[R-390] Twinax Antenna Input 390A

[jhhaynes@earthlink.net]

Some of use a little gadget made for IBM-style computer networking.
Has a Twinax plug on one end, and a transformer in a little plastic
housing and a modular telephone jack on the housing.  I haven't made
any measurements, but the things seem to work fine across the HF range.

I don't know if they are still used.  At one time you could buy them
from companies that deal in miscellaneous computer stuff, and also
at surplus stores.

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jhhaynes at earthlink dot net