Thursday, October 15, 2009

homebrew G5RV Multi Band

G5RV

A simple multiband antenna



Use this formula...
L (ft) = 492(n-.05)/ f(MHz) = 492 (2.95) / 14.151 = 102.57 feet
for example,

V.F = .95 for 450 Ώ ladder line
L = (492 x V.F)/f(MHz
L = (492 x .95)/14.50 MHz
L = 33.03 feet
Note: n = the number of half wave len
n = 3 half wave lengths
n = 3/2 λ

Dimensions for all G5RV Antennas

Bands : 1.8-28 MHz, 3.5-28 MHz, 7.0-28 MHz
Flat-top 204 ft102 ft51 ft
MATCHING LINES
Open wire : 67.3 ft, 34 ft, 17 ft
Ladder line: 62.4 ft, 31.5 ft 21.2 ft
"TV" twin lead 56.9 ft, 28.5 ft, 14.4 ft



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