Scott and others, just an FYI. Some people get caught by the active low signalling on the URI. What I mean by that is the URI input lines like to see a signal that goes to ground. It doesn't care for input voltage applied but does care if the inputs are grounded. This is true for active hi signals (signals that are normally ground then go hi when a signal is present) or active low (signal is hi then goes to ground when signal is present). The COR and PL inputs are internaaly pulled hi and have dc blocking diodes to prevent over voltage damage. So in some cases the voltage swing from the connected radio doesn't pull the lines to ground but does source a dc voltage change. So depending on how the logic is set the URI may not see the change or may think the radio is receiving all the time and time out the node. So for active low the "Corfrom" should be set for "usbinvert". For active hi signals the "corfrom" is set for "usb". If it looks like the radio cant pull the COR to ground then an NPN transistor can be employed to pull the line low. It the transistor is used then the logic set for cor from should be changed to the opposite from above as the transistor inverts the logic. hope this helps. Jon vA3RQ On 5/22/2017 6:30 AM, Scott Westerman wrote:

I was able to get the 820 up and running with this configuration.

Name is: usb Rx Level: 500 Rx no-delay: 0 Rx audio-delay: 0 Tx A Level: 500 Tx B Level: 500 preemphasis: no deemphasis: yes plfilter: no rxboost: yes

PTT: Active LOW PTT status: Un-Keyed

CTCSS (input): CM108/CM119 Active HIGH COS (input): CM108/CM119 Active LOW COS (test): Un-Keyed COS (composite): Un-Keyed

Hope this is helpful for those who may need the info.

Scott W. - W9WSW

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