same thing happening in norcal - chp brown chico -
some genius never researched that missouri has the same PLs
if they had left the pls at the old tones - wouldnt be a problem
Not necessarily. If your receiver is quiet you'll usually only pick up signals coming in with "your" tone of course. But once one of your stations/cars is transmitting and your receiver is thus "open," anybody else on the frequency who's strong enough (regardless of their PL) can tag along and double with (or clobber) your guy's signal. A couple of Missouri's 42 MHz transmitters are licensed for
10,000 and 15,000 watts, which doesn't help CHP much either.
We used to have that problem in L.A. in the VHF-high days. When skip was in town, a couple San Diego PD (or SO?) frequencies would occasionally piggyback onto our Central or Rampart cars' transmissions and mess with them, sometimes making them unreadable. If our units weren't talking we'd never hear a peep from San Diego, but they
would come in if our guys were transmitting.
Even worse and more constant for us was Pomona PD who used 155.55, the same frequency as LAPD Venice Div mobiles. I don't remember what tone, if any, Pomona used, but L.A. tried various fixes such as changing PL tones a couple times, and trying different receiver sites, but we still had many hours of intermod trying to hear the Venice units. Weekend nights were usually the worst, since Pomona would obviously be busier just like we were. "Repeat" became as common a word as "Roger" for the dispatcher. One of the very first things they did when they got the T-band frequencies was to drop 155.55 from the license in 1978 and give Venice the old Newton Div freq (155.25). Newton then became one of the test divisions for the new "ROVER" system (506.9375 at first, IIRC).
