Is the attached what you remember?
 
This was from Jack Hart (SK).
 
Tom Tillson

---------- Original Message ----------
From: Tom Hunter <[email protected]>
To: [email protected]
Subject: [GreenKeys] RS-232 to Polar Relay
Date: Mon, 16 Jan 2023 13:37:41 -0500

John,
 
A while back someone (and I cannot remember whom, because he deserves the credit.) Mentioned that a polar relay can be driven directly by an RS-232 output. Think about it, it is really a polar signal.
 
I am kicking myself because I never thought of something so obvious.
 
 
Tom N3CRK