Re: [Repeater-Builder] Re: COS output for Kenwood

[WD7F - John in Tucson]

Hook that signal to the base of the transistor through a 10K or so resistor.
That should provide enough isolation to prevent loading of the signal.  I
hope it's going positive when the squelch is open so your COS will be low
when active.

de WD7F
John in Tucson

- Original Message - 
From: "jkstrsn" <[EMAIL PROTECTED]>
To: 
Sent: Saturday, January 20, 2007 7:40 AM
Subject: [Repeater-Builder] Re: COS output for Kenwood


> Jim,  thanks for the suggestion.  Unfortunately it doesn't have a
> receive LED, only a bar-graph which is also used for transmitting.
>
> The optoisolator idea has merit though.  I have located a point in the
> radio which changes voltage, but only by about 1/2 V and it is very
> sensitive to loading.  So far I've tried one transistor but it loads it
> too much I guess.
>
> I'm going to try again later this morning, I either need to find a
> point that switches more voltage or maybe try a fet or something so as
> not to load the other one?
>
> Again,  thanks,  any other ideas are welcome.
>
> Jeff
>
>
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>
>
>
> Yahoo! Groups Links
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[Repeater-Builder] Re: COS output for Kenwood

[jkstrsn]

Jim,  thanks for the suggestion.  Unfortunately it doesn't have a 
receive LED, only a bar-graph which is also used for transmitting.

The optoisolator idea has merit though.  I have located a point in the 
radio which changes voltage, but only by about 1/2 V and it is very 
sensitive to loading.  So far I've tried one transistor but it loads it 
too much I guess.

I'm going to try again later this morning, I either need to find a 
point that switches more voltage or maybe try a fet or something so as 
not to load the other one?  

Again,  thanks,  any other ideas are welcome.

Jeff

[Repeater-Builder] Re: COS output for Kenwood

[fineshot1]

Jeff - If you have a TSU6/KQT8 CTCSS decoder installed you can get an
active high from the foil side pin 4 marked as "SDO" in the service
manual(assuming you have one).dan n2aym

--- In Repeater-Builder@yahoogroups.com, "jkstrsn" <[EMAIL PROTECTED]> wrote:
>
> I have a TM-431A which I want to use as a half-duplex link.  I can 
> easily get audio in and output,  but I'm stumped on how to get a 
> voltage change when the squelch opens for COS (Carrier-operated-squelch)
> 
> Ideally I'd like a voltage that swings only when the CTCSS is detected 
> as well as squelch open,  but I'd settle for one that is just the 
> squelch.
> 
> My controller is an ICS linker.  
> 
> Does anyone know the proper point to connect to,  or does anyone have a 
> service manual for this unit?
> 
> Thanks,
> 
> Jeff WB0LRX
>