[ARC5] UHF Connectors

[jeepp]

Somwhere along the line, it may have been from Leo Young Sr. himself, that I gleaned that the connector was originally "designed" not by an RF engineer but a machinist.  The connector was coaxial in nature as the original cable provided as an example.  I also recall that the US did use Pye coax connectors very briefly on something in the early 40's?  Not referring to the WS-19, however.Jeep K3HVG


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-------- Original message --------
From: Tim <timsamm at gmail.com> 
Date: 5/13/18  19:43  (GMT-05:00) 
To: Mike Morrow <kk5f at arrl.net> 
Cc: ARC-5 List <arc5 at mailman.qth.net>, "Military Surplus Mail List (milsurplus at mailman.qth.net)" <milsurplus at mailman.qth.net> 
Subject: Re: [ARC5] UHF Connectors 

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,,
TimN6CC

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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