RE: [Repeater-Builder] Mitrek COS ?

Fri, 19 May 2006 07:27:16 -0700

Shane,
 
In my case, I had to supply a COS indication to be able to move to the next stage...  then the inbound signal is evaluated for the presence of the CTCSS tone....  Once both conditions are met, my controller will key the transmitter.
 
I don't know for sure how the linker-II operates, but...  I have a RC-210 on a Micor and it will not key the transmitter unless it gets a COS signal.  COS is step 1...  adding the requirement of TOS (CTCSS) is step 2.  Most controllers set for tone squelch operation (at least all I have ever had dealings with) will require both conditions to be met before it will key the transmitter...
 
I also run a tone on my 6m repeater.  I was having trouble with my micor in that the COS signal would never go completely to zero volts...  this would have kept the transmitter keyed all the time if I didn't require the tone.  Like you, I do not plan to disable the tone..  ever. 
 
As the signaling logic for both the TOS and COS are positive in my application, I just tied both COS and TOS detect (from the controller) to the TOS indicator on the radio. Now when the receiver sees a tone on the inbound signal, both get the proper logic signal needed to key the repeater.
 
The repeater works fine, but I am unable to drop the tone requirement on the input.  I haven't had a chance to deal with the "floating COS voltage" as of yet...  but I plan to correct the condition when I get a chance. 
 
I would reccomend connecting the controller according to the manufacturers instructions....  but this approach should work for you......

 73
Mike Perryman
www.k5jmp.us

-----Original Message-----
From: [email protected] [mailto:[EMAIL PROTECTED]On Behalf Of Shane Autrey
Sent: Thursday, May 18, 2006 11:06 PM
To: [email protected]
Subject: [Repeater-Builder] Mitrek COS ?

I have recently purchased an ICS LinkerIIa controller. Super nice guy on
the phone with prompt shipping.. I have a question for the group..
Where I live we have a lot of problems when we do not use PL/CTCSS on
repeaters for various reasons. So my question is this... I am using a
converted Mitrek plus 50W mobile (of course PA is turned down)
with the HLN4181 tone board.

I understand all of the connections etc (thanks repeater-builder.com!)
to the outside of the radio. I do not intend to run the repeater at
any time in COS mode. It will be in PL mode at all times. If I do this
will I still have to hook up the COS to the repeater controller or
not? I assume that I can just use the CTCSS input on pin 9 of P1
(Port1) on the controller for full control and not hook up pin 8 (COS
input). Is this correct or am I totally looking over something? Again
let me state again the repeater will be in PL decode mode at all
times.. I do not
 intend to remove the PL at any time..

Thanks ahead of time

Shane KI4M

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