[Scan-DC] Prince William County issues

Mon Jul 6 09:47:30 EDT 2015

I hear PWC PD and Fire on the live scanner feed, so I know PWC is working.  I used to have no issues receiving them but now, they are unable to be received at my location in Manassas.  I am using both a GRECOM PSR-800 and a RS Pro-668 with a discount antenna, neither get PWC now.  

I have tweaked my settings, such as DSP level to 52, ADC and DAC to 2+, as well as changing the data decode thresholds to 15 and 95.  

I am running out of things to try.  Any suggestions?

> On Jul 6, 2015, at 8:03 AM, Jeff Krauss <jeff at krauss.ws> wrote:
> 
> 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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