----- 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@gmail.com absi.joey@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
For some reason the hackrf doesn't seem to get a proper sync on the CC. Here's the cmd for rx.py: ./rx.py --args 'hackrf' -N 'RF:0,IF:40,BB:50' -S 8000000 -f 143.385e6 -P datascope -T trunk.tsv -D fsk4 -q 0 2> stderr.2
Here is the datascope (img: Https://ibb.co/zbxB1kH)
I tried with a rtl-sdr dongle on the same antenna and I easily got sync on the frequency (img: Https://ibb.co/g9xnfYH) Here is the gqrx scope of the hackrf (img: https://ibb.co/FBLdMHC)
Thanks
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absi.joey＠gmail.com -
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