New San Jose Fire Freq Found

[LowBat]

Now that we know they are narrowband frequencies, shouldn't the Mode column read FMN instead of FM?

 

[trooperdude]

Now that we know they are narrowband frequencies, shouldn't the Mode column read FMN instead of FM?

Yes they should.

And as soon as I have 20 minutes of contiguous free time, they will.

 

[Retired911Guy]

Also question about CMD 14 & 15

Same Freq, Diff PL

Mistake on Freq, or Freq to be used if different areas of the city at the same time with diff PLs so as not interfere with each incident ?

And just noticed as reprogramming software, Tac 35 same Freq, Diff PL.

 

[trooperdude]

Nope, same frequency, different PL.

Repeaters are scattered around the city, including mobile on truck companies, so same frequency but different "channel" (PL) on their radios.

San Jose re-uses a couple of freqs with different PL's.

Also question about CMD 14 & 15

Same Freq, Diff PL

Mistake on Freq, or Freq to be used if different areas of the city at the same time with diff PLs so as not interfere with each incident ?

And just noticed as reprogramming software, Tac 35 same Freq, Diff PL.

 

[Retired911Guy]

BTW, you mentioned repeaters on Truck Companies....

This is what I have:

453.075000 SJ High Rise TU1 -9 CTCSS 173.8 (TU1 & 2 = Truck UHF 1 & 2)
453.125000 SJ High Rise TU2 -9 CTCSS 173.8

(These are listed in the Kelty books, but my contact with SJFD told me the below)

The antennas are mounted on the top of the ladders and when they go to high rise buildings they extend the ladders to the floor that the call is on (including alarm sounding) so that the truck repeats out what the handhelds are saying.

Never was told exactly how it worked, IE: FF's on 5th floor have UHF handhelds? or top of ladders receive VHF then repeat out on UHF then translator on the Truck or another unit repeats back out on VHF Freq assigned to incident???

Don't really know...

 

[kmh603]

Truck Repeaters are for VHF Channels. The listed UHF Hi-Rise Channels you show are on a separate Portable Radio that can be used on Hi-Rise. Each company only has 1 UHF portable. It is used as a separate talk around on Hi-Rise incidents. Not for Command or Dispatch. As far as same frequency, There are different PL tones for the same frequency. The listed frequency as being the same in NOT a frequency error, it just has a different pl tone. It is so the same channel can be used in different parts of the city, since San Jose is so big and spread out, it can be used for special ops or training.

 

[lbfd09]

Also question about CMD 14 ... .... .... .

I remember 14 was used county wide to refer to White 1, although it was Control 14 back then...

Did I just date myself?

 

[Retired911Guy]

KMH603,

Thanks, that answered my post very well. I HAD 2 sources at SJFD or very close to, one retired, the other moved on to become a BC at another Dept. So where I used to get good info from one or the other now I have none. So thanks again to ALL who have posted info on this thread!!!

BTW I used to be KMA224, KML703, KBZ298, KML958 & KAR969 (not in that order) and back in those dayz we were required to give our mobile call sign KF6355 but we never did.

I remember 14 was used county wide to refer to White 1, although it was Control 14 back then...

Did I just date myself?

lbfd09, Marin County Comm Center also called white 1 "control 14" before they went with MERA, MCSO was control 1, etc,etc. And strangely enough the Marin CO Comm Center Manager that set that all up back in the Late 60s came from Santa Clara CO Comm Center.

now I think I dated myself also....
Dave

 

[Ben96cal]

New San Jose Fire Freq Found…

155.925

Currently re-transmitting audio from SJFD 1 (155.025 Dispatch).

Yesterday heard signal on 155.925 about ½ strength of Dispatch (155.025)

Today hear signal better than Dispatch (155.025).

Radio Shop may be testing different sites to make sure all TX sites are working well. (Has most of the same sites as Dispatch 155.025)

History of Freq: Prior to July 1st 2010 (2 weeks ago), 155.925 was used as SJ City Misc Gov Paging system.

City Gov workers who used these pagers were told about a month ago that the paging system was going to be discontinued on July 1st 2010 and if their office needed to get a hold of them, they would have to provide a CEL Number.

SJFD is now using it (or at least testing it)….What it will eventually become I don’t know, maybe the missing Command 2?

I have a couple of feelers out with a couple of scanner people I know from down there so HOPEFULLY I may get some info.

But everybody who has ANY contacts with SJFD please inquire.

Has anyone noticed SJ dispatch 155.0250 being very scratchy and pretty unreadable after the restructure of freq's?

 

[Retired911Guy]

Yes, I have.

I used to pickup SJFD Dispatch fairly well before, now, as you say it's weak and broken if at all at my location in the back end of a valley in Marin Co.

Dave

 

[Ben96cal]

It turns back to normal as soon as the sun goes down

 

[kmh603]

Sounds like maybe you are getting interference? SJFD transmits on 7 antennas with 100 watts on a 7 Dbi antenna. Command 11 transmits on Loma Prieta Mtn at 3400ft. elevation. SJFD and Command 12 and 13 use Simulcast dispatch around the City. There is no "turning down" of any power! -KMH603

 

[Ben96cal]

doesn't NFM reduce the signal by 30%?

 

[trooperdude]

I've noticed a severe drop off on dispatch in readability lately, as well as some sounds that indicate to me their simulcast timing on that frequency isn't quite dialed in yet.

And yes, going narrowband decreases signal penetration and typically requires more sites for adequate coverage.

 

[MonitorMike]

This is a little late, but I notice that SJFD Dispatch is not rebroadcasting on 155.925.

Also, how do they decide which TAC channel to use at an incident? Is it an automatic assignment from the CAD system? There was a TIER on Sas Felipe Road yesterday on TAC 31.

 

[Stealthguy05]

Incidents north of 280 are SJS CMD 12, South are SJS CMD 13. 11 seems to be a floater. CNT CMD 20 is used for freeway auto aids most of the time

 

[zerg901]

What is the scoop on the UHF channels? Are they for UHF to UHF portable comms? Or are they for "UHF to VHF" relay? Or both?

 

[kmh603]

SJ Fire Command 11 uses Tac 31, Command 12 uses Tac 32, Command 13 uses Tac 33, etc. The UHF channels are used by the Captains to talk on a high rise incident. It is a simplex channel with no dispatchers on it. And you are correct with Narrow band the signals are reduced by up to 30%.

 

[MonitorMike]

Thanks for the Command to Tac linkage, kmh603.

You know it's a hard core listener who uses the callsign of the SJFD as his name here.

 

[zerg901]

The info in the Radio Ref database for San Jose FD does not match the info on the County Fire Mutual Aid website (July 2011 freqs). Primarily - should 150.805 and 150.775 be listed as "BM" or "M"? Command 13, 14, and 15 are different also.