[R-390] Mini BNC

[Tom Frobase]

Sorry for the brain dead reply, wrong connector, I guess I was thinking of
the r-390.  73, tom, N3LLL


On Wed, Apr 9, 2014 at 2:25 PM, Tom Frobase <tfrobase at gmail.com> wrote:

> Modern miniature COAX terminated with SMA connectors using SMA to BNC
> adaptors might be an acceptable substitute.  It should look good and be
> cost effective.  What do you think purists! ... tom, N3LLL
>
>
> On Wed, Apr 9, 2014 at 2:00 PM, Tisha Hayes <tisha.hayes at gmail.com> wrote:
>
>> 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*
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>
>