MFJ -906 Instruction Manual

MFJ-906 Instruction Manual

General Information

MFJ's 6 Meter antenna tuner for the Magic Band gives you low SWR with
practically any coax-fed antenna:
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), depress 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
1
6-Meter Antenna Tuner
mobile whips, dipoles, verticals, vees,