[GreenKeys] SG-1186/GGM-21A Manual? Info?

[Jeff G]

"sees low level output and suddenly seethes with low-level-tty Jealousy"

AHEM anyway...

EIA is likely RS-232 pinout, I'd think the IO jack is likely a repeat of
the front considering the switches above. Not sure why there's two EIA
jacks.

Very cool grab! Pretty sure I saw this and quickly scrolled by as I'm
trying to save some $$ at the moment.

jeff

On Mon, Jul 28, 2025 at 5:45 PM W2HX <w2hx at w2hx.com> wrote:

> Anyone ever seen one of these? I just bought it on ebay and was hoping
> someone somewhere might have a manual. It generally looks understandable
> from the pictures (It hasnt arrived yet) but there are some DB25 connectors
> on the rear which I'd like more information on.
>
> https://www.ebay.com/itm/116703625635
> <https://www.ebay.com/itm/116703625635>
> Military Radio RTTY teletype An/ggm-21a Test Set Pulse Generator
> Sg-1186/ggm-21 a - eBay <https://www.ebay.com/itm/116703625635>
> Fast shipping. Very heavy steering box broke the box in shipping but the
> post office taped it up. Maybe consider better boxes. Anyway the part came
> in good order without damage. Part description was perfect, as used
> original in good condition. Direct M151A2 MUTT replacement. Price and value
> is unmatched compared to other sellers. Great transaction. Fast shipping.
> Great item. Recommend Seller ...
> www.ebay.com
>
>
>
>
> 73 Eugene W2HX
> My Youtube Channel: https://www.youtube.com/@w2hx/videos
>
>
>
>
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