[op25-dev] New member question

Tom Hayward tom@tomh.us [op25-dev] op25-dev at yahoogroups.com
Sun Mar 26 19:38:12 UTC 2017


On Sun, Mar 26, 2017 at 7:49 AM, Chuck Kelsey wb2edv at roadrunner.com
[op25-dev] <op25-dev at yahoogroups.com> wrote:
> Tom,
>
> Are you listening to P25, phase 2 simulcast? If so, how are your results and what hardware are you using/
>
> Chuck

Yes. Have a listen yourself:
http://allstar.kd7lxl.hamwan.net:8000/

It's monitoring two talkgroups, so if it seems like it's cutting
between two conversations that is why. Compared to my Uniden scanner
there is a lot lower latency at the beginning of each transmission
(the Uniden will miss the beginning of the transmission).

Hardware is
- 1090 MHz ADS-B antenna at about 20 ft.
- SMA tee (other side goes to the ADS-B receiver). This messes up the
impedance, but not really a big deal for receive.
- NooElec RTL-SDR with TCXO https://smile.amazon.com/gp/product/B01HA642SW/
- Intel NUC DN2820FYKH with Intel Celeron N2820 (I know I said I
started with a VM, but I transitioned to the Nuc for permanent
installation.)

Biggest outstanding issue I want to correct is audio level
equalization / compression. The dispatch consoles seem to a lot hotter
than most of the subscriber radios. I have not been able to get LADSPA
dysonCompress to work.

Tom
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