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I'm thinking he wants it with SO-239 connectors on it and an auxiliary set of relay contacts used to mute a separate receiver when using a separate TX and RX. Very common in the older type of coaxial relays.
Unfortunately, these are getting difficult to find, most certainly the 120-volt version.
I recently finished rebuilding a 6-meter amp for a friend, it had 2 of these installed. I removed them and used an open frame relay mounted on the chassis.
He sold the OLD Dow-Key styles for like $200...
All the Best
Gary
Please advise me to what is a good replacement mic for my SR-497HPC... Answer: 497 is "wired like Cobra", so many choices available. That radio does not need a power mic, so purchase a stock "coffin style" mic with a decent cord, like the ones that Astatic uses. The Superstar DM-507 is my go-to. https://www.ebay.com/itm/3050474478...adANq91JSiEEnz8EGqPJRBloTgEyaVsBoCtoMQAvD_BwE $12.99 + .99 cent shipping.
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