Ummm ... sometimes we tend to inflate the magnitude of a problem ... just try it out.  Plug a straight key [or your keyer] into the KEY jack on the K3/0 and see if it works.  I believe the odds are way better than even that it will, especially if the cable plugged into the 1258 I/O jack is part of the "quadrapus" cable set that Elecraft sells for exactly this purpose.

I do not have a K3/0, I operate W7RN remotely with my K3, and the I/O RJ45 on the back of my 1258 is empty, so I key using pin 4. However, I've coached several with K3/0's to get configured properly for W7RN and they plug the key, bug, or keyer into the KEY jack.

Try it out ... we're Amateurs, what could go wrong?

73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 7/22/2019 12:47 PM, John Huffman wrote:
Mitch -

That has worked for other radios and my RemoteRig box, but the K3/0-Mini has a connector that is already plugged into the I/O jack.  I tried taking it out and using the connector I used with other radios, but that didn't work.  I wonder if I disconnect pin 4 from the Elecraft connector and instead connect my keyer output to pin 4 if that will do damage or disrupt the operation of the K3/0-Mini?

73,
John


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