[ARC5] A British Version of ZB?

[Bart Lee]

Yes, the Leakage Issue may not have been much of an issue in the distances
of the Pacific. But in the closer ranges in the Mediterranean perhaps the
thought of combat damage and leaking MF radiation had some effect on
design. The idea of the VHF ship-borne beacon certainly was to preclude
easy detection by the enemy of the vessel's location. This British choice
to avoid MF modulation may just be an early example of the European
tendency to employ the Precautionary Principle, although those at sea and
in the air probably didn't mind. Still,  it's a simpler, cheaper system
requiring no second BCB receiver in the tight confines of the Seafire
aircraft.

I have read that the US lost one or more submarines in the Pacific because
the subs used a conning-tower VHF radar that the Japanese were able to
detect and DF.  I am not aware of any combat losses attributable to the US
or UK VHF homing beacons.

73 de Bart, K6VK ##
-- --
Bart Lee

Texts only to: 415 902 7168

www.bartlee.com

{KV6LEE(at)gmail(dot)com} ##

<http://www.LawForHams.com>



On Wed, Apr 7, 2021 at 2:15 AM Tom Lee <tomlee at ee.stanford.edu> wrote:

> I completely agree with Hue. "Leakage" of the type described would be a
> non-issue.
>
> -- Cheers,
> Tom
>
> --
> Prof. Thomas H. Lee
> Allen Ctr., Rm. 205
> 350 Jane Stanford Way
> Stanford University
> Stanford, CA 94305-4070
> http://www-smirc.stanford.edu
>
> On 4/6/2021 23:19, Hubert Miller wrote:
> > Attachment #2 simply says the Brits used a lower modulating frequency
> than the US, supersonic meaning > 20,000 Hz.
> > Same idea as ARR-1, ARR-2, ZB: no audio to detect. However the risk of
> modulating frequency "leakage" seems to me
> > overblown.
> > -Hue Miller
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