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  #41 (permalink)  
Old 10-30-2012, 9:10 AM
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Just heard the same two users on TG 2854. Apparently the Bull Run site is down (loss of power) and one of them will be heading up there.

And FYI for everyone, Loudoun will be upgrading to actual Phase II in January.
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  #42 (permalink)  
Old 10-30-2012, 11:47 AM
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Quote:
Originally Posted by rescue674aa View Post
If you look it says T for TDMA capability but that doesn't mean it is TDMA
Stupid and misleading is what having the database like that is. There are no TDMA or FDMA talkgroups, because really they are both. What mode they are in depends on what type of radios are being used on a talkgroup.



1241- TG 2854 has got to be radio techs. They're still talking about fixing the Bull Run site, seems like it's been fixed.
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Last edited by freqhopping; 10-30-2012 at 12:42 PM..
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  #43 (permalink)  
Old 10-30-2012, 1:07 PM
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The system is TDMA-capable. All of the talkgroups - to our knowledge at least - have the ability to run either with TDMA or FDMA. This means that if all of the radios affiliated with a talkgroup are capable of TDMA, the talkgroup will be assigned to a TDMA channel when it is used. If a non-TDMA radio affiliates with the talkgroup, then that talkgroup will be assigned to an FDMA channel until all of the radios on that talkgroup are once again TDMA-capable.

Some talkgroups are almost always FDMA - Fire and Rescue Dispatch 6A is one of those. Others - like Leesburg Police - are almost always TDMA (though I will admit that last night while Sandy was running amok, I did notice that Leesburg PD was FDMA; maybe they pulled some older portable radios out last night?).
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  #44 (permalink)  
Old 10-30-2012, 1:26 PM
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Quote:
Originally Posted by freqhopping View Post
And FYI for everyone, Loudoun will be upgrading to actual Phase II in January.
Off-topic (since this topic is about talkgroups), but I'll just say that I'll believe it when I see (hear) it. I've heard at least 4 dates throughout this year, and it hasn't happened yet.

Maybe there's a scanner enthusiast running their system, making sure we can still hear everything (and now that there's a Phase 2 upgrade for the 800, we can)... but I'll be that skeptical person until it actually happens.
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  #45 (permalink)  
Old 10-30-2012, 8:34 PM
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Quote:
Originally Posted by freqhopping View Post
Stupid and misleading is what having the database like that is. There are no TDMA or FDMA talkgroups, because really they are both. What mode they are in depends on what type of radios are being used on a talkgroup.
Not true; there can be TDMA only TGs. (I am not saying the DB is not being used correctly.)

Quote:
Originally Posted by mikev View Post
The system is TDMA-capable. All of the talkgroups - to our knowledge at least - have the ability to run either with TDMA or FDMA. This means that if all of the radios affiliated with a talkgroup are capable of TDMA, the talkgroup will be assigned to a TDMA channel when it is used. If a non-TDMA radio affiliates with the talkgroup, then that talkgroup will be assigned to an FDMA channel until all of the radios on that talkgroup are once again TDMA-capable.
All talkgroups do not have this capability. Talkgroups can be restricted to TDMA only, whereas an FDMA radio would not be able to use that TG.

Quote:
Originally Posted by mikev View Post
Some talkgroups are almost always FDMA - Fire and Rescue Dispatch 6A is one of those.
It may appear to be FDMA all the time becasue neighboring jurisdictions are always monitoring it with an FDMA radio.

Quote:
Originally Posted by mikev View Post
Others - like Leesburg Police - are almost always TDMA (though I will admit that last night while Sandy was running amok, I did notice that Leesburg PD was FDMA; maybe they pulled some older portable radios out last night?).
I doubt during an emergency (like Hurricane Sandy), which generates additional traffic on a radio system, that anyone would load up a TDMA system with FDMA radios. Doing so would essentially diminish the purpose of TDMA, which is capacity.
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Last edited by loco-lee; 10-30-2012 at 8:36 PM..
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  #46 (permalink)  
Old 11-26-2012, 5:27 PM
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Today Pro96Com logged a bunch of new TGs. 2931 through 2939. All but 2937 and 2939 had encryption. 1145001 as last on 2931 and 1115008 as last on 2939 seem to be the only radios involved. I've logged other radios in that range before but usually on FD channels.

On 11/19 I logged TG 4101 with RID 3270010.
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  #47 (permalink)  
Old 11-27-2012, 2:46 AM
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Quote:
Originally Posted by freqhopping View Post
Today Pro96Com logged a bunch of new TGs. 2931 through 2939. All but 2937 and 2939 had encryption. 1145001 as last on 2931 and 1115008 as last on 2939 seem to be the only radios involved. I've logged other radios in that range before but usually on FD channels.

On 11/19 I logged TG 4101 with RID 3270010.
I've seen the 4xxx TGs show up in the past. I think they were radio techs. If I remember correctly it was the day before they rebanded.
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  #48 (permalink)  
Old 12-07-2012, 10:51 PM
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Dug through my Pro96Com talkgroups file this evening... here's a few that are unidentified that have shown some traffic recently, along with the date of last transmission on the TG. Keep in mind that the first seen dates are for my logs, and hits may not be representative of how much they've actually been used this year (there were times early in the year that I didn't keep a continuous watch on the system).

None of these have had any encrypted traffic observed on them...
2881 - 12/7/2012 (first seen 1/24/12, 21 hits)
2884 - 12/4/2012 (first seen 1/24/12, 57 hits)
2903 - 12/3/2012 (first seen 1/24.12, 1097 hits)
2904 - 12/6/2012 (first seen 2/4/12, 113 hits)
2905 - 12/4/2012 (first seen 1/24/12, 111 hits)
2916 - 12/6/2012 (first seen 2/1/12, 6 hits)

Also, as reported, a block of TGs from 2931-2939 appeared on 11/26/12... all but 2937 and 2939 show presence of encrypted traffic. Most have only one hit, one has two, one has four.

4xxx TG's run from 4090 to 4101... Saw all of them appear for the first time for me on 1/25/12. Very low usage TGs.

Also, two TGs in the 5000 range appeared on 10/29/12... 5376 and 5377... 1 and 3 hits respectively, not encrypted.
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Last edited by mikev; 12-07-2012 at 10:54 PM..
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  #49 (permalink)  
Old 12-30-2012, 4:58 PM
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Anybody know who is using the RIDs in the 250#### range? I would imagine Prince William FD since I know the RID ranges for other surrounding counties. I've just never been listening when these RIDs were active.

Also 310#### and 313####. These have occurred on FD and LCSO channels.
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