Antenna
of the Month July.
6 Metre
Extended Double Zepp Antenna.
Components
required:
8 metres of enamelled
copper antenna wire ( or any good copper wire), and cut the wire in half
1 metre 450ohm ladder
line.
1:1 balun.
50 ohm coaxial cable.
Insulators and dipole
tee piece.
Measure 3.82 metres
from the end insulator and place the tee piece onto the copper wire leaving a
suitable tail for joining to the 450 ohm ladder line. When you have the two
dipole lengths joined to the tee piece, fit the 450 ohm line to the Tee piece, making
sure you have a good waterproof connection.
Measure from the top
of the 450 ohm line .82 metres at
the bottom of this length join the 1:1 balun again making sure you have a good
waterproof joing. The balun can be either a commercial 1:1 design or six turns
of 50ohm coaxial cable wound on a 25mm former. Join the the 50 ohm coaxial cable
to the balun and fit to the rig .
This antenna has a
gain of about 3dB over a dipole so you get x2 power out from the antenna.
Hoist your antenna as
high as you possibly can above ground for best results.
Have fun
With thanks to Radcom February
1999 and Robert Snary G4OBE.