[Scan-DC] Prince William County issues

[Jeff Krauss]

The Prince William system (call sign WPHP905)
http://wireless2.fcc.gov/UlsApp/UlsSearch/license.jsp?licKey=1301462
is licensed for these emissions: 8K10F1D, 8K10F1E, 8K70D1W, 16K8F1E, 9K80D7W

Here is what they mean:
8K70D1W- P25 Linear Simulcast Modulation
8K10F1E- P25 Phase I C4FM voice
8K10F1D- P25 Phase I C4FM data
9K80D7W- P25 2-slot TDMA (Harmonized Differential Quadrature Phase 
Shift Keyed modulation - H-DQPSK)
8K10F1W- P25 Phase II subscriber units (Harmonized Continuous Phase 
Modulation - H-CPM)
16K8F1E - Encrypted Quantized Voice

So they may be using LSM.  If so, you are receiving simultaneous 
identical transmissions from different towers that are interfering 
with one another at your receive site.  You should try receiving at 
other locations, including inside PW County near one of their tower locations

Their tower locations are here:
http://wireless2.fcc.gov/UlsApp/UlsSearch/licenseLocSum.jsp?licKey=1301462



At 09:12 PM 7/3/2015, D.J. wrote:
>I live in Warrenton (Fauquier County) Just about 7 miles or so west 
>of the Prince William County line.
>
>D.J.
>
>On Jul 3, 2015, at 8:50 PM, Jeff Krauss <jeff at krauss.ws> wrote:
>
>Does Prince William use LSM Simulcast?
>Does D.J. live inside PW County or outside?
>
>I live in Rockville and can't receive Fairfax County, even though 
>the signal is strong.  But the multiple near-equidistant transmit 
>sites interfere with one another.  When I drive over into Fairfax, 
>no problem receiving because I'm closer to one transmit site than the others.
>
>
>At 08:00 PM 7/3/2015, Alan Henney wrote:
> > Dayton Hamvention 2015
> > Any advice for D.J.?
> >
> > From: D.J.
> > Sent: Saturday, June 27, 2015 8:43 AM
> > To: Alan Henney
> > Subject: Prince William County issues
> >
> > Well it all started a few weeks ago. Not hearing much at all 
> anymore on Prince William except analog fire and rescue dispatch 
> and Manassas City PD and Manassas Park PD. I have four scanners and 
> they all went silent including one Phase 2. Apparently Radio 
> Reference still has nothing updated in their data base. Sometimes 
> things kind of suddenly will sound normal on Fire/EMS and Prince 
> William Co PD and the can be heard on the P25 then after a few 
> hours or maybe minutes completely silent again. Three of my four 
> scanners are non phase 2 and even though I have the Phase 2 
> frequencies programmed on the non phase 2 I do hear the traffic on 
> them anyway on those non Phase 2 frequencies when that sudden 
> traffic is heard.   My only phase 2 scanner (BCD436 HP) again 
> appears to work only at times then silent again but the other non 
> phase 2 have the same intermittent traffic anyway also.  I found a 
> brief discussion about it on Radio Reference concerning PW County 
> is in the process of reban
> > ding and reception issues and some are saying they are not really 
> phase 2 yet saying TDMA vs something but it's not clear.  I thought 
> I would ask if you had any knowledge about the issue because it is 
> very confusing what's going on there.
> >
> > 
> http://forums.radioreference.com/virginia-radio-discussion-forum/312029-prince-william-county.html
> >
> > Sorry to bother you but thanks for your help.
> >
> > D.J.
> >
> > On Jun 27, 2015, at 12:43 AM, Alan Henney <alan at henney.com> wrote:
> >
> >
> > From: D.J.
> > Sent: Tuesday, June 23, 2015 9:16 PM
> > To: Alan Henney
> > Subject: Re: Dayton Hamvention 2015
> >
> > Hey Alan question.
> >
> > I didn't see anything about this on your site but I've been 
> monitoring Prince William County for a long time. Recently things 
> have gone silent especially on the fire and rescue side. I notice 
> they did upgrade to a Phase 2 system but I have a Phase 2 scanner 
> and carefully downloaded the Phase 2 programming on my BCD436HP but 
> I still don't hear anything on those channels despite hearing 
> plenty of traffic when using the scanner apps available for my phone.
> >
> > Do you have any idea what the problem might be?
> >
> > Thanks.
> >
> > D.J.
> >
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