[op25-dev] P25 P2 corrupted audio?

Brian Rak dn at devicenull.org
Tue Apr 14 15:15:43 UTC 2020


Thanks, that was it!

On Tue, Apr 14, 2020 at 11:07 AM <wllmbecks at gmail.com> wrote:

> Brian,
>
>
>
> Phase-I FDMA LSM (Simulcast) and Phase-II TDMA systems require the CQPSK
> demodulator option.   Change your command line from *(-D fsk4)* to *(-D
> cqpsk), *then
>
> add  *(-V) *to enable the vocoder that compliments  the *(-2)* Phase-II
> TDMA option.
>
>
>
> Bill, WA8WG
>
>
>
>
>
> *From:* op25-dev <op25-dev-bounces at lists.osmocom.org> *On Behalf Of *Brian
> Rak
> *Sent:* Tuesday, April 14, 2020 8:24 AM
> *To:* op25-dev at lists.osmocom.org
> *Subject:* [op25-dev] P25 P2 corrupted audio?
>
>
>
> 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/1086fe103f751be9103a86496b46709a/raw/920fa584beab0ff3ae7f0735fe6a6750023440d3/gistfile1.txt
>
>
>
> 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?
>
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