From: Jack Smith
Subject: Re: Alan Blumlein site
References: <email@example.com> <firstname.lastname@example.org> <email@example.com> <6RWg9.101$Fc5.firstname.lastname@example.org> <email@example.com> <3D848658.firstname.lastname@example.org>
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Date: Mon, 16 Sep 2002 11:44:29 GMT
NNTP-Posting-Date: Mon, 16 Sep 2002 07:44:29 EDT
Organization: Cox Communications
On Sun, 15 Sep 2002 18:56:24 +0100, John Woodgate
>I read in sci.electronics.design that Charles DH Williams
> wrote (in email@example.com>) about 'Alan Blumlein site', on Sun,
>15 Sep 2002:
>>In article , John Woodgate
>>> >And some of it has been permanently lost. On last reading, there is
>>> >still no public record of how the Germans produced an incredibly narrow
>>> >radio beam to guide their night time bomber raids directly over targets
>>> >in England.
>>> That's surprising; many of the antennas were captured. I note that you
>>> say 'public record'. It's not easy to understand why that information
>>> should still be classified.
>>It isn't much of a secret as a web search for 'X-Gerät' or 'Knickebein'
>Does the web search actually disclose the *beam-forming arrangement*,
>which is what the OP says is still classified? IIRC, these systems
>worked at around 1 MHz = 330 m wavelength. You would need a BIG
>conventional antenna to get a narrow beam at that wavelength. Think 3 km
>= 2 miles!
Knickebein around 30 MHz, X-Gerat 67/75 MHz.
Chain Home radars were also around 30 MHz as I recall.