[GreenKeys] jack field polarity?

[Harold Hallikainen]

On Fri, January 20, 2023 11:16 am, Paul Heller wrote:
> Your email made me recall a learning experience years ago. I needed to
> extend a loop. I bought a 1/4 female-female adapter. I hooked it all up
> and all was fine. The cable and adapter were laying on the concrete floor.
> Some days later I picked up that adapter. Did I mention the adapter was
> metal? I think you can guess the rest of the story.
>
> Paul

Even if the shell is not metal, a lot of telco plugs have a brass screw
that holds the plastic cover on the plug. That screw is connected to the S
and might be hot.

Harold
https://w6iwi.org