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Why don't every American have this aerial ? It is beyond Big !
"Ian Jackson" wrote in message ... In message , XPye writes "Dave" wrote us For these loops, they are quoting a front-to-back ratio of 6dB. I was unaware that loops HAD a front-to-back ratio. -- Ian which side is the front? i wonder if art had anything with designing these? The front is at the halfside where the gammamatch is attached. So you point the thing with its sides closest to the gammamatcher. 6 dB is a power increase of 4 times gentlemen ! The are available in three sizes. It stays on your mind, doesn't it ? 6db f/b can also mean a signal DECREASE to 1/4 of the 'front' signal strength in the 'back' direction. it doesn't mean that there is gain in one direction, simply that more power is going one direction than the other. i can build a small loop and add a small vertical very close to it and generate probably 20-30db f/b ratio, but it's signal compared to a dipole or even a 1/4 wave vertical will suck... those antennas have been documented for many years, but no one bothers using them for transmitting, only for transmitter hunting as receive antennas. |
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