[Premium-Rx] Why a 80 to 8000 Hz Loop Antenna?

[Brooke Clarke]

Hi:

While looking for patents related to the WJ-34903-2 HF Dual Loop I came across 
Raytheon, Lexington, MA patent 6600458 dated 2003 titled "Magnetic Loop Antenna".
http://www.raytheon.com/businesses/riis/

http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=6600458
http://www.google.com/patents?id=blEOAAAAEBAJ&dq=patent:6600458

It covers 80 to 8000 Hz and is a cube about one foot on a side.  There are 
three orthogonal loops.  It also includes a "data collection unit" that has a 
two way link to other equipment that's shown as a sub HF wireless link but can 
be about anything.   Also a switchable 50 or 60 Hz notch filter.

The antenna is surrounded with other loops that act as filters maybe broad 
enough to knock down 50 & 60 Hz.  Internal Li-poly battery and provision for 
external solar panel or thermal battery so not for subs.  Core is Styrofoam 
cube about one foot on a side, not ferrite.

The bandwidth is too wide for voice pickup from telephones.

What's this for?

-- 
Have Fun,

Brooke Clarke
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