6 80 Metre Balanced Line Antenna Tuner
The MFJB is a fully balanced true balanced line antenna tuner. It gives you superb current balance throughout its very wide matching and frequency range.
For decades, the Johnson Matchbox has been the standard of comparison for balanced line tuners. But, it had a severely limited matching range and covered only 80, 40, 20, 15 and 10 Metres.
The MFJB is its successor. It meets today’s needs and even surpasses the Johnson Matchbox outstanding performance.
The MFJB gives you excellent current balance, very wide matching range( Ohms) and covers 1.8 through 54 MHz continuously including all WARC bands, 6 Metres and the new 60 Metre band. Handles 300 Watts SSB PEP and 150 Watts CW.
Tuning is fast and easyjust three tuning controls. You can even adjust for highly efficient broadband lowQ operation or use higher Q when you encounter extreme loads.
A large threeinch lighted CrossNeedle SWR/Wattmeter lets you read SWR, peak or average forward and reflected power all at a glance on 300 or 30 Watt ranges. A ground post is provided to ground one output terminal so you can also tune random wires and coax fed antennas.
Compact 7½Wx6Hx8D inches fits anywhere.
The MFJB tunes any balanced lines including 600 Ohm open wire line, 450/300 Ohm ladder lines, 300/72 Ohm twin leadshielded or unshielded. Superb current balance minimizes feedline radiation that can cause troublesome TVI and RFI, painful RF bites, mysterious RF feedback problems and radiation pattern distortion.
The MFJB is a fully balanced wide range TNetwork using four gear driven Volt air variable capacitors and highQ air wound tapped inductor for Meters and separate inductor for 6 Metres. The tuning components are mounted symmetrically to insure electrical balance.
A 1:1 current balun is placed on the low impedance 50 input side to convert the balanced TNetwork to unbalanced operation. The balun is made of 50 ferrite beads on RG Teflon™ coax to give exceptional and efficient isolation. It stays cool even at maximum power.
Balanced lines give extremely low loss.
Doublet, horizontal loop, vertical loop, quad, double extended Zepp, Lazy H, W8JK antennas all give efficient multiband operation when fed with balanced lines.
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