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

[John, W9DDD]

I'd guess the board with the 2206 is the AFSK generator.

John, W9DDD

On 3/28/2020 6:02 AM, Mark Hall wrote:
> 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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