Georgia State Patrol Freq.

[Cow]

In my area, GSP cars transmit on 154.800 and the post (base) tansmitts on 154.680. How are the radios in the troopers cars programmed? I have a Kenwood TK-730 and when I have my radio on GSP car, I can't hear the post talking. Why is that? How can the troopers hear the post when they are on car/car?

 

[KFR_697]

In my area, GSP cars transmit on 154.800 and the post (base) tansmitts on 154.680. How are the radios in the troopers cars programmed? I have a Kenwood TK-730 and when I have my radio on GSP car, I can't hear the post talking. Why is that? How can the troopers hear the post when they are on car/car?

because GSP has they're radios set up in a duplex format, almost as if it were on a repeater but it's not. The post for a specific troop, transmits on 154.680 and then the unit or units that they are talking to answer back on 154.800. But there have been instances before, where i have heard cars and the bases transmitting on 154.680 as well. I don't know how they do this either, but my guess is that the troopers probably keep the car radio on 154.800/Car-Car but also have it on scan mode so they can monitor the local police and sheriffs dept. frequencies in they're troops district; and then they have 154.680/Base-car as they're priority channel probably, so that if the post tries calling them it will immediately jump back to the 154.680 channel so they can hear what the traffic from dispatch is. They're portables are probably set up in a similar fashion, if i'm even close to being correct about what was mentioned earlier. But bottom line is, you need to have both 154.680 and 154.800 in your radio, this set-up is universal throughout the state and all/most GSP posts use it like this.

 

[kg4ojj]

GSP cars are programmed like this:

Receive 154.680, Transmit 154.800, no PL or DPL tone (e.g., CSQ)

Their car to car, which is rather neat, is 154.680 simplex.

Here's an example to help explain:
2 troopers are within sight of each other and communicate with 154.680 simplex.
The Post calls one of them a traffic accident assignment.
The troopers are listening to 154.680 and quickly flip to their "main channel" to respond to the Post dispatcher.

For the scanner listener, you will have to have separate channels for GSP Base (154.680) and GSP Cars (154.800).

Don't forget the statewide frequencies 154.935 (LEA Base) and 154.905 (LEA Cars). Works the same as GSP's "main channel." Again, no PL or DPL.


GSP channel 1 = duplex pair, as described by KFR-697
GSP channel 2 = GSP car-to-car
GSP channel 3 = Car to base, using the statewide duplex pair
GSP channel 4 = Car to car, statewide (154.905 simplex)

 

[N8IAA]

Don't forget 765.4375/156.7PL. That is the mobile extender in the cars.
Larry

 

[b7spectra]

Also, NLEFC 155.4750!

 

[cr2]

Quick question. There are 2 mobile extender freqs.

Which one is currently in use? I've read conflicting info on it in the past. There have been comments that said that 765. is when they are on 800mhz base and the 458 when they are on their VHF main..

But recently people only give the 765. is the 458 no longer in use?

 

[N8IAA]

Quick question. There are 2 mobile extender freqs.

Which one is currently in use? I've read conflicting info on it in the past. There have been comments that said that 765. is when they are on 800mhz base and the 458 when they are on their VHF main..

But recently people only give the 765. is the 458 no longer in use?

765.4375 is used with the VHF radios. I know. I've monitored that frequency local, and up in the N GA mountains, where they only use VHF.
Larry

 

[cr2]

Thanks. So that is the broadcast to their handhelds for sure

So does that leave the other one as obsolete (458)? I am picking up a "signal" on it but never any actual voice. Basically scanner will auto stop on it every few seconds/minutes like it catches something but nothing ever comes through.

Trying to figure that out

 

[b7spectra]

The old 458 frequency, if you are lucky, has maybe 2 watts on it as they are normally within spitting distance of their car. With the troopers who use 800, they have no need for the extender frequency as they will just come up on the TRS.