[Milsurplus] Yagi Antennas

[ersmar at comcast.net]

Gents:

     In the most glaring example of irony at the end of that war, the Yagi-Uda antenna was included on the Little Boy weapon as part of the radio altimeter circuit that triggered the detonation of the first atomic bomb over Japan.  


73 de
Gene Smar  AD3F
P.S.  That same issue of IEEE Transactions has an article about a 20M Yagi with a 100-foot long boom.  It was actually several collinear Rohn towers, pointed toward Asia from California, with several of the Yagi's elements atop each tower.  


 -------------- Original message ----------------------
From: "gl4d21a at juno.com" <gl4d21a at juno.com>
> Gang:
> 
> Was it on here where the statement was made something like Yagis were not used 
> before WW2?  Or do I have an incorrect recollection?  
> 
> I encountered an old issue of IEEE Transactions on Antennas and Propagation (ca 
> 1990) which has an interesting historical article about Profs. Yagi and Uda.  
> That use statement was correct when applied to Japan, but Yagis were used lots 
> of other places in other countries before 1942.  Another case of a prophet not 
> recognized in his own country---etc.
> 
> 73,
> George
> W5VPQ
> 
> 
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