[TenTec] Tech Question

[d.e.warnick at comcast.net]

I am keying my CW from an RS-232 port, and my PTT line when using RTTY FSK from an RS-232 port 

The rig is an Orion II 

My interface from the RS-232 to the Orion II is an Opto-Isolator (I use the W3YY interface as it is a nice board available as a kit) 



Now my question: 

In both cases above, I key the PTT line via the accesory cable supplied with the Orion II 

Can I just parallel theOpto-Isolator outputs, or do I nied diode isolation, that is a diode between the Opto-Iasolator and the PTT port (I'll have to check the keyed voltage polarity to determine which way to turn the diode? Or as a less convenient option, should I switch between the two keying interface chips? If I use diodes, I'll also route my foot switch through the interface box and put a diode in series with that. 


Sorry for my complete ignorance of the Opto-Isolators. Please educate me 



73 & thanks 

Dave 

WA3F 



ps - The FSK signal is via the TxD lead from the RS-232 port also via one of the chips in the kit. It is not an issue as it is not connected to either of the PTT keying lines