CHP 700MHz Extenders

[K6GBW]

Has anyone programmed the 769.000 extender frequencies? If so, what kind of range to they have? Back in the day I used to listen to 154.905 and in the L.A. area there are so many cars within a few miles you could hear a LOT of CHP traffic. It also kind of told you when a CHP was nearby. I programmed in the 700MHz extender frequencies with the proper NAC codes into my APX as receive only channels. So far I have yet to hear a peep on them. Just want to see if anyone has any information.

 

[d119]

New CHP Extender Channel Assignments

CHP has begun rolling out vehicles with a new radio/lighting/computer system called EV-20. These vehicles will gradually replace the older vehicles, which are equipped with a system called CPVE. The 700 MHz extenders associated with the EV-20 system are using the same VRS channels 1-16 as the...

forums.radioreference.com

 

[K6GBW]

Thanks for the link. I guess the range of the 700 MHz extenders is just too short to really be all that useful.

 

[f40ph]

Program all of the extender channels with NAC F7E so you receive any P25 transmission. This will also help bridge the timeframe between old and new extenders. I listen while driving and hear them come and go as you would expect. No need to program specific NAC codes as you would want to hear any P25 transmission on those freqs.

 

[K6GBW]

Program all of the extender channels with NAC F7E so you receive any P25 transmission. This will also help bridge the timeframe between old and new extenders. I listen while driving and hear them come and go as you would expect. No need to program specific NAC codes as you would want to hear any P25 transmission on those freqs.

That is an excellent idea. I forgot I can do that. Thanks!

 

[nd5y]

I guess the range of the 700 MHz extenders is just too short to really be all that useful.

People report about getting about a mile range using the 1 watt 900 MHz digital spread spectrum hand held radios. A 700 MHz extedender probably runs 2 W into a vehicle roof mount antenna. If you have a decent receiver and antenna you should be able to receive them at least that far.

 

[gmclam]

I have them all programmed and set the NAC to Search so I'll get whatever comes my way. I live near a major intersection and always picking up something that's coming in on another radio (I run multiple receivers simultaneously). When out on the highway, it is often very effective that I am near an incident/vehicle stop or even just a parked cruiser. Even if the signal is encrypted, it works for me.

 

[AM909]

People report about getting about a mile range using the 1 watt 900 MHz digital spread spectrum hand held radios. A 700 MHz extedender probably runs 2 W into a vehicle roof mount antenna. If you have a decent receiver and antenna you should be able to receive them at least that far.

IIRC, they're designed for very short range, like a few car lengths. Weren't the old VHF extenders in the 100 mW range? I'd expect even less at 700 MHz.

 

[K6GBW]

People report about getting about a mile range using the 1 watt 900 MHz digital spread spectrum hand held radios. A 700 MHz extedender probably runs 2 W into a vehicle roof mount antenna. If you have a decent receiver and antenna you should be able to receive them at least that far.

Yeah, I have a set of DTR radios, and they have amazingly good range. That was what was on my mind when I programmed the 700MHz frequencies in. But I literally drove across the county, passing CHP cars enroute, and never heard a peep...nothing..nada. So just trying to figure it out. I just reprogrammed using NAC F7E so we'll see if that makes a difference.

 

[K6GBW]

UPDATE: I'm a moron, I put in the older CPVE frequencies my mistake. I reprogrammed with the newer EV-20 frequencies and voila' there they were. Problem solved.

Thanks for everyone's efforts to help with this!

 

[APX6k]

Anecdotally speaking, most of the weigh/CMV inspection stations I have passed also have an active extender. They seem to cover a larger footprint than the patrol cars I have received while travelling. I'm guessing if they're permanent features of the weigh station, they're using a building mounted antenna with better height. As was suggested above, I have always used a NAC of F7E with good success.

 

[nokones]

Yeah, I have a set of DTR radios, and they have amazingly good range. That was what was on my mind when I programmed the 700MHz frequencies in. But I literally drove across the county, passing CHP cars enroute, and never heard a peep...nothing..nada. So just trying to figure it out. I just reprogrammed using NAC F7E so we'll see if that makes a difference.

CHP Officers are only suppose to turn on their in- trunk vehicular repeaters when stationary and keep them disabled while driving. At one time, they were considering preventing the repeater from being enabled when the vehicle was out of the park position.

 

[f40ph]

UPDATE: I'm a moron, I put in the older CPVE frequencies my mistake. I reprogrammed with the newer EV-20 frequencies and voila' there they were. Problem solved.

Unless I'm reading them wrong, EV-20 are the same freqs as CPVE. Each office/area's freq changed but if you had all of the CPVE in scan with F7E, you should hear old and new extenders.

 

[K6GBW]

Unless I'm reading them wrong, EV-20 are the same freqs as CPVE. Each office/area's freq changed but if you had all of the CPVE in scan with F7E, you should hear old and new extenders.

Not in LA County. The only one that was the same was LA Central, the rest were different for some reason. Once I programmed it with the right frequencies I started hearing them right away. I have the East LA CHP station close to me so I hear quite a bit.