[App_rpt-users] DMK URI COS Level / Kenwood TKR-850

[REDBUTTON_CTRL]

Further to my previous post, the COR and PL inputs have a dc blocking 
diode. This prevents external DC from affecting these inputs. These 
inputs are internally pulled up. So any external DC will not affect the 
URI from detecting a change. Only grounding these pins will cause a 
signal change. They can either be pulled low on signal detect (active 
low) or pulled low with no signal and left to float when there is a 
signal (Active HI).
If the external device sources a voltage and does not pull to far enough 
to ground, then it wont work. But if the input signal does pull to 
ground then it will work. It is not necessary for the external radio to 
source any voltage to interface with the URI COR or PL inputs.

I regularly use NPN transistors on some radios to give me an open 
collector that pulls low(ground) when the COR or PL decode is active.

Jon VA3RQ

On 5/9/2015 3:59 PM, REDBUTTON_CTRL wrote:
> Set the Kenwood COS o/p to active low and connect to the URI. Set the 
> "Corfrom" to "Usbinvert" In the Usbradio or Simpleusb. files.
>
> The URI COR & PL inputs require a signal that goes to ground. It 
> doesnt care about voltage swing.
>
> Jon VA3RQ
>
> On 5/9/2015 2:24 PM, David McGough wrote:
>> Hi John,
>>
>> Yes, the TKR-850 (version 2, at least) will interface perfectly with 
>> a DMK
>> URI, no extra parts required...I've got several 750's and 850's on-line.
>>
>> One caveat to note is that you may wish to add a pull-down resistor 
>> on the
>> COS signal line to keep the URI from thinking the RX is active it the 
>> URI
>> is unplugged from the repeater or the repeater is off.
>>
>> 73, David KB4FXC
>>
>>
>>
>> On Sat, 9 May 2015, John wrote:
>>
>>>   Is the 0-5 Volt COS swing on a Kenwood TKR-850 sufficient to 
>>> switch the
>>> COS on a DMK URI? Can't seem to get my system to repeat. I'm out in the
>>> 'boondocks' with very few parts and a long way from a Radio Shack. Just
>>> hoping I don't need to buffer the COS somehow to get it to switch.
>>> John
>>>
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