The transmitters should be set as close to
Freq-operation as possible.
Use the same service monitor to set up all the
stations unless you have some special type of
alignment equipment.
One trick of the trade:
I used to disable the local station except for the
low level stage while monitoring other mountain
top locations on the out door antenna. Much of
the time one could hear the other site(s), which
is very handy.
Anything but an exact alignment is distortion of
some type. I used to have a Motorola audio tape
I/we used to demo what different simulcast problems
sound like. It was quite interesting... except
the [EMAIL PROTECTED]& (last person) I lent it to never returned
it.
cheers,
skipp
> Joe <[EMAIL PROTECTED]> wrote:
> 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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