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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