[GreenKeys] Anybody identify this item?

[Jeffrey Golas]

Its a TU like any other, but correct me if Im wrong, but it derives the signal from the difference of two other signals.

Jeff

> On Nov 2, 2020, at 9:16 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:
> 
> 
> ebay 193729769207
> 
> 
>    ---
> 
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