Google Chrome - It's Very Good!
The waveguide can
This can was an old coffee can. Not the optimal choice due to the ribs in the can.
The can dimensions are:
98mm or 4 inches - Diameter
140mm or 5.5 inches - Length
40mm or 1 3/4 inches - Antenna mount distance from rear of can
31mm or 1 1/5 inches - Antenna height inside the can
*Note: These dimensions are not perfect for this frequency!!!
The parabolic dish
The dish is an old T. V. television satellite dish from the Bell ExpressVu service, plus a LNB.
The dish dimensions are:
505 mm or 19 3/4 inches - Height
460 mm or 18 inches - Width
USB WiFi Adapter
Take your waveguide can and cut a hole carefully with a strong knife where you measured the mount distance from the rear of the can. For the height measurement, don't cut, but take a marker and mark the measured distance from the top of the base where you cut the hole.
The hole should be just big enough for the USB WiFi antenna to fit snuggly into. We used duct tape around the hole to lessen the damage to the USB card, and to make the hole more snug.
Take your time - you want your USB card to fit tightly in the hole so it doesn't move around.
Replace the LNB back on the dish arm, and duct tape the base of the waveguide can onto the LNB where you cut the head off. Make sure that the hole for the USB card is facing up.
Place the USB WiFi card into the hole of the waveguide can, as far in so that the top of the USB card reaches the measured antenna height distance.
Connect the USB card to your computer.
There has been some debate on how to point the dish. This being an offset parabolic antenna (off center), the dish will usually look like it is pointed down as the signal bounces off the dish and reflects into the waveguide. Some people have said that this is wrong, and that the dish should be pointing up. While this may be true for earth orbiting satellites, this is not the case for this design's usage.
For best results use this outside from a high location, and raised off the ground.
Other antennas inspired by Wiffy Extreme
by Dean Nicholle
Yiftach Swery's WiFi King
Do you have any pictures of your Wiffy Extreme?
WE WANT TO POST THEM!
References to Wiffy Extreme
Dish provided by Paul / Derm / Pat Sweeney
Waveguide and dish construction by Jason Summers
Waveguide calculations - http://www.saunalahti.fi/elepal/antenna2.html
Offset dish angles - http://www.satsig.net/22-deg-offset-dish.htm
Collection of WiFi antenna construction pages - http://www.dxzone.com/catalog/Antennas/WiFi/