[Scan-DC] Problem with Arlington County P25 system on Uniden 346XT

[Greg Danes]

That sounds about right to me. But what do I know :)


On Sun, Nov 24, 2013 at 5:35 PM, Mike Agner <ka3jjz at comcast.net> wrote:

> Well there's one really simple answer here - the 346XT can't handle P25 -
> it's an analog only scanner. Now if you mean the 396XT, that's a horse of
> 'nother color.....
>
> Be that as it may, that system is simulcast - and if it's using LSM like
> so many systems that are popping up lately, the current crop of digital
> scanners is going to have problems decoding it
> well. The wiki at RR has a very detailed article on this very subject
>
> http://wiki.radioreference.com/index.php/Simulcast_digital_distortion
>
> This is an issue very familiar to folks wanting to listen to Baltimore
> city or Baltimore county. As an example when I drove up to Woodlawn where I
> used to work, I had to make sure my attenuator
> was on, as I was receiving sigs from at least 3 towers at the same time
> (this is on a 396T).  It wasn't real clear all the time, but it worked -
> mostly.
>
> Now there was a firmware upgrade to the 396XT that supposedly improved LSM
> decoding...
>
> http://info.uniden.com/twiki/pub/publish/BCD396XTFirmwareUpdate.html
>
> Be sure to try to use the settings as defined in version 1.-06 first. You
> should know that it's a very catch as catch can type thing. One set of
> settings might work well for one person, not so well for another. It's
> virtually impossible to quantify simply because the RF environment can be
> completely different for each (one might be using his radio mobile with a
> duckie, another with a gain 800 Mhz antenna in a fixed
> location...yada...yada...). You're going to have to fiddle with it a lot,
> and accept the compromise performance.
>
> And then there's this...
>
> http://forums.radioreference.com/uniden-scanners/267424-
> loose-open-squelch-improves-lsm-simulcast-reception.html
>
> Are there any real solutions? Probably not until the scanner manufacturers
> (now just Uniden, and Whistler now that GRE is out) develop new firmware
> that can properly handle the distortion issue and LSM.  And before anyone
> asks, I have no idea whether the new 436/536 will handle this either. I
> suspect that the folks that are lucky enough to do beta testing signed NDAs
> to prevent them from talking about technical issues in public.
>
> Not the answer everyone wants to hear, but the only one available, I'm
> afraid...Mike
>
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-- 

Gregory S Danes
8101 Orville st.
Alexandria, VA 22309
danesgs1 at gmail.com
Phone. 571-216-2126