Capt. Geoffrey Thorpe wrote:
"Martin Gregorie" wrote in message
...
Big John wrote:
Mike

Make one for pennies and few Oz vs 2.2# and $139.95.

I did a search for info about Luneberg Lenses - found plenty of
definitions/explanations/units for sale but nothing on DIY Luneberg, how
to make a ball with a radially varying refractive index or sources of
materials with suitable refractive index gradations.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

A corner reflector is easy and effective...

http://www.westmarine.com/webapp/wcs/stores/servlet/producte/10001/-1/10001/142806/0/0/radar%20reflector/All_2/mode+matchallpartial/0/0

If you make one out of foam core board and aluminium foil, be sure to keep
all the angles at 90 degrees. The overall shape can be whatever you want.


--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.


Indeed. They've been discussed here in the past.

I think a Luneberg is not omnidirectional because the side with the
reflector on it will block incoming signals from that side, hence the
natty marine three-ball unit that gives 360 degree coverage. If I'm
right, you'd need to add another two balls (facing up and down) for
omnidirectional reflection.

OTOH a "spherical" corner reflector made from three equal sized disks of
of coreboard set at right angles (hence forming eight corner reflectors)
should be omnidirectional and probably lighter too.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |