Loudoun County's new radio system

[cowboywildbill]

Did Loudon change thier system?

A couple of day's ago I was listening to Loudon Sherrif & Leesburg. Now I don't get anything. Did they add any new frequencies or did I screw something up on my scanner? If they did, can I program my RS digital to work?

 

[tglendye]

New system. Just go back a few posts and it'll explain.

Todd

 

[mike_s104]

A couple of day's ago I was listening to Loudon Sherrif & Leesburg. Now I don't get anything. Did they add any new frequencies or did I screw something up on my scanner? If they did, can I program my RS digital to work?

Yes, they did.
No, you didn't.
No, you can't.

 

[atlong]

I just got my Pro-106 installed in my car a few months ago. Yes this sucks. I still can't figure out why we're getting intermittent traffic on 2801-Sterling and nothing for West. Either way, I take Rt267 into work and Rt7 home to WV and there's PD everywhere, but I have no idea what's going down. Totally sucks.

 

[cowboywildbill]

Thanks, Well I guess I've got a new paper wieght with an LCD screen then.
Wonder how long till somebody makes a scanner that will do it? And I wonder if other juridictions will go this route? Did they do it to stop the scanners from being able to listen or just because it is a better system or did they get Fed stimuas money to do it? Got to wonder.

 

[mike_s104]

Thanks, Well I guess I've got a new paper wieght with an LCD screen then.
Wonder how long till somebody makes a scanner that will do it? And I wonder if other juridictions will go this route? Did they do it to stop the scanners from being able to listen or just because it is a better system or did they get Fed stimuas money to do it? Got to wonder.

You can listen to the weather on it.

I think Loudoun didn't do it to make it so you can't listen to them, but rahter just went with a new system. Not sure if/when a scanner will be out to scan this type of system, but I'm sure there'll be more than one person in this area to get one.

 

[cowboywildbill]

I wasn't sure if I read the previous forums correctly, but did the new system also include freqs that we can't get like 700mgz? Or just that our current scanner technology can't track it. I don't even hear any voice on the freqs when I hit them manually not even the Dog Catchers, except for I did get Sterling PD the other day????

 

[mike_s104]

I wasn't sure if I read the previous forums correctly, but did the new system also include freqs that we can't get like 700mgz? Or just that our current scanner technology can't track it. I don't even hear any voice on the freqs when I hit them manually not even the Dog Catchers, except for I did get Sterling PD the other day????

In this same thread, read the past 5 pages and you'll have all the answers.

 

[freqhopping]

Noooo.... The fire department changeover is beginning. There will be dispatchers for both systems until 0730 tomorrow when everyone is supposed to be using the new radios.

UT is now showing LCNs 02-2564 and 02-2565
As I figured, 2872 IS Fire-Rescue Dispatch 6A. Radio tech just came up on it and identified the channel.
1931- LCNs 02-2526 and 02-2565 just showed up.

 

[mike_s104]

Noooo.... The fire department changeover is beginning. There will be dispatchers for both systems until 0730 tomorrow when everyone is supposed to be using the new radios.

UT is now showing LCNs 02-2564 and 02-2565

Hey, you knew it was coming. Ohh well, I guess you can always get the Loudoun Alerts and know about 3 days after something happened what was going on. I didn't even listen today...figured it was pointless. The only systems I can receive at my desk are the 2 Loudoun ones and Montgomery Co. MD. I'd listen to Fairfax if I could; always something going on there.

At least this way you can save up for a new scanner.

 

[byrddog27]

New 700mhz Loudoun County Va

Loudoun County will swtich to the new radio system 12-15-09 at 605am

 

[byrddog27]

will we be able to pick it up on the scanner or we cant pick them up can u let me know please

 

[j2brown]

I did hear BC603 call Loudoun on (new) 6A shortly after the changeover, so there might be some occasional things to hear, at least in the short term. Does anybody know if Fairfax radios can handle the TDMA/Phase2/whatever it really is, or will the system have to remain in some mixed mode for a bit?

jeff
sdg

 

[mike_s104]

The Fire/EMS shift has begun

2872 - Fire/EMS Dispatch
2873 - 6B

 

[rfburns]

New CC 868.9125

At 0816 the TDMA control channel shifted back to 868.9125.

 

[mike_s104]

At 0816 the TDMA control channel shifted back to 868.9125.

Thanks. I knew it was going to be quiet but NOT that quiet. At least not right now.

I also noticed that the control channel on the old system was gone.

 

[fireradio]

I did hear BC603 call Loudoun on (new) 6A shortly after the changeover, so there might be some occasional things to hear, at least in the short term. Does anybody know if Fairfax radios can handle the TDMA/Phase2/whatever it really is, or will the system have to remain in some mixed mode for a bit?

jeff
sdg

Loudoun is operating a Motorola proprietary implementation of TDMA that is similar to P25 Phase II. The real P25 Phase II has not been released yet. Loudoun is the only local government in the area currently operating a system that is capibile of this modulation. Price George's County, Maryland will be launching a similar system in the near future. Stafford will also be getting a new system soon, but don't know if they'll be using TDMA or not.

As others have said, a talkgroup will work in TDMA mode as long as no FDMA (or "regular") radios are affiliated. As soon as an FDMA radio affiliates, the talkgroup reverts to FDMA. This is why you can hear traffic on some talkgroups some of the time, but not all of the time.

Fairfax County does not have TDMA capable radios.

Thanks, Well I guess I've got a new paper wieght with an LCD screen then.
Wonder how long till somebody makes a scanner that will do it? And I wonder if other juridictions will go this route? Did they do it to stop the scanners from being able to listen or just because it is a better system or did they get Fed stimuas money to do it? Got to wonder.

They didn't do it to lock-out the scanners. They did it because TDMA gives you twice the number of voice paths. For example, with a TDMA trunked system operating on 8 frequencies, you could have 15 simultaneous conversations at any given time. Without TDMA, you'd be limited to 7. Its a matter of efficiency. Same reason public safety migrated from conventional systems to trunked systems.

Fairfax shouldn't need rebanding.

Fairfax County is going to be rebanding.

 

[cowboywildbill]

So when all new radios are on the LC system is there any hope for our scanners?
Or do we have to wait for a new type scanner? I do get an occasional talkgroup different ID for the sherrifs but it sounds a little distorted at times.

 

[mike_s104]

So when all new radios are on the LC system is there any hope for our scanners?
Or do we have to wait for a new type scanner? I do get an occasional talkgroup different ID for the sherrifs but it sounds a little distorted at times.

As stated numerous time before, you will need to wait until another scanner comes out, if one ever does, in order to receive the new system again.

 

[N_Jay]

. . . They didn't do it to lock-out the scanners. They did it because TDMA gives you twice the number of voice paths. For example, with a TDMA trunked system operating on 8 frequencies, you could have 15 simultaneous conversations at any given time. Without TDMA, you'd be limited to 7. Its a matter of efficiency. Same reason public safety migrated from conventional systems to trunked systems.

It is 14 conversations, since the control channel is not slotted.
One control and seven 2-slot traffic channels.