[Milsurplus] Naval Aviation Navigation

[ampop at comcast.net]

Simple but very effective - if you can't collect it you can't break it.
Sort of like the spread spectrum signals of later years.  Simple in
that all you had to do was to correlate the morse code letter to a
bearing and and fly the reciprocal course to the carrier.  Nice.
BobW

-------------- Original message -------------- 
From: Unserviceable but Repairable <cosmoline at aa4rm.ba-watch.org> 

> > A few years back there was some discussion on BoatAnchors about the Navy 
> carrier based system that transmitted different letters for every so many 
> degrees of azmuith. 
> 
> Mighta been me & I dint elaborate this time. The AZ/LETTER table of the 
> day gave a letter for every 30 deg.s of yagi antenna heading - yes we 
> did copy the Japanese on the antenna. 
> 
> So you'd pick up letter 'M' every few 10s of seconds while ship-board 
> yagi spun. Your day-table said carrier's yagi @ 210 deg.s. So by 
> complementing the angle you'd find heading to ship was 30 deg.s (210-180) 
> 
> Yagi beamwidth less than 30 so unlikely you'd hear but one of the 12 letters 
> of the day. And if you got 2, you'd take the louder of two or average. 
> 
> I'm in awe of the elegant simplicity and code-crack resistancee. 
> 
> 'rm 
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