Vine Antennas AS-HF-OCF-40-HP | High Power Off Centre Fed Dipole

Vine Antennas AS-HF-OCF-40-HP

What’s an Off-Centre Fed Dipole?

A traditional Dipole is a half-wavelength radiator, fed in the Centre with two equal length legs, the Off-Centre-Fed Dipole is a Dipole whose feedpoint is at a point removed from the centre of the antenna.

A traditional dipole is fed in the centre with 50-ohm coax, or more correctly through a 1:1 balun, whereas the off-centre fed dipole is fed through a 4:1 balun.

Why Off-Centre Feed a Dipole?

By moving the feedpoint of the dipole from the centre to off-centre, we create a multi-band antenna with multiple resonant points. We also change the feedpoint impedance and therefore need a carefully designed balun to provide a match to 50 ohms.

A centre fed dipole is only resonant at one single frequency, the off-centre fed dipole is resonant on multiple frequencies.

Your AS-HF-OCF-40 has been tested for resonance and is resonant on the 40M, 20M, 15M and 10M amateur bands and needs no ATU.

The antenna also offers a reasonable match on the 12M, 17M and 30M amateur bands but must be used with an ATU

Specification

Bands:                                  80M, 40M, 20M, 15M, 10M
(without ATU)
30M, 17M, 12M
(with ATU)

Power:                                 1Kw pep Max

OCF 40

Overall Length 63′ 6″

Overall Length 19.3548m