Uncle! I give-in!
Thanks to all who educated me on the fact that there really is an RF
device, properly known as an Isolator. Having never worked on anything but
HF, where isolators apparently aren't common, I admit I'd never heard of
one. I have seen these "coax isolators" for HF advertised in magazines,
but I believe they're just ferrite bead baluns - renamed for the new
application.
Phil
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