CHP scanning

[joldson]

hey everyone, i just had a quick question about scanning chp. i see there is freq. plus input. what is the difference, and which (or both) should i program into my scanner. also, i see there is a tone value. do i need to program that too (into my 246t)?

Frequency Input License Type Tone CH Description Mode
42.08000 42.76000 KIZ237 BM 107.2 PL AMBER-2 Susanville/Quincy/Alturas Office FM


Thanks,
Jeff

 

[Mick]

I'm not positive, since I have not visited that far north in the state, but I would use both the Base and the Mobile frq. in my scanner. If the Base frq. is actually a repeater, then you won't need to monitor the Mobile frq. You will need the 107.2 ctcss only if you're hearing a distant user on 42.08, or if your radio gets rf from your computer or other source if interference.

 

[joldson]

thanks for the quick reply! so which is mobile, and which is base? and i am putting in the whole state, i just pasted that first.

 

[Mick]

42.08 Base, 42.76 Mobile for Amber2, Susanville, Quincy, and Alturas. Happy monitoring!

thanks for the quick reply! so which is mobile, and which is base? and i am putting in the whole state, i just pasted that first.

 

[SCPD]

My listening experience over much of the state of California finds that the CHP has its mobile traffic broadcast over the remote bases on the base frequency mostly in urban areas. In rural areas this is not done very often . I think this is due to rural areas having more communications sites per dispatch center than the urban areas. The area I live in, the eastern Sierra region of California, is dispatched by Bishop and covers Mono, Inyo, and eastern Kern Counties with 8 communications sites. This area is about 225 miles north to south and mountainous, which does not allow for units to hear traffic from one remote base over a wide area. Two of the sites were being simulcast with mobile traffic broadcasting to those sites also being broadcast so that units in the central portion of this region (on Silver Peak east of Bishop) could hear the southern portion base (either Oak or Government Peaks) and mobile traffic and vice a versa, but that left out the other 6 sites. Extending the simulcasting to additional remote bases at the other communications sites would have caused interference as more than two remote bases could be received by field units at a time. The mobile traffic rebroadcast was dropped after only a few weeks trial period. The CHP also uses a voting system for establishing the best site to respond back to a mobile unit and to eliminate annoying weaker signal audio from being heard by the dispatcher.

Does the CHP actually have repeaters where mobile units contact each other using the office area frequency in the car to station mode rather than car to car on the base frequency? I haven't listened to the CHP in urban areas recently enough to know this. I also wonder if the mobile traffic from other remote bases, some distance from the one transmitting it over the base frequency, is also routed to this one communications site remote base? Example in the Riverside county area the mobile traffic is broadcast over the base frequency on Snow Peak or Keller near Banning, but is it not only broadcasting traffic voted as the best audio for that site, but traffic voted the best audio for Chuckwalla, Parker Dam, and others?

I'm also under the impression that the CHP does not actually have repeaters as such, but patches the audio from the mobile frequency to the base frequency on their remote bases.

Shouldn't this thread be in the California forum?