<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 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>