Low band radios (Was: Re: [Motorola] Talk About

[Joseph L. Rossmiller]

About half of the Illinois State Police districts use simplex, mobile and bases
on same frequency.  The other half have the mobiles on one frequency, and the
base on another.  No base repeaters are used.  Most districts have multiple
transmit/receive sites.  The receive audio is feed to a voter at the main
district office either via microwave or telephone lines.  The transmitters are
controlled the same way using tones.  The voter at the district office picks the
signal with the best signal (least amount of noise) and forwards only the audio
from that receiver to the dispatch console.  The telecommunication (they don't
like being called dispatchers) selects which transmitter site, and which
transmit frequency, by pushing different frequency select switches and different
push to talk buttons for each site.  Most bases at the main district
headquarters are 300 watts.  Base transmitters at remote sites are 100 watts.
All the mobiles are 100 watts.

Gary Chatters wrote:

> >
> >it was on the 42 MHz  ISP low band system....  I was using a BC-780 XLT
> >with a Motorola speaker (MICOR vintage, i believe, for this particular
> >unit, although i am considering going to some of the older ones i have
> >here...MOTRAC vintage...they look neater...but are more difficult to mount,
> >the way i have my truck set up)....I know it was direct...  I have been
> >playing with programming setups for the 780....  tyring to find what works
> >best for I-55 through IL....  (I can hear a couple of counties for about
> >3/4 of the trip....think they might be using a bit more power than they
> >need to)
> >
>
> ISP = ?  I'll guess you mean Illinois State Police.
>
> Scanners aren't too bad today for audio quality.  My first scanner
> was a Regency.  Audio was so bad that after a couple of hours of
> monitoring I couldn't stand to listen to it and got rid of it.
> A real mobile (i.e., Motorola) would probably be better.
>
> I use external speakers on my mobile radios even if they have an
> internal and on my scanner at home.  You might want to compare the
> sound of the MOTRAC speaker to the MICOR style speaker before installing it.
> I think the MICOR is better.
>
> High power is common on low band.  A state police system is probably
> trying to cover a wide area with a limited number of base station sites.
> Are you listening to the mobiles or the base station?  Most likely
> it is a simplex system with mobiles and base on the same frequency.
>
> gc
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