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

[John Miles]

Actually I'm thinking of Ascenscion's "Flock of Birds" system.  Polhemus is
another RF mocap vendor.

-- john, KE5FX

> -----Original Message-----
> From: John Miles [mailto:jmiles at pop.net]
> Sent: Friday, September 12, 2008 4:47 PM
> To: premium-rx at mailman.qth.net >> Pemium Receivers
> Subject: RE: [Premium-Rx] Why a 80 to 8000 Hz Loop Antenna?
>
>
> 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?
> >
> >