op25-dev January 2025

op25-dev@lists.osmocom.org

2 participants
2 discussions

Fw: TX Support
by ikjtel 07 Jan '25

07 Jan '25

----- Forwarded Message ----- Sent: Tuesday, January 7, 2025, 1:50:23 PM ESTSubject: Re: [op25-dev] TX Support Should be straightforward to sectionalize this problem but will need your help - we'll assume for the moment there's been no regression (bug introduced). If your HackRF has not been stabilized (using GPSDO or other), I'd guess there could be a frequency-offset error between TX and RX - probably sufficent to cause RX failure. Can you run one of the RX apps (rx.py or multi_rx.py) and enable the "datascope" (eye pattern diagram), and attach a copy of that plot... Max On Tuesday, January 7, 2025, 12:26:32 PM EST, absi.joey(a)gmail.com <absi.joey(a)gmail.com> wrote: Hey there, I was testing the P25 Tx support of OP25 with a hackrf but I am encountering strange behavior. I am able to transmit "something" with the hackrf using the cmd: ./dv_tx.py -p p25 --args 'hackrf' -f ./test.wav -Q 145000000 -q 0 --gains 'RF:0,IF:20' On SDR# (img: https://ibb.co/C58Q592) I am getting signal so something is being transmitted but the squelch won't open. Even when disabling squelch I am getting a signal (that seems distorted/noisy), check at DSD+ Source Audio window (img: https://ibb.co/mJJy3J0). I tried lowering the gain but the signal is still "noisy" so I figured I would ask the experts over here. Thanks

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TX Support
by absi.joey＠gmail.com 07 Jan '25

07 Jan '25

Hey there, I was testing the P25 Tx support of OP25 with a hackrf but I am encountering strange behavior. I am able to transmit "something" with the hackrf using the cmd: ./dv_tx.py -p p25 --args 'hackrf' -f ./test.wav -Q 145000000 -q 0 --gains 'RF:0,IF:20' On SDR# (img: https://ibb.co/C58Q592) I am getting signal so something is being transmitted but the squelch won't open. Even when disabling squelch I am getting a signal (that seems distorted/noisy), check at DSD+ Source Audio window (img: https://ibb.co/mJJy3J0). I tried lowering the gain but the signal is still "noisy" so I figured I would ask the experts over here. Thanks

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