[ARC5] SCR-274 System

[MARK DORNEY]

The J-37 key is fine for most applications, and the SCR-274-N really wasn’t used all too much for CW ( it had the worlds worst cw key built into the pilots control box ), but the correct CW key to use in an Army Air Corps aircraft is the US Army Signal Corps J-8 “Flameproof” key.  The J-37 could be used if the J-8 was’t available. 

73

Mark D. 
WW2RDO

“In matters of style, float with the current. In matters of Principle, stand like a rock. “.   -   Thomas Jefferson   


> But Dave...your photo shows a USN Type 26003A key and not a USAAF J-37!  :-)  (I like both keys.  The 26003 is also myll favorite straight key.)
> 
> The Wikipedia ARC-5 has photos of all major components of the standard two transmitter and three receiver USAAF SCR-274-N and USN AN/ARC-5 (with AN/ARR-2) installations.  Those photos are ones that I made of some my sets in 2007 to replace the useless photos of ham-hacked junk that were earlier in the ARC-5 Wiki article.
> 
> I assemble these and all other military systems ONLY in their "in service" configuration.  Those ARC-5 Wiki photos include:
> 
> SCR-274-N
> Receivers BC-453-B, BC-454-B, BC-455-B
> Transmitters BC-457-A, BC-459-A
> Controls BC-450-A, BC-451-A
> Provides two HF command channels plus LF/MF beacon band.
> 
> AN/ARC-5 (with AN/ARR-2)
> Receivers R-4A/ARR-2, R-26/ARC-5, R-28/ARC-5
> Transmitters T-20/ARC-5, T-23/ARC-5
> Controls C-30A/ARC-5, C-38/ARC-5
> Provides one HF (fixed) and four VHF (crystal) command channels plus VHF ZB homing with six selectable modulating frequencies.
> 
> It's amazing how much more versatile and useful the above 1944 AN/ARC-5 was compared to the above 1942 SCR-274-N for similar size and weight.  Few hams have ever had any interest in the AN/ARC-5 in its typical "in service" configuration.
> 
> Mike / KK5F
> 
> -----Original Message-----
> From: David Stinson <arc5 at ix.netcom.com>
> Sent: Dec 29, 2023 9:39 AM--
> (photos)
> 
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