I had made a interface to a cat1000 but from the PPort some years ago. Don't use it anymore. And I suggest using a transistor buffer in any case. I doubt that the URI can sink enough current without it. 2n3904/06 work well. I used opto-coupled transistors to isolate it. Can be overkill but limits RFI and lightning/spike damage. ...mike/kb8jnm

Being pulled low enough is kind of what I was thinking and wondering if others have had that issue. Its really the only thing that makes any sense to me in terms of what I am experiencing.

A little digging shows this solution, which I will try this weekend once I dig out my parts.

http://dmkeng.com/images/HIGH_CURRENT_PTT.pdf

...

I seem to recall some people having issues with the PTT output not being pulled low enough, you might try searching the list archives for a similar situation. I recall several fixes from adding a reed relay, inserting a diode in line, or using a transistor buffer, might have been a jfet.

Steve

---

App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users

To unsubscribe from this list please visit http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button" You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem.