Dave,
The simple answer is Yes.
The opto isolators appear to be open collector. If that is so, you can treat
them like switches
and can parallel them as desired. I feed my PTT line with a PTT switch, Opto
from
soundcard interface, Vibroplex bug and straight key for example. No diodes
needed. In fact
adding diodes adds voltage drop on the PTT line which is not a desirable thing.
-Lee-
WA3FIY
On 12 Dec 2012 at 15:35, d.e.warnick@comcast.net wrote:
>
>
> 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
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>
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