MFJ MFJ-906 User Manual

MFJ-906 Instruction Manual 6-Meter Antenna Tuner

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General Information

MFJ's 6 Meter antenna tuner for the Magic Band gives you low SWR with

practically any coax-fed antenna: mobile whips, dipoles, verticals, vees,

random wires, beams.

With low SWR, your rig will be more efficient; you'll get more power out of

your 6 meter transceiver and into your antenna for more DX, it will run cooler

and last longer, and your expensive transceiver will be protected from

overheating due to high SWR.

A lighted Cross-Needle SWR/Wattmeter shows SWR, forward and reflected

power simultaneously in 300/60 forward and 30/6 reflected Watt ranges and has

an ON/OFF lamp switch. With a built-in bypass switch, you can bypass your

tuner and connect your transceiver directly to your antenna.

The MFJ-906 handles 100 Watts FM and 200 Watts SSB PEP. It works with all

solid state and tube rigs and is perfect for home and mobile use. The MFJ-906

measures 8" x 2 1/2" x 3". The meter lamp uses 12 Vdc.

Installation

The MFJ-906 installs between your 6 meter transceiver and your antenna.

Connect the MFJ-906's TRANSMITTER SO-239 to your 6 meter transceiver,

and the ANTENNA SO-239 to your antenna. The meter lamp is powered by

12Vdc, through the POWER jack on the rear panel. Use an optional MFJ-

1312B or another power transformer that provides 12V, 300 mA.

Operation

1. Ensure that the TUNER switch on the front panel is depressed in to the

TUNE position.

2. For high power transmitters (30 Watts and up), d epress the METER switch

in to the HI position. For less than 30 Watts, this switch should be out, in

the LO position.

3. Set TRANSMITTER and ANTENNA controls to 5 (capacitors half

opened).

4. Apply enough transmitter power to give an adequate indication on your

SWR meter. Do not apply full power while tuning for minimum SWR!

5. Referring to the cross-needle meter on the front panel, adjust the

TRANSMITTER control for a drop in SWR.

6. Adjust the ANTENNA control until minimum SWR is achieved.

Note

: Ignore the bottom scale

MFJ-856 Instruction Manual Directional AC Line Noise Meter

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Note

: Since the TRANSMITTER and ANTENNA controls interact, they must

be adjusted alternately until minimum SWR is obtained.

7. To bypass the MFJ-906, place the TUNER switch on the front panel out to

the BYPASS position.

MFJ-906 Front Panel

MFJ-906 Rear Panel

TECHNICAL ASSISTANCE

If you have any problem with this unit first check the appropriate section of this

manual. If the manual does not reference your problem or your problem is not

solved by reading the manual you may call MFJ Technical Service at 662-323-

0549 or the MFJ Factory at 662-323-5869. You will be best helped if you have

your unit, manual and all information on your station handy so you can answer

any questions the technicians may ask.

You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial

Park Road, Starkville, MS 39759; by Facsimile to 662-323-6551; or by email to

[e-mail]. Send a complete description of your problem, an

explanation of exactly how you are using your unit, and a complete description

of your station.