I believe that they did this because of the large number of offsets that would
be required in a large system. The Quitron/Glenayre system I worked on had
over 100 transmitters and some of the overlap areas had 3-4 transmitters
illuminating the same area.
If I were to build a system that only had, maybe 4 or 5 transmitters, I would
use 20HZ. I don't see how 20HZ would get thru the audio circuit of a
transceiver. Too close, such as 2 to 6 cycles, would up the chance of two
transmitters drifting exactly on the same frequency. (You don't want this).
20HZ would be better, in my opinion, on a small system, more room for frequency
drift without zero beat occurring. An interesting side effect of 20HZ would be
that, if the tone became audible, it's an automatic indicator of maintenance
being needed because a transmitter drifted off the 20HZ offset.
Hearing the simulcast offset tone would be no different than hearing a little
PL tone leak through. It would also indicate that you are in a simulcast area.
73, Joe, k1ike
---- Paul Finch <[EMAIL PROTECTED]> wrote:
> FYI,
> Quintron's offsets ran 2 to 6 cycles per transmitter at the most. 20 cycles
> if getting audible. At 2 to 6 cycles the system sounds pretty good.
>
> Paul
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