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Scott and others, just an FYI. Some people get caught by the active
low signalling on the URI.<br>
<br>
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. <br>
<br>
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).<br>
<br>
The COR and PL inputs are internaaly pulled hi and have dc blocking
diodes to prevent over voltage damage.<br>
<br>
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. <br>
<br>
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.<br>
<br>
So for active low the "Corfrom" should be set for "usbinvert". For
active hi signals the "corfrom" is set for "usb".<br>
<br>
If it looks like the radio cant pull the COR to ground then an NPN
transistor can be employed to pull the line low. <br>
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.<br>
<br>
hope this helps.<br>
<br>
Jon vA3RQ<br>
<br>
<br>
<br>
<br>
<br>
On 5/22/2017 6:30 AM, Scott Westerman wrote:
<blockquote
cite="mid:CAKA-Djw6ukgD2iGLL8LY4ZA=qraTd3axmc5sUL7cxZR8n7KCEw@mail.gmail.com"
type="cite">
<div dir="ltr">I was able to get the 820 up and running with this
configuration.
<div><br>
</div>
<div>
<div>Name is: usb
</div>
<div>Rx Level: 500
</div>
<div>Rx no-delay: 0
</div>
<div>Rx audio-delay: 0
</div>
<div>Tx A Level: 500
</div>
<div>Tx B Level: 500
</div>
<div>preemphasis: no
</div>
<div>deemphasis: yes
</div>
<div>plfilter: no
</div>
<div>rxboost: yes
</div>
<div><br>
</div>
<div>PTT: Active LOW
</div>
<div>PTT status: Un-Keyed
</div>
<div><br>
</div>
<div>CTCSS (input): CM108/CM119 Active HIGH
</div>
<div>COS (input): CM108/CM119 Active LOW
</div>
<div>COS (test): Un-Keyed
</div>
<div>COS (composite): Un-Keyed</div>
<div><br>
</div>
<div>Hope this is helpful for those who may need the info.</div>
<div><br>
</div>
<div>Scott W. - W9WSW </div>
</div>
</div>
<br>
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