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



3 comments:

YC2LEV said...

can this antenna work on 1.8 MHz ? SWR ??
de yc2lev

Zaki Bin Din said...

yup, its work on 160m, swr 1.1 after tuned..

Anonymous said...

Assalamualaikum Zaki
Too difficult to find ladder line here in Riau. Do you have a spare?

Budi - YB5OUB at RIAU