Hi all, I'm in PA and hearing CHP skip nearly daily after noon to sundown. I've got all of the CHP database in my 325. Every once in a while I hear what sounds like data or tones of some sort. It does have a PL on it. Most recent capture was 42.92 pl 103.5 @ 1604 Eastern time. Just wondering if anyone can shed some light on the tones I'm hearing. Thanks!
Before the CHPERS was implemented about 20 years ago, the 42.92 Meg freq was the "Maroon" station to car & car to car frequency. As part of the CHPERS program, all the channel pairs were supposed to be configured as 42/39 megs or 42/45 meg pairs statewide with the 42 meg freq being the car to station channels. I don't think the 42.92 meg freq would be a station to car freq. after the CHPERS program was implemented, at least it wasn't the original channel plan
If you were hearing traffic that said, " Golden Gate, 19-681", that would be a Contra Costa Area beat unit that works Interstate 680 calling dispatch on the 42.92 meg freq, 19-681 should have been receiving dispatch on a 39 or 45 meg freq. Now, if you were hearing traffic that said, "19-681, Golden Gate", that would be dispatch calling the unit on 42.92 megs.
Before CHPERS, Contra Costa Area was on the "Maroon" channel that used 42.74 Megs for the car to station freq and received dispatch on 42.92 Megs. Again, I don't know if the CHPERS channel plan changed when the CHPERS was implemented.
It wasn't unusual for the mobile units to skip to the East Coast years ago along with the Dispatch channels.
If the tones are a short blurp of tones, you may be hearing the voting comparator or system control tones that sometimes don't get filtered out.
Any use of ANI or GPS data probably wouldn't have been transmitted on the Low-Band channels. More than likely that data would have been transmitted over the LTE Cellular network like the MDCs data are transmitted.
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