> Mike Morris WA6ILQ <[EMAIL PROTECTED]> wrote:
> Unless you are desperate never put more than
> one PL decoder between the user
> and the system transmitter.
Some times you can't help it when the options
are limited.
> Up to this point in the hardware the entire
> system was carrier squelch.
We don't have that luxury in metro locations
like LA and SF. I'm sure the same applies to many
of the East Coast and Mid America Metro Areas.
Carrier Squelch links get played with...
> The main user PL decoder (100hz) was on the
> voter output and fed the PL decode line of the
> repeater controller.
We experienced problems with the voter selecting
stronger undesired csq signals, which wander around
the bands like magic. Some of these magic signals
are sent by undesired types with a lot of free time
on their hands.
> This way if you came up with 100hz any RX would work.
> Later the individual link Maxtrac RXs were programmed
> for different PLs and diode OR'ed together with the main
> user PL decoder. The unique PL tones were intended for
> the repeater committee members to RX test site coverage
> with but ended up with the users using them as well. If
> you came up with, for example, 107.2Hz only link #1 RX
> would open, or 123.0HZ brought up RX #3, but the OR'ed
> PL decode lines caused the repeater controller to see a
> PL decode signal and the system came up. So for the
> cost of programming the Maxtracs for active-low-PL
> decode and a few diodes the system had remote system
> diagnosis... it didn't take knowing the 420mhz link
> frequencies and a scanner to determine that, for example,
> the south receiver was numb.... the end-user could use his
> HT with the proper unique PL tone and see how quieting
> they were.
> Mike WA6ILQ
You can do the same thing or similar test with less
hardware and logic lines from the repeater controller
back to the voter force select or lockout function
with simple dtmf macro commands.
Call me lazy...
skipp
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