03-14-2012, 02:02 AM
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Join Date: May 2010
Originally Posted by BOOTY MONSTER
from OGP's link G3ZPS HF radio antennas
"The 'Zepp' name came from the use of the antenna on Zeppelins in the 20's and 30's. Its a non resonant antenna which provides arounnd 3dB of gain over a dipole if mounted at the right height. Around 0.6 of a wavelength is ideal .
Each leg of the Zepp is 0.64 Wavelength (5/8) and must be fairly accurately cut, the formula I use is 599/f in MHz."
i thought antennas were supposed to always perform better when they were resonate . and this one is supposed to have more gain over a dipole than a 5/8 or .64 . the formula looks to be a bit shy of whats commonly thought of as a 5/8 WL , let alone a .64 .
599 / 26.965 = 22 ft
2 1/2 inches for channel 1
599 / 27.405 = 21 ft
10 1/4 inches for channel 40
it ain't easy being a dunce
Well, since the Germans probably used insulated, braided wire for strength & shorting resistance, I bet the velocity factor made it electrically longer than .6, perhaps .64?