Ian,
You should be able to use the KEYOUT-LP signal line. It is an open
drain circuit in the K3, so depending on your transverter design, you
may or may not have to add a pullup resistor. The pullup can go to the
+12 volt line or anything lower in your transverter. I would suggest
that a pullup resistor value of 2.2k to 10k ohms should work. Use a
higher value with higher voltages. The current when the KEYOUT-LP line
is low should be limited to 10 ma. or less.
73,
Don W3FPR
Ian Maude wrote:
> Hi all,
> I have just finished building and aligning a 4m transverter from
> Spectrum Communications which I intend to connect ot the K3 (and
> indeed have had working) as well as my XV144. The 4m transverter
> needs 0 volts to key the PTT. Can I use pin 10 off the accessory jack?
> Are there any other things I need to know about using an Elecraft
> transverter and a non-Elecraft one in a chain? I am using the
> transverter interface at 1mW.
>
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