Ive used them in Microwaves as well, mostly at 6 and 10 ghz.
We took two dishes and tied their feedhorns together with waveguide. They're mostly used near end to fill in dead spots, like in a building that's got good shielding. Theyre also handy for getting around something large and opaque like a building or a mountain. Since theres no amplification, results may vary.
We had a video feed from a downtown stadium that needed to go to a CARS relay tower and that path was blocked by a building. We shot the signal up to a taller building with the transmitter at the stadium, used a passive repeater, one dish pointed at the stadium and one at the tower and it worked fine. Again your results may vary.
Another one was the guards in a blockhouse at a prison couldn't use their UHF handhelds to talk to the prison repeater. We put a gain yagi on the roof, pointed it twords te repeater, drilled a hole down to the room, ran a cable and installed a quarter wave whip, upside down, again,worked marvelous.
One other method that bears mentioning, is what I call a passive splatter reflector. You use a high gain antenna on either end, and somewhere in the middle, off either side of LOS, where both places can see it, you put a piece of corrugated sheet metal. The corrugations make it an omni reflector, broadside to the face. (In practicalality, about 140-160 degrees of the 180). Put the panel up vertical or horizontal to accommodate your desired polarity. (Which I might add, is always opposite at the reflector, you'll want the reflector corrugations running vert for a horiz antenna on either end).
Marc
At 08:08 1/10/2004, you wrote:
On Jan 10, 2004, at 4:15 AM, Glenn Fleishman wrote:
I'm still waiting for him to explain his magic passive repeater, as are we all.
I have used back-to-back dish antennas with no amplification to get signal over a hill. This has long been used in microwave circles.
Brian Lloyd 6501 Red Hook Plaza [EMAIL PROTECTED] Suite 201 +1.340.998.9447 St. Thomas, VI 00802
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