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MFJ-974HB - Bakanced Line Tuner - 300W 6-160M

MFJ-974HB - Bakanced Line Tuner - 300W 6-160M
Tuning & Matching Units

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The MFJ-974HB is a fully balanced true balanced line antenna tuner.

It gives you superb current balance throughout its very wide matching and frequency range.  

The MFJ-974HB gives you excellent current balance, very wide matching range (12-2000 Ohms) and covers 10-160M continuously including all WARC bands. Handles 300 Watts SSB PEP and 150 Watts CW.

Tuning is fast and easy - - just three tuning controls. You can even adjust for highly efficient broadband low-Q operation or use higher Q when you encounter extreme loads.

The MFJ-974HB tunes any balanced lines including 600 Ohm open wire line, 450/300 Ohm ladder lines, 300/72 Ohm twin lead - - shielded 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 MFJ-974HB is a fully balanced wide range T-Network using four gear driven 1000-Volt air variable capacitors and high-Q air wound tapped inductor for 80-10 Meters and separate inductors for 6 and 160 Meters. 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 T-Network to unbalanced operation. 

Key Features/Specifications:

  • 10-160M

  • Handles 300W PEP, 150W CW

  • Fully balanced 'T' match network

  • 1:1 current balun

  • Cross needle SWR/Wattmeter 30/300W ranges

  • Matches 600 Ohm open wire, 450, 300 Ohm ladder lines, 300/72 Ohm twin, coax & random wires

  • High-Q air wound tapped inductor

  • 4 gear 1000V air variable capacitors

  • 3 tuning controls

  • 12V DC illuminated meter

  • Size 190 x 152 x 203mm approx


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