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

[John Miles]

Motion capture.  Google Polhemus and "flock of birds."

-- john, KE5FX

> -----Original Message-----
> From: premium-rx-bounces at mailman.qth.net
> [mailto:premium-rx-bounces at mailman.qth.net]On Behalf Of Brooke Clarke
> Sent: Friday, September 12, 2008 4:28 PM
> To: premium-rx at mailman.qth.net >> Pemium Receivers
> Subject: [Premium-Rx] Why a 80 to 8000 Hz Loop Antenna?
> 
> 
> 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?
> 
>