/apps/trunk.tsv

What i see on the webpage: