[App_rpt-users] COR

KP4TR (Ramon Gonzalez) kp4tr.ramon at gmail.com
Tue Jun 25 11:22:24 EDT 2013


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-as-a-switc.html


Sent from my iPhone

On Jun 25, 2013, at 10:08 AM, James Hill <g0fhmuk at 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
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