First off, does your controller have separate COR and PL inputs?
Just so you're clear on how Micor PL and noise squelch work, here's a
little refresher.
As configured stock, on a Micor, when PL is decoded, it will override
the noise squelch. In other words, if it sees PL, the squelch will
open, no matter how noisy the signal is or how tight you have the
squelch set to. Likewise, it will open the squelch whether you have the
PL disable turned on or off. On a stock Micor, if PL's there, the
squelch opens no matter what.
With PL disable turned on, carrier squelch OR PL decode will open the
receive audio paths. With PL disable turned off, PL decode must be
present to open the receive audio paths, and they won't close until PL
drops out regardless of the squelch setting. Generally this is not what
you want in a typical amateur installation when you want take advantage
of the legendary (?) Micor squelch action AND be able to use the PL
decoder. Generally speaking, when using a Micor in amateur service, if
you want PL decode, what you're really looking for is COR AND PL, with
COR operating independently of PL within the Micor station. In other
words, the COR and PL should be AND'ed together externally (either via
circuitry, or by using a controller that has an "AND squelch" access
mode with separate PL and COR inputs. There is a Micor "AND squelch"
modification, but with modern controllers, it's usually best to let the
controller do the work which gives you the flexibility of going into
COR-only or COR-and-PL modes by DTMF control.
To start off, you can isolate the PL decode from the squelch circuit by
cutting a jumper on the audio/squelch card. I don't have a manual in
front of me, but if you look at where the PL indicate line comes from
the PL decoder into the last squelch IC, you want to open the circuit
there.
You also want to leave PL disabled, i.e. don't ground the PL disable
line. This allows the noise squelch to operate.
After doing the above, you will have an independent PL indicate line
(+9.6 when decoding, high-Z when not decoding). You may need to lift
the pull-up in your controller, and/or add a pull-down, to deal with
those logic levels.
The COR on the Micor can be taken off the audio/squelch board. It, too,
should be active-high. Depending on what other cards are in the shelf,
it usually idles around 3 or 4 volts when the squelch is open, but you
don't want to try to source any current from it. When the squelch is
closed, it sinks current. For most controllers, just putting a diode in
series (cathode towards Micor) should work if there is a pullup on the
controller's COR line built in.
There can be other COR-like lines in a Micor station, but it depends on
what cards you have installed. Where are you taking COR from presently?
--- Jeff
------------------------------------------
Jeff DePolo WN3A
Broadcast and Communications Consultant
> -----Original Message-----
> From: Jim Cicirello [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, February 02, 2005 11:25 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] Select CTCSS and CSQ on Micor Receivers
>
>
>
>
> Good Morning to the group:
> Can someone who may have been there and done that tell me the best
> way to operate both CTCSS and CSQ Decode from a Micor Base converted
> into a repeater? Let me clarify what I would like to do…..I would
> like to be able to touch tone in CTCSS Decode when needed. The
> majority of the time I want to run CSQ. In studying the manual it
> appears that CTCSS is active high and CSQ is active low. I thought of
> converting them to the same active COR state and them just switching
> the COR input to the controller, but is CSQ present when the CTCSS
> switch is in the decode position? I have to believe this has been
> done by some of you, so I would appreciate your input. Thanks in
> advance guys!
> 73 JIM KA2AJH Wellsville, N.Y.
>
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> Yahoo! Groups Links
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