Portland 700 P25

[OregonScanner]

Just heard TG 1809 it was BOEC dispatching engine 11 to respond on Ops 1. Multiply 1809 by 16 and you get TG 28944 which is Tapout on 800.

 

[ChrisP]

Nice catch! Someone over on the 700 MHz side must have been affiliated to that talk group. Not all of the 800 MHz analog talk groups will be steered over to the P25 side, but we know that one will.

- Chris

 

[DickH]

Just heard TG 1809 it was BOEC dispatching engine 11 to respond on Ops 1. Multiply 1809 by 16 and you get TG 28944 which is Tapout on 800.

Good find! I wonder if that applies to all Talk Groups?

 

[OregonScanner]

Good find! I wonder if that applies to all Talk Groups?

Do you mean the multiply by 16 thing?

 

[DickH]

Do you mean the multiply by 16 thing?

Yes. Assuming it does, there will be 2048 talk groups corresponding to the Analog Talk groups, using 32 spacing. I wonder how many can be on a digital system.?

 

[OregonScanner]

Yes. Assuming it does, there will be 2048 talk groups corresponding to the Analog Talk groups, using 32 spacing. I wonder how many can be on a digital system.?

If a talkgroup is present on both a P25 system and an 800MHz system, the one on 800 MHz will be 16 times larger in number. So when a new TG comes up on the P25 side, I multiply it by 16 to see if its also on 800. You could also go backwards and divide the 800 TGs by 16 and pre-program the P25 system in your scanner. Some people do this in other parts of the country when their area is switching from 800 to P25.

I don't know the exact number of TGs but there are some pretty big P25 systems out there. Look at Colorado DTRS and Illinois StarCom for example.

 

[DickH]

I don't know the exact number of TGs but there are some pretty big P25 systems out there. Look at Colorado DTRS and Illinois StarCom for example.

I see what you mean. The Colorado system is huge! At a quick scroll through the TGs, I saw as low as 2 and as high as 11900. Makes analog systems look pretty small.

 

[scannerizer]

If a talkgroup is present on both a P25 system and an 800MHz system, the one on 800 MHz will be 16 times larger in number. So when a new TG comes up on the P25 side, I multiply it by 16 to see if its also on 800. You could also go backwards and divide the 800 TGs by 16 and pre-program the P25 system in your scanner. Some people do this in other parts of the country when their area is switching from 800 to P25.

I don't know the exact number of TGs but there are some pretty big P25 systems out there. Look at Colorado DTRS and Illinois StarCom for example.

That sounds about right. I have seen that with EDACS system, it's easy to convert the TGIDS to a Motorola TGID just by multiplying by 16. For example, on BC's WARS, talkgroup 1825 X 16 = 29200 (a Motorola talkgroup).

 

[OregonScanner]

I caught techs earlier on TG 809 which is 16 times smaller than 12944 which is PPB East Pct Tac 4.

 

[astrousr]

So is it just me or this new 700 system using encryption all the time?

 

[OregonScanner]

The only users on the system right now are specialty law units like drugs/vice etc. which are all encrypted. Patrol units are still on the 800 MHz analog system. I have no idea when patrol units and fire will switch over but talk here in the forums has been that dispatch talkgroups for police will be in the clear. I wouldn't expect fire to use encryption.

 

[astrousr]

The only users on the system right now are specialty law units like drugs/vice etc. which are all encrypted. Patrol units are still on the 800 MHz analog system. I have no idea when patrol units and fire will switch over but talk here in the forums has been that dispatch talkgroups for police will be in the clear. I wouldn't expect fire to use encryption.

Whoever is using it is has picked up the pace lately. Seems like pretty often I see multiple talk groups active during the afternoon and evenings.

 

[OregonScanner]

Got a recording of C1 on TG 97 calling it Ops 9. Multiply 97 by 16 and bingo you get 1552 which is Multnomah Co Fire ops 9.

 

[OregonScanner]

Clear traffic on 717 which is PPB SERT/SWAT Tac 1 (11472 on the 800 system). Seems promising that one of the swat channels is in the clear.

 

[sparklehorse]

Clear traffic on 717 which is PPB SERT/SWAT Tac 1 (11472 on the 800 system). Seems promising that one of the swat channels is in the clear.

Was this for the incident on SE Lambert last night? Were the transmissions P25 Phase I or Phase II?

Thanks

 

[OregonScanner]

Was this for the incident on SE Lambert last night? Were the transmissions P25 Phase I or Phase II?

I believe so. They were P25 Phase I.

 

[boycesm]

This entry is already in the 800MHZ DB

11472 2cd A PPB SERT T1 Specialized Emergency Response Team (SERT) Tac 1 Law Tac

I got this by multiplying 717 x 16 = 11472

Do we know if anyone has gone through and multiplied the whole 800Mhz DB?

Good Catch by the way.

 

[DickH]

Do we know if anyone has gone through and multiplied the whole 800Mhz DB? ...

Don't you mean DIVIDE the 800MHz database?

 

[boycesm]

Yes! Can't figure out how to edit my post, but I meant "Divide" Thank you for catching my mistake.

Is there a way to

 

[boycesm]

Yes! Can't figure out how to edit my post, but I meant "Divide" Thank you for catching my mistake.

Is there a way to