Vine Antennas AS-HF-OCF-LITE | Lightweight OCF Dipole
Vine Antennas AS-HF-OCF-LITE
An Off-Centre Fed Dipole for
40M, 20M, 15M & 10M (no tuner)
30M, 17M, 12M (with tuner)
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
Where is it Resonant?
By careful design of the balun and feedpoint of the antenna, your AS-HF-OCF-LITE has the following SWR from 0 – 30MHz:
Bands: 40M, 20M, 15M, 10M (without ATU)
30M, 17M, 12M (with ATU)
Power: 100W Max
Overall Length 63 9″
Overall Length 19.3548m