Henry S-30 amp question

[K6CPO]

I have a Henry S-30 30W 2 meter amplifier I want to use with my Yaesu FT-270R at home. The Henry requires 13.8V DC and my power supply will be delivered this afternoon.

On one side of the amplifier there is a ¼" phone jack marked "Control." The jack is a stereo jack but there are connections to the shell and the first contact only.

Does anyone know if the amp will operate without anything in the Control jack? If anyone has a copy of the manual for the S-30 and would be willing to send me a copy of it I would be very grateful.

Thanks.

John

[WB2WIK]

The control jack on the S-30 should be grounded (tip, referenced to sleeve or chassis ground) to make it transmit.

Now, some S-30s included RF keying, so a carrier would key them. But I have one that doesn't. I'm not sure what the differentiation was. You could probably just open the amp and look inside to see if it has an RF detector and keying circuit for that.

[K6CPO]

All well and good. If I had any idea what I was looking for...

Electronics is not my strong point.

[K6CPO]

This just gets curiouser and curiouser... The "control" jack is not a 1/4" phone jack. It looks like one, but the hole is actually .200" in diameter. It's .05" too small... To the best of my knowledge, there is nothing between 1/4" and 1/8" phone plugs. I suspect it was some kind of proprietary control system...

I guess I need to try to find a manual.

[WB2WIK]

This just gets curiouser and curiouser... The "control" jack is not a 1/4" phone jack. It looks like one, but the hole is actually .200" in diameter. It's .05" too small... To the best of my knowledge, there is nothing between 1/4" and 1/8" phone plugs. I suspect it was some kind of proprietary control system...

I guess I need to try to find a manual.

There are standard connectors in between. A very popular one for years was the PL-068 (plug) and PJ-068 (jack) which are .206" or something like that. Collins, Drake, Gonset and other ham manufacturers used a lot of those.