New Dinwiddie System

[Dinwiddie]

I just now got an account. Dinwiddie has just gone hot with their new system. Testing went on last August. I think its a mixed mode system. I know it is all VHF. When they were testing for coverage in Aug. I picked up the following 3 freqs. 154.4400(digital only, and indicated as P25 signal on my BC296d, I'm pretty sure this is the control channel) and 155.6350 as analog which always transmitted at the same time as 154.4400. Also picked up 153.7500 as analog during testing. I could moniter the digital transmission during testing, but now that they've gone hot, I get only the buzzsaw sounds on 154.4400. Can't figure out how to program the system in my BC296d. They still have analog 155.9400 analog for Fire/EMS but with new tone out sounds. Any help on programing? Thanks

 

[FPO703]

The frequencies licensed are 154.4375, 155.6375, & 151.0850

They are all APCO-25 conventional. They're not trunked. You should be able to just plug the frequencies in and go from there.

 

[Dinwiddie]

The frequencies licensed are 154.4375, 155.6375, & 151.0850

They are all APCO-25 conventional. They're not trunked. You should be able to just plug the frequencies in and go from there. Thanks, working on it. This is a large generally rural county with limited funds. I never thought they needed any real extravagant systems, but they had a lot of coverage problems with their low band 1950's system. I may have some system items not right on this new Bearcat. Thanks for the freqs. Policecall is way behind, and I can't find the freqs on the net.

 

[FPO703]

Try this link. This is for the new frequencies

http://gullfoss2.fcc.gov/cgi-bin/ws...d=19&callsign=WPZV812&application_id=

 

[fmon]

http://wireless2.fcc.gov/UlsApp/UlsSearch/licenseFreqSum.jsp?licKey=2392589

Or this source.

 

[Dinwiddie]

Nothing but buzzsaws

I've tryed all the new Dinwiddie freqs in my BC296d, and the only thing I get is buzzsaws on 151.0850 and 154.4375. It's not the scanner as I have Chesterfield/Colonial Heights 800 Apco-25 systems and Hopewells 800 system on different banks and they work just fine. The Sheriffs dept. has disappeared, but I still get Fire/EMS on 155.9400. Any ideas???

 

[haloncloud]

Try adjusting the audio setting.

Haloncloud

 

[fmon]

The frequencies licensed are 154.4375, 155.6375, & 151.0850

They are all APCO-25 conventional. They're not trunked. You should be able to just plug the frequencies in and go from there.

The second freq is 155.6325.

I've tryed all the new Dinwiddie freqs in my BC296d, and the only thing I get is buzzsaws on 151.0850 and 154.4375.

Insure the freqs are not set as trunked.

 

[haloncloud]

A little more detail on adjusting Sound Quality my last post wasn't much.

From Man.

Setting APCO 25 Sound Quality

Each APCO 25 system has slightly different system settings
that control how the audio is digitized. To get the best sound
quality, you need to match as closely as possible the system’s
settings.
To adjust the sound quality:
1. While monitoring a specific APCO P-25 talkgroup, press
the HOLD/MAN key.
2. Press and hold the 9 key. On Line 1 of the screen you will
see SOUND QULTY: 0050 (for example). This shows
the Sound Quality. The lower the level the better the
Sound Quality.
3. To manually set the sound quality, rotate the scroll bar up
or down. As the threshold adjusts in increments of 100 at
the bottom of the screen watch the Sound Quality level
increase or decrease and continue to rotate the scroll bar
until you have achieved the best Sound Quality level.
Notes: • When APCO P-25 signal is not received, SOUND
QULTY: **** appears on the display.

• You must be receiving an APCO P-25 signal to
make this adjustment
A chart showing the Threshold Adjustment Range is listed
below.
4. Once you have adjusted the Sound Quality to the best
possible level, press E.

Press RSM to exit the Sound Quality Adjustment Mode.

Lower Mid Upper
Band Min Default Max Default Min Default Max
800MHz 33 533 1833 1985 2042 3342 3842
UHF 33 633 1833 1985 2042 3342 3842
VHF 330 930 2130 2147 2264 3464 4064

Notes: • To cancel the adjusted threshold level, press
key.
• The adjusted threshold level for the current
frequency can be set back to the default value by
pressing and holding the key.
• When you change the Sound Quality it affects all
other APCO 25 signals in that same band. (UHF,
VHF, or 800MHz).

Haloncloud

 

[Dinwiddie]

Thanks for info Haloncloud. Got all that in the manual, and I've used that to adjust sound quality on Chesterfield, etc, 800 systems. As of now, I have all 8 new Dinwiddie VHF freqs on a separate bank, made sure each one was in conventional, and still nothing but control channel buzzsaw transmissions on 151.0850 and 154.4375. Other 6 on the bank from the FCC list are 153.7475, 155.6325, 156.0375, 156.1050, 156.1575 and 159.0375. I have got a couple of bursts of transmission noise on 156.1050, but other than that, nothing but periodic buzzsaw transmissions from the 2 control? channels. I'm less than 3 miles from the Sheriffs Dept. antenna and the the new main antenna behind Company 1 Fire/EMS, and the Wheelers Pond Rd. antenna, so distance is not the problem at all. Thanks for any more ideas, anyone???

 

[ericcarlson]

As of now, I have all 8 new Dinwiddie VHF freqs on a separate bank, made sure each one was in conventional, and still nothing but control channel buzzsaw transmissions on 151.0850 and 154.4375. Other 6 on the bank from the FCC list are 153.7475, 155.6325, 156.0375, 156.1050, 156.1575 and 159.0375. I have got a couple of bursts of transmission noise on 156.1050, but other than that, nothing but periodic buzzsaw transmissions from the 2 control? channels.

All indications are that the system is not trunked. A control channel would broadcast data continuously but you are reporting intermittent transmissions. The frequencies are probably APCO-25 conventional, which you should be able to receive with the BC296D. The "buzzsaw" sound is typical of APCO-25 digital voice transmissions when listening to them in analog mode.

-Eric

 

[fmon]

Unidens will not filter encryption...I wonder if the noise is encryption? Anyone have a Pro-96?

 

[MOTORHEAD3902]

on a pro96

no problems hearing them from Prince George with a Pro96. Am not getting over-run by buzz-saws at all. All is clear.

 

[Dinwiddie]

Encryption

I think the encryption talk group is very expensive, and the only Apco25 encryption transmissions I've ever heard(encrypted) was Chesterfield County's Detectives unit. I'm still getting nothing but buzzsaw noise transmissions from Dinwiddies' new system. My BC278clt is sitting in the kitchen window buzzing, and still receiving the VSP and the VSP Tac and the low band service 039.5400, etc etc. I still get the Dinwiddie VHF 155.9400 Fire/EMS analog, and the digital 154.4375 buzz when that is transmitting.

 

[brianm]

Re: Encryption

I think the encryption talk group is very expensive, and the only Apco25 encryption transmissions I've ever heard(encrypted) was Chesterfield County's Detectives unit. I'm still getting nothing but buzzsaw noise transmissions from Dinwiddies' new system. My BC278clt is sitting in the kitchen window buzzing, and still receiving the VSP and the VSP Tac and the low band service 039.5400, etc etc. I still get the Dinwiddie VHF 155.9400 Fire/EMS analog, and the digital 154.4375 buzz when that is transmitting.

From the stupid question dept,

You didn't accidently turn off the digital card did you? Are you picking up other digital transmissions currently?

 

[Dinwiddie]

p-25 card

My p25 card is enabled. I pick up the Chesterfield/Colonial Heights and the Hopewell 800mhz apco25 systems just fine.

 

[haloncloud]

I would really look at adjusting Sound Quality. I know you said you adjusted it for Chesterfield and Hopewell but just because you can hear them does not mean you can get Dinwiddie. The only problem is once you adjust Dinwiiddie to clear you probley won't be able to hear Chesterfield and Hopewell. In fact you probley had to pick a happy med. between those two to listen to them there is just a little diffrence to cause problem.

 

[Dinwiddie]

3 cheers for Haloncloud

I owe you a box of cigars. Thats what it was. I had to turn up the sound quality much higher than the 800 systems. The Sheriffs Dept. is using 151.0850. I have to tweak it some more. They're transmissions are few and far between except on weekend nights. Thanks a whole bunch.

 

[Dinwiddie]

Back in the Game

151.0850 is Digital Police, 154.4375 is digital Fire/EMS and 155.9400 is analog fire/ems and these 2 always transmit simultaneously. I guess thats what is called mixed mode?. I still don't know what 155.6325 is. It may be a backup Police channel, as Dinwiddie Sheriffs Dept. always had what they called Channel 3, which was low band 039.5000 on their old system. Thanks for all the help, everyone.

 

[vern23882]

>>I still don't know what 155.6325 is.

It's an analog general use channel for all agencies,and possibly mutual aid for surrounding counties, since no surrounding counties are P25.