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The URI wants to see a signal that goes hi to low or open collector
to ground. It also has a diode on the input to block incoming
voltage. So if your COR line sources a voltage then removes it but
doesn't go all the way to ground when it goes low, then the URI will
not see a transition. <br>
<br>
So perhaps you can put a resistor to the base of a NPN transistor
and connect the collector to the URI I/P. Change the carrier from to
"USB" in usbradio.conf and you should be good to go.<br>
<br>
<div class="moz-cite-prefix">On 9/26/2014 11:50 AM, Mike M wrote:<br>
</div>
<blockquote
cite="mid:CADpNt1NHVkC-MtLc5igYGCMExHnJmJeX77e2Gao6ja=doiniFA@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_quote">Resending since my initial post has
been pending moderation for 2 days now and got no reply from
the list owner email.<br>
<br>
I have modified an HT to bring out the receive LED signal and
use it<br>
as the COR input to a DMK URI. It is a digital signal as
viewed on a<br>
scope (i.e. very short slope in the transitions) This seems
like it<br>
would work well and it does on strong signals. But on marginal
signals<br>
where the LED may blink on and off quickly (like during picket<br>
fencing), it seems to confuse the URI (or the software) were
it will<br>
start off good, but then a quick dropout of the COR signal
will cause<br>
the software to no longer detect carrier, even though the
signal on<br>
the COR input has been restored. Even if the input is solid
high (or<br>
low in my case, I'm using usbinvert) it will not detect a
carrier<br>
until there is another dropout of adequate time to "reset" it.<br>
<br>
I've tried putting a simple RC on the input but it didn't
really help<br>
much. Seems the URI (or software) needs a significant minimum
time<br>
between transitions to properly detect them, long enough that
it would<br>
delay the carrier detection too much without a circuit more
complex<br>
than an RC (i.e. something that would allow instant keyup, but
delay<br>
the key down.)<br>
<br>
Linked is a scope image. </div>
<div class="gmail_quote"><br>
</div>
<div class="gmail_quote"><a moz-do-not-send="true"
href="https://lh5.googleusercontent.com/-CsJ9autUTAE/VCWK-uNJJpI/AAAAAAAAPSM/VsVvbPVvuEA/s800/20140923_184107.jpg">https://lh5.googleusercontent.com/-CsJ9autUTAE/VCWK-uNJJpI/AAAAAAAAPSM/VsVvbPVvuEA/s800/20140923_184107.jpg</a></div>
<div class="gmail_quote"><br>
</div>
<div class="gmail_quote">Carrier was detected until this signal<br>
dropout event. Ch A is my RC filtered signal sent to the URI,
Ch B is<br>
the signal out of the radio. Carrier was not detected after
the 5th<br>
dropout even though the signal remained low.<br>
<br>
Anyone ever experience this and/or have ideas on how to fix
it?<br>
<br>
Thanks.<br>
<br>
Mike<br>
KF7MBK<br>
</div>
<br>
</div>
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