[ARC5] UHF Connectors

[Tim]

Hi Mike - good info.   Just curiosity..The "early stuff" didn't have them,
some later stuff did, so I was wondering when the technology forced the
change.  Apparently all driven by vacuum tube improvements that permitted
operating at the higher freqs.  A lot was going on over a short time period!

Thanks,,
Tim
N6CC

On Sun, May 13, 2018 at 3:26 PM, Mike Morrow <kk5f at earthlink.net> wrote:

> > Speaking of "UHF" connectors, anyone know which was the first
> > (US?) equipment that used an SO-239 "UHF" type connector?
> > Tim N6CC
>
> Some data;
>
> The SO-239 (navy type-49194) connector was not yet listed in the 1940
> Signal Corps General Catalog.  The Navy Type Number Table shows the
> nt-49194 being added in June 1942.
>
> The USN's 1940 ZB and ZB-1 246 MHz "UHF" homing adapters utilized an
> early-style coax connector, but the 1942 ZB-2 and ZB-3 adapters use
> nt-49194 (SO-239) connectors.
>
> The ZB-homing system (and YE transmitter) employed a frequency band (234
> to 258 MHz) that was near the highest used by any military set in 1940.
> That would have made the development of a suitabble coax transsmission line
> and connectors attractive for use as soon as possible in ZB/YE homing
> setz.  That UHF connector system is used the ZB-2 and ZB-3.  It is likely
> that those were among the first sets using SO-239-family connectors.
>
> That's my candidate system.  What's yours?  Why do you ask?
>
> Mike / KK5F
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