[GreenKeys] A request- ST-5A 2206 demodulator unit schematic, literature, anything?

[Mark Hall]

Hello everyone.

This is a demodulator I've been looking for information on, but not an
obscure or home built one. It is either HAL/Mainline and very well-built,
and from checking it in an open area with a fire extinguisher, no
ceremonial smoke ascends. No burnt offering to the goddess Electra today!

With the "hood up", everything looks clean. When "Auto" is selected a meaty
"KERCHUNK" ensues from the beefy GE relay- I did this with my hand on its
case and it was SOLID. It felt like it barked out "ACHTUNG!" Besides the
two stacked ST-5 cards, there is a smaller board right behind the meter on
the bottom of the case that looks like it was a later add-on. The 2206
chip, 4N28 opto and a Teledyne 712-D TO-5 cased relay make me wonder about
this...

I'd like to get it back up and running. It might not take much. Thank you
in advance for any help!

73!

Mark




Here is a link to my iCloud photo album of the little beast:
https://share.icloud.com/photos/0OiFrYILpWMxvH5q9l0BYE-7Q. It's one
interesting little spud.

The boards? Right here, at the bottom of the page:
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