CHP Black2 in Sacramento & Yolo counties

[avtarsingh]

gm and inigo you are both correct

bay area is simulcast all mtn tops light up when the tx key is pressed

la getting new simulcast equip soon to replace

the dispatcher can CHOOSE a diff mtn top if a mobile complains about poor reception
the vote streer isnt 100% but its pretty close

occasionally you will hear a unit say you were 10-1 then dispatcher says "ok how about this mtn top"
they reach up and press the diff mtn top on their console to steer it AWAY from where the system says to go


another cool thing to watch .. is when chp has the tone on "clear the air"

watch the signal.. each tone will have a diff signal strength the tone cycles thru all the mtns (1 at a time on each beep) so that the guy way out in timbuktu can hear the tone also

really apparent in areas like redding where the red is used on a WIDE area

that way the guys in burney can hear bunchgrass beep when a guy in redding or all the way over to hoadley mtn (way west of redding) are on a stop or need help

it keeps them from bothering dispatch in urgent situations

 

[scannerboy02]

I am picking up mobiles on a mobile freq (directly) and not a base freq.

This is happening because your scanner is picking up the mobile transmission and the "central" CHP receiver is not.

If the "central" receiver does not pick up the mobile transmission it will not be repeated.

From info in this thread
Black2 "central" receiver is Pine Hill
Green2 "central" receiver is Pine Hill
Gold2 "central" receiver is Pilot Peak (although from monitoring I seem to think it also is Pine Hill)

 

[gmclam]

This is happening because your scanner is picking up the mobile transmission and the "central" CHP receiver is not.

If the "central" receiver does not pick up the mobile transmission it will not be repeated.

From info in this thread
Black2 "central" receiver is Pine Hill
Green2 "central" receiver is Pine Hill
Gold2 "central" receiver is Pilot Peak (although from monitoring I seem to think it also is Pine Hill)

Yup, this makes total sense. I have great reception from both Pilot Hill and Pine Hill. I didn't realize a specific site had to pick up the signal for it to be repeated, I thought it could be a number of them.

 

[inigo88]

Woah that's news to me too, thanks!

The mobile repeated audio definitely goes through the console, unlike a conventional repeater which stays on the mountaintop. Following this logic, I assumed that the receiver voting audio the dispatcher hears would be what went through the console back to the central Tx site (so everything would be repeated).

Co-locating the central receiver with the central Tx site makes sense for simplicity's sake, although it's too bad it's not picking up all the mobile audio. Thanks for the explanation scannerboy.

 

[ScannerDude244]

another cool thing to watch .. is when chp has the tone on "clear the air"

watch the signal.. each tone will have a diff signal strength the tone cycles thru all the mtns (1 at a time on each beep) so that the guy way out in timbuktu can hear the tone also

really apparent in areas like redding where the red is used on a WIDE area

that way the guys in burney can hear bunchgrass beep when a guy in redding or all the way over to hoadley mtn (way west of redding) are on a stop or need help

it keeps them from bothering dispatch in urgent situations

I notice they do that here in Monterey county it sounds like the old hearing test when you have to raise your hand hehe..BTW thanks for all the info on the new setup guys! I think your going to have to update the wiki page for CHP.

 

[scannerboy02]

From what was explained to me the mobile audio is received by several sites at the same time and the voter selects what mobile audio to put through to the console. The mobile audio is only repeated if it is picked up by the central receiver. It is also my understanding (although I am not totally clear on this) that if the audio is picked up stronger at a site other than the central receiver and is also picked up by the central receiver the stronger audio will go through to the console but the weaker audio will still be repeated by the central receiver but not go through to the console.

Again this is my understanding of how it works from info I have gotten from people using the system and monitoring seems to back it up but avtarsingh may be able to confirm for sure.

If this is not how it works gmclam is correct, some mobile traffic picked up by our scanners on the mobile frequency is not being repeated on the base frequency.

 

[avtarsingh]

scannerboy nailed it.. thats why on old brown on chico sometimes the mobile audio was repeated ..sometimes it wasnt

console repeat

 

[scannerboy02]

Seems like mobile repeat has been turned off, haven't been getting mobiles on the base frequency for the past few days.

 

[scannerboy02]

Doing lots of testing on Gold2 right now.

 

[gmclam]

CHP (non)repeated

I was going to mention this. I have been all over the valley in the past few days (White2, Gold2, Black2, Blue2, Green2) and have caught a LOT of mobile traffic not repeated. I was up on Pine hill a couple of times where I picked up mobiles on Gold2 and they were not on the base freq. One mobile was on 51 north and the other on Hazel. Unless Pine is a non-repeat site, I could not imagine why these signals were not repeated.

But it has not stopped there. I was on Black2 a lot yesterday, and some mobiles were repeated and some not. I know this can be 'normal'. It just shows you, those who are depending on hearing all the traffic by only monitoring the base frequency, are missing out.

 

[avtarsingh]

dispatcher can turn it on and off at will

it annoys some dispatchers so they turn it off

happens on the bay area a lot also
defeats the whole purpose of the repeater

 

[sacscan]

Sounds like they turned the repeaters on last night. Still on tonight.

 

[scannerboy02]

Not sure if CHPERS has made some system changes or if its the weather or what, but yesterday I started picking up auto repeated traffic on all of my portable and base radios from inside my home in Natomas and its still working right now. Up until yesterday I have only been able to get auto repeated traffic on my base radio connected to my CHP antenna.

 

[scannerboy02]

Today I was getting mobile traffic on the black2 base frequency from a unit who sounded as if he was using a digital radio. The dispatcher and other mobile units sounded normal but this one unit definitely had that digital garbled sound in his transmissions.

I had been told they were going to start testing the 700MHz P25 extenders in the area soon but this is the first time I have heard the digital garble sound on a CHP channel.

 

[ScannerDude244]

I was wondering how they would use the P25 extenders... Will the extenders convert p25 to analog ?

 

[scannerboy02]

Will the extenders convert p25 to analog ?

Yes but I do not know exactly how.

I was wondering how they would use the P25 extenders

From what limited info I have read it sounds like the P25 extenders will have the ability to access all of the new radios CHP will be installing in the units. The plan as I read it is to have a VHF low, VHF hi, UHF and 700/800Mhz radio in each patrol unit. I am not sure how the extender will access the radios, if they will assign a different NAC, DTMF, or frequency to each radio but the word is the officer will be able monitor and control any car radio they want from the extender.

 

[scannerboy02]

CHPERS unit doing radio testing right now on Gold2 reporting location and if radar is on or off.

 

[scannerboy02]

Just heard CHPERS2 doing radio checks on the old black mobile 42.7000 frequency.

 

[gmclam]

Just heard CHPERS2 doing radio checks on the old black mobile 42.7000 frequency.

Were they transmitting a CT?

 

[scannerboy02]

Were they transmitting a CT?

Yes the old valley 179.9 tone.

I could not tell for sure if he was transmitting close to my location or if it was coming from a mountain top but he was loud and clear during all 3 radio checks. I did not hear anything on the old base frequency.