Sacramento P25 system

[officer_415]

You only need the control channels programmed. The system tells the scanner which frequency to go to for each transmission.

 

[N6ML]

Hey Friends I have only Primary Control channels & Alternate Control channels programmed in my Uniden BCD 996p2 For Sacramento Countywide & Davis! The Issue I see is That Un programmed channels will show up when a Unit Keys Up! Such as 853.9000 That Channel is not programmed in the Scanner I think this issue effects the Transmission or am I wrong? Any Advice would be Awesome

Assuming that you actually want to hear voice traffic, this is normal and expected. The control channel streams data that your scanner can decode and track. When a traffic channel is granted to a talkgroup (e.g. for voice traffic), a control message is sent with information about the grant. Any radio interested in that talkgroup (such as your scanner) can then change to that traffic channel, receive the traffic, then (when the traffic ends) change back to the control channel. Your scanner only needs to be programmed with the control channel(s), because traffic channel frequencies are transmitted in those control messages. This is a bit over-simplified, but hopefully sufficient to address your question.

 

[mcjones2013]

If I'm understanding your problem correctly, I believe the scanner is working as it's supposed to.

The rest of the unprogrammed channels are the voice channels that the units actually talk on. Your scanner only needs the control channel frequencies programmed and will know which voice channel frequency to switch to when a unit keys up, whether or not you have them programmed in.

For example, on Site 12 (Countywide Simulcast), there are 30 total frequencies for the site. 4 of the frequencies are control channels. The rest of the 26 frequencies are what the units use as voice channels. Not to complicate things, but the actively unused control channel frequencies (3/4) can also be used as voice channels IF all other voice channels are busy, which is rare.

 

[CityNewsSupport]

If I'm understanding your problem correctly, I believe the scanner is working as it's supposed to.

The rest of the unprogrammed channels are the voice channels that the units actually talk on. Your scanner only needs the control channel frequencies programmed and will know which voice channel frequency to switch to when a unit keys up, whether or not you have them programmed in.

For example, on Site 12 (Countywide Simulcast), there are 30 total frequencies for the site. 4 of the frequencies are control channels. The rest of the 26 frequencies are what the units use as voice channels. Not to complicate things, but the actively unused control channel frequencies (3/4) can also be used as voice channels IF all other voice channels are busy, which is rare.

Thanks Guys As always you are the Best

 

[scannerboy02]

Question Regarding SRRCS Control Channels

Hey Friends I have only Primary Control channels & Alternate Control channels programmed in my Uniden BCD 996p2 For Sacramento Countywide & Davis! The Issue I see is That Un programmed channels will show up when a Unit Keys Up! Such as 853.9000 That Channel is not programmed in the Scanner I think this issue effects the Transmission or am I wrong? Any Advice would be Awesome

Thanks As Always

I'm not sure I understand what you are saying here. You only need to primary and alternate control channels programmed in the scanner. The scanner will switch to the traffic/voice channel on its own to receive the transmission.

If you have the control channels for both sites programmed into the same system you may want to separate them as that can cause the scanner to lock on one site or the other and it will not receive traffic from both sites. Each site should only have 4 frequencies programmed in it.

 

[CityNewsSupport]

I'm not sure I understand what you are saying here. You only need to primary and alternate control channels programmed in the scanner. The scanner will switch to the traffic/voice channel on its own to receive the transmission.

If you have the control channels for both sites programmed into the same system you may want to separate them as that can cause the scanner to lock on one site or the other and it will not receive traffic from both sites. Each site should only have 4 frequencies programmed in it.

I'm not sure I understand what you are saying here. You only need to primary and alternate control channels programmed in the scanner. The scanner will switch to the traffic/voice channel on its own to receive the transmission.

If you have the control channels for both sites programmed into the same system you may want to separate them as that can cause the scanner to lock on one site or the other and it will not receive traffic from both sites. Each site should only have 4 frequencies programmed in it.

Thank You Sir
Great Idea On The Separation! & I know understand from other replys why I am seeing Un Programmed Channels during Transmissions

 

[chmsant]

Has anyone else noticed that Fire Dispatch A (TGID 3325) seems to hang a lot in the last week or so? The automated dispatch system keys up, announces the fire call, and then holds the frequency and talk group open with dead air for 30-60sec before finally dropping. Seen on my SDS100 and confirmed via watching activity in UniTrunker.

It seems to be affecting FD radios as well because human dispatchers have had to come up on the dispatch channel and ask that a particular apparatus come up on A2 or A3 for traffic far more often than they usually do, presumedly because the FD radios in the field are also holding on DSP A and the dead air.

Thoughts?

 

[hexagon_keyhole]

Has anyone else noticed that Fire Dispatch A (TGID 3325) seems to hang a lot in the last week or so? The automated dispatch system keys up, announces the fire call, and then holds the frequency and talk group open with dead air for 30-60sec before finally dropping. Seen on my SDS100 and confirmed via watching activity in UniTrunker.

It seems to be affecting FD radios as well because human dispatchers have had to come up on the dispatch channel and ask that a particular apparatus come up on A2 or A3 for traffic far more often than they usually do, presumedly because the FD radios in the field are also holding on DSP A and the dead air.

Thoughts?

Not just you. It's also being discussed here: Sac Metro Fire A1 TG on SRRCS

 

[mcjones2013]

Hello all!

For anyone who uses software to monitor SRRCS, has anyone else noticed that Site 12 seems to only be using 24 of the 30 available frequencies? Even during busy traffic periods, it only seems to be using 24/30 frequencies?

These frequencies seem to have been taken out of Site 12 channel pool. I'm wondering if there's some plans to implement a new site somewhere with these? Or maybe they're just being worked on?

851.32500

851.43750

851.67500

851.75000

851.82500

853.26250

Also, DSDPlus logged Site 14 going in and out of isolated status multiple times earlier this week.

 

[mcjones2013]

Also, the old "C SP 4" (3739) and "C SP 5" (3741) appear to now be used by Sac RT. I believe it may be for their Elk Grove transit operations, since they took over Elk Grove's service. Elk Grove Transit (e-tran) was using at least two talkgroups on the Fisher Wireless TeamTalk DMR system prior to Sac RT taking over the service.

 

[CityNewsSupport]

Hello all!

For anyone who uses software to monitor SRRCS, has anyone else noticed that Site 12 seems to only be using 24 of the 30 available frequencies? Even during busy traffic periods, it only seems to be using 24/30 frequencies?

These frequencies seem to have been taken out of Site 12 channel pool. I'm wondering if there's some plans to implement a new site somewhere with these? Or maybe they're just being worked on?

851.32500

851.43750

851.67500

851.75000

851.82500

853.26250

Also, DSDPlus logged Site 14 going in and out of isolated status multiple times earlier this week.

Last week the DOJ sent memo out reminding Public Safety Radio Operators of Privacy Laws regarding Transmission of personal info! I think we will see many Agencies Encrypting at least a tac channel in order to comply. I have also noted Hospital's starting to build out new Radio Systems so I think Ambulance to Hospital Communications will also see Encryption! Wonder if this is tha cause of the Local changes?

 

[mcjones2013]

Last week the DOJ sent memo out reminding Public Safety Radio Operators of Privacy Laws regarding Transmission of personal info! I think we will see many Agencies Encrypting at least a tac channel in order to comply. I have also noted Hospital's starting to build out new Radio Systems so I think Ambulance to Hospital Communications will also see Encryption! Wonder if this is tha cause of the Local changes?

This has nothing to do with the channel pool situation.

Sheriff and Elk Grove PD already have an encrypted records channel (Roseville as well). Other agencies have either filed time extensions or are complying with passing non-PII when running record checks.

The folks at Northern California APCO which many of our local dispatchers/department brass are apart of seem to understand the interoperability benefits, transparency benefits, and future political/policy benefits of leaving the main channels in the clear, so I don't think we'll see many local agencies encrypt their dispatch channels.

Also those new hospital radio systems in the DB, I found and submitted those. They're likely for hospital security, engineering, admin, etc. Not likely for ambulance-to-hospital communications.

 

[KG7PBS]

Also, the old "C SP 4" (3739) and "C SP 5" (3741) appear to now be used by Sac RT. I believe it may be for their Elk Grove transit operations, since they took over Elk Grove's service. Elk Grove Transit (e-tran) was using at least two talkgroups on the Fisher Wireless TeamTalk DMR system prior to Sac RT taking over the service.

Yes 3739 is E-Tran Main Dispatch. And 3741 is probably there supervisor channel. I have been listening to it for the last 2 weeks now

 

[officer_415]

I can add them to the DB. Did these replace 3317?

 

[mcjones2013]

I can add them to the DB. Did these replace 3317?

I think that exists in the fleetmap but was never used. E-Tran was originally on a 900 MHz SMR, then TeamTalk. Never any use of 3317 (and really, no use of any of the Elk Grove local government channels with the exception of occasional use of EGCE 1).

 

[officer_415]

Gotcha. DB updated

 

[gmclam]

For anyone who uses software to monitor SRRCS, has anyone else noticed that Site 12 seems to only be using 24 of the 30 available frequencies? Even during busy traffic periods, it only seems to be using 24/30 frequencies?

Without knowing all the little details involved, the first thing that struck my mind was Phase I vs Phase II (or similar) as earlier systems could only handle 24 frequencies and only the newer systems can handle 30. It's like the system may have 30 frequencies, but its limit is somehow set to 24.

 

[mcjones2013]

Hello all!

For anyone who uses software to monitor SRRCS, has anyone else noticed that Site 12 seems to only be using 24 of the 30 available frequencies? Even during busy traffic periods, it only seems to be using 24/30 frequencies?

These frequencies seem to have been taken out of Site 12 channel pool. I'm wondering if there's some plans to implement a new site somewhere with these? Or maybe they're just being worked on?

851.32500

851.43750

851.67500

851.75000

851.82500

853.26250

Also, DSDPlus logged Site 14 going in and out of isolated status multiple times earlier this week.

One month later, and this still appears to be the case, only 24/30 frequencies used in the channel pool. Anyone know what's up?

Six frequencies=six repeaters. That's a whole rack in the vault. I'm wondering if they needed room for something else in their tower sites.

 

[scannerboy02]

One month later, and this still appears to be the case, only 24/30 frequencies used in the channel pool. Anyone know what's up?

Six frequencies=six repeaters. That's a whole rack in the vault. I'm wondering if they needed room for something else in their tower sites.

Perhaps they need space for microwave upgrades?

 

[mcjones2013]

One month later, and this still appears to be the case, only 24/30 frequencies used in the channel pool. Anyone know what's up?

Six frequencies=six repeaters. That's a whole rack in the vault. I'm wondering if they needed room for something else in their tower sites.

As of Friday, all 30 channels are back in the usable pool.