[App_rpt-users] Cos setting

[Kevin Custer]

As it has become more difficult to recover quality COS and CTCSS from 
(some) radios, here are two solutions - depending on what's required:

http://www.repeater-builder.com/w3kkc/products/squelch/ms25.html
http://www.repeater-builder.com/w3kkc/products/squelch/sc50.html

Both will provide the pull to ground required by a URI or modified FOB.  
Because the Schottky protection diodes have some voltage drop, and a 
"valid" signal on the CM108/119 needs to be around 1.0V or less, these 
boards will provide the necessary logic levels for predicable operation.

Kevin - W3KKC


On 3/7/2015 1:58 PM, REDBUTTON_CTRL wrote:
> The URI requires a signal that pulls to ground in either active hi or 
> low modes. Its not enough to see a voltage go hi or low. The signal 
> from the radio MUST pull to ground or the URI will not see a change. 
> If the COS/COR from your radio only sources voltage but doesn't pull 
> to ground, then you need to use that line to drive an NPN transistor. 
> (2N 3904 or 2N2222 will work).
> You can put a 4.7 K resistor on the base and connect your radio's COS 
> to that. Then connect the Emitter pin to ground and the Collector pin 
> can be connected to your cor line on the URI. Then all you have to do 
> is set the "Carrierfrom" to either USB or USBinvert in the USB radio 
> config. This way the cor line from the transistor collector will pull 
> to ground when the squelch opens in your radio.
>
> Also note that using the transistor will invert your COS/COR signal. 
> So if you have a voltage that goes high when the squelch opens then 
> the O/P of your transistor will go low. Then set Carrierfrom to 
> USBINVERT. (Active low).
>
> Also to test this make sure you have your Ctcssfrom from set  to no. 
> Once you have this working then you can add ctcss gating the same way. 
> The CTCSS input on the URI also looks for a signal that pulls to 
> ground. It doesnt care about applying a voltage to the pin.
>
> Both the COR and CTCSS input lines on the URI have internal diodes to 
> block incoming voltage. Again it only cares if the signal goes to 
> ground or not.
>
> Hope this helps.
>
> Jon VA3RQ
>
> On 3/7/2015 11:11 AM, Skyler F wrote:
>> How can I trigger the Allstar receiver when it gets a voltage from 
>> COS or switch 3 on the fob?
>>
>>  Does it automatically trigger when a voltage is there?
>>
>> I added 5v to the COR URIx and did not get any trigger and I also 
>> tried closing SW3 on the home brew fob. Am I doing something wrong?
>>
>> I will be getting a COS out on my radio and want to use The CTCSS on 
>> the radio instead of in AllStar.
>>
>>
>> Thanks
>> Skyler
>>

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