[op25-dev] New member question

Chuck Kelsey wb2edv@roadrunner.com [op25-dev] op25-dev at yahoogroups.com
Sun Mar 26 20:04:21 UTC 2017

Thanks for sharing Tom.

I gave a listen for a short period. A lot of the traffic was rather 
difficult for me to understand. There were times I could tell what was 
being said, other times not so. Probably about 50/50.

Our system is currently still patching digital over to an analog 
channel, so it's a mix of both depending on the user. For some reason 
the digital traffic is a lot easier to understand.  90% of the time it 
is copyable. The remaining 10% is lost to the technology and I can't 
pull it out with my ears. The stuff still analog is, well, absolutely great.

The Uniden scanner I had for a short while (programmed it for a friend) 
was pretty dismal on digital.


On 3/26/2017 3:38 PM, Tom Hayward tom at tomh.us [op25-dev] wrote:
> 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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