Try this page (no pun intended) You need an NPN transistor and a diode: http://m.dummies.com/how-to/content/electronics-components-use-a-transistor-... Sent from my iPhone On Jun 25, 2013, at 10:08 AM, James Hill <g0fhmuk@gmail.com> wrote:

Guys,

I'm trying to get COR sorted via the Parallell port.

I've figured out I need to ground pin 15 in order to turn RX on and off.

The problem is, I have a +5V signal from my radio when there is a carrier present.

Can anybody point me toward an easy circuit to be able to convert the +5V to a negative in order to turn the RX on and off? If I set ppinvert, it turns the RX on when I ground the pin - so that seems to be the way to go.

I've tried googling, but all sorts of stuff comes up!

Thanks,

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