If it is positive true COS anything above +2 should assert COS - in that case you would be using usb NOT usbinvert in your config. COS is blocked by a diode so anything up to 20+ volts on a high is OK. It does have to go to a good low - 0V if possible.

Obviously if it is negative true COS it would be just the opposite and using usbinvert.

Go into the client - asterisk -rvvv and watch the log. You should see a hungup status on drop of signal. You can exercise this manually for testing if desired.

73 Doug
WA3DSP
http://www.crompton.com/hamradio

From: wb5nfc@gmail.com
Date: Sat, 9 May 2015 12:49:35 -0500
To: App_rpt-users@ohnosec.org
Subject: [App_rpt-users] DMK URI COS Level / Kenwood TKR-850

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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