[R-390] Mini BNC

[Tisha Hayes]

Chris,
That is a 75 ohm connector. The R-390A connector was a bit of a freak. From
the very old literature I had found on it there seemed to be some
distancing from the idea of giving it any sort of electrical
characteristics.

A few years ago I went through the parts list for the R-390A and found the
national stock number for those dratted connections. After extensive
searching I was able to track it down to a very old catalog that showed the
commercial (non-mil) part numbers. It seemed like an afterthought. Right
now I cannot find what I did with that information, it is somewhere in my
collection of stuff. The same search process can be repeated, it was
tedious.

I bought a few scrap RF decks that were doorstops at a hamfest and an IF
deck that had been cannibalized for the filters so I picked up a set of
plugs and connectors. I bought some of that teflon coax from eBay and made
extension jumpers and I also made another so I could add a 9 KHz roofing
filter (one of those little torsional filters, really cute) between the RF
and IF decks.

It was frustrating enough that I was sorely tempted to tear out those
connectors and just put SMA connectors everywhere (that noise is Art
Collins rolling over in his grave). I ended up not doing that because these
poor radios have to endure enough hacks as it is.

--------------------------------

Yes, my callsign is a double-pun with an additional meaning AA-HA! and
"AAay four HAy" but the HA at the end is also the first two letters of my
last name "Hayes". In CW it makes a very distinctive sound (that some find
confusing when sent fast, like maybe my keyer was stuck with dits). [.- .-
...- .... .-]. (ooh, I would really want AA4EE).


Ms. Tisha Hayes. AA4HA

 *"There are many who live in the mountains and behave as if they were in
the town; they are wasting their time. It is possible to be a solitary in
one's mind while living in a crowd; and it is possible for those who are
solitaries to live in the crowd of their own thoughts."*
*-Amma Sarah of the Desert*