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SIGSALY 1942 ADC recreation with tubes

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jonpaul:
Hello All:  Please see my SIGSALY 1942  ADC recreation with tubes, in February IEEE Spectrum:

Printed magazine has the first link article.

https://spectrum.ieee.org/geek-life/hands-on/rebuilding-a-piece-of-the-first-digital-voice-scrambler
https://spectrum.ieee.org/geek-life/hands-on/sigsaly-analogtodigital-converter-construction-and-debugging

Your comments and feedback appreciated.

Jon


tooki:
Neato!!!

As it happens, last year I visited both the National Cryptologic Museum, with its (shrunken) SIGSALY exhibit, as well as the Churchill War Rooms museum, with the "WC" room where Churchill's SIGSALY terminal was. :)

Alex Eisenhut:
Great idea. SIGSALY is one of those "wow" things that really should be recognized more.

tooki:
I think it's largely unrecognized because it's largely unknown. A sad consequence of bleeding-edge technology often being top-secret is that we can't find about it till it's long, long, long obsolete. It must be incredibly frustrating for the engineers, too, to be unable to talk about their achievements, even if they knew it was a major breakthrough. Or to see someone in the private sector get a patent for your invention decades after you invented it, because your prior art is classified. (I know of some example of that, but it escapes me at the moment…)

Alex Eisenhut:

--- Quote from: tooki on February 14, 2019, 12:40:13 am ---I think it's largely unrecognized because it's largely unknown. A sad consequence of bleeding-edge technology often being top-secret is that we can't find about it till it's long, long, long obsolete. It must be incredibly frustrating for the engineers, too, to be unable to talk about their achievements, even if they knew it was a major breakthrough. Or to see someone in the private sector get a patent for your invention decades after you invented it, because your prior art is classified. (I know of some example of that, but it escapes me at the moment…)

--- End quote ---

The proximity fuze from WWII and the F-14 CADC come to mind, although the CADC is probably better known than the fuze and SIGSALY.

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