MFJ-2014 OCFD 80/40 m
Dual-band 80/40 m OCFD dipole without a tuner, 37 m (122 ft), 1,500 W PEP, built-in Guanella choke
The MFJ-2014 is a dual-band OCFD dipole (off-centre fed) for 80 and 40 metres, designed by K1BQT, 122 ft long (about 37 m), rated for 1,500 W PEP in CW and SSB.
Product description
The radiator is full size and the Matchmaker feed block has an efficiency of over 98%. The NEC-modelled element presents the same impedance at the feed point on each band, and the feed points are compensated for typical mounting height, to achieve the lowest possible SWR without a tuner.
Normally an OCFD cut for 3.85 MHz resonates at 7.7 MHz; this design resonates at mid-band on both 80 and 40 metres. The built-in bifilar Guanella current choke provides over 30 dB of common-mode rejection on all bands, against pattern distortion, RFI and noise.
It provides a dipole pattern of about 6 dBi (ground-reinforced) on the fundamental and a 9 dBi full-wave cloverleaf on the second harmonic. The feed block is made of UV-resistant marine ABS, with steel hardware and a Teflon SO-239 connector. It can be installed as a flat-top or inverted V, with a recommended height of 35–70 ft (about 11–21 m).
Key features
Without a tuner.
CW and SSB.
Over 30 dB of rejection.
Efficiency over 98%.
Technical specifications
| Type | Full-size OCFD dipole |
| Bands | 80 / 40 m |
| Length | 122 ft (approx. 37 m) |
| Power | 1,500 W PEP CW/SSB |
| Gain | approx. 6 dBi on the fundamental, 9 dBi on the second harmonic |
| Choke | Bifilar Guanella, > 30 dB common-mode rejection |
| Connector | Teflon SO-239 |
| Feed block | UV-resistant marine ABS, steel hardware |
| Mounting | Flat-top or inverted V, height 35–70 ft |
HamRadioShop | HF antennas
