[Milsurplus] Spoof countermeasure against Japarception of proximtyity fuze signals

[Kenneth G. Gordon]

On 13 Nov 2017 at 11:59, Bruce Gentry wrote:

> Just how possible was it to receive the signals from the fuzes when they were hurtling toward 
> you? The transmitters were of fairly low power, a good receiver would be needed, and even more 
> challenging, knowing where to tune for a signal that might only last for ten seconds or so. How 
> good was the state of the art for receiving UHF signals in 1944?

That was my question too.

> This question has come forward 
> to me in the past week when I saw a Hallicrafters S-36, found it interesting, and  wondered 
> if it was 
> worth trying to find one of my own.   

The latest Electric Radio Magazine has an article on the restoration of a Halli S-36A. 
Sensitivity in microvolts is not listed there, but the indication is that it was not all that 
"wonderful". 

Stability, after a good warm up was considered quite adequate in that article, though.

The author's S-36A (Navy RBK-15, actually), had an added RF stage to meet the Navy's 
requirement for low HFO radiation. He removed that and added a 6CW4 untuned grounded 
grid amp and improved the sensitivity by some 6 dB on all bands.

You may find his article of interest.

I did.

Ken W7EKB

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