MFJ MFJ-212 User Manual

MFJ-212 MatchMaker™

Introduction

This new MFJ-212

MatchMaker

transmitting a single milliwatt! You can't cause QRM - there's no radiated power.
You can precisely tune your antenna tuner for a
"tweaking" needed.

Protect your tranceiver and antenna tuner. Avoid dangerous overheating and
arcing caused by high SWR and long tune-ups. It's easy to use. Plugs between
your tranceiver and antenna tuner.

Adjust your tuner for a null in receiver noise by ear or by S-meter and you have

1:1 SWR

!

Tuning noise is modulated to make it easy to recognize.

And if you accidentally transmit, you won't burn up your MFJ-212

MatchMaker

™. MFJ's exclusive RF*Guard™ automatically bypasses your MFJ-

212 to prevent damage. Works with all tranceivers from 160 through 6 meters.

Installation and Operation

The MFJ-212
tuner. A 12 Vdc, 300 mA power supply such as the MFJ-1312B should be used
to provide a proper power source for the MFJ-212
standard 2.1 mm coaxial plug with the center being positive and the sleeve being
ground. Ensure that the
(out), then connect the power supply to the

Note

: The MFJ-212 may also be powered by a

the battery connector, ensure the
the
remove the cover.

unit!

Connect the Antenna out jack on your transceiver to the
antenna tuner to the
and tune to the desired frequency. Next, apply power to the MFJ-212 by
pressing the
should begin flashing and you should hear a pulsing "white noise" from your
receiver. Adjust your tuner for a null in receiver noise by ear or by S-meter and
you have
Remember to turn the power to the MFJ-212

Match Maker

POWER

OFF

position (out), remove the screw on each side of the MFJ-212 and

ANT

POWER

1:1 SWR!

switch in. The

Your antenna is now matched to your transceiver!

™ lets you tune up your antenna tuner without

1:1 SWR

TM

connects between your transceiver and antenna

switch on the front panel is in the

POWER

jack on the rear panel.

9V alkaline battery

POWER

switch on the front panel is in

- no additional

Match Maker.

OFF

TM .

Use a

position

. to access

Be sure to replace the cover before operating the

TRANS

jack and

jack of the MFJ-212. Apply power to your transceiver

PWR

LED on the front panel of the MFJ-212

OFF

before using your transceiver.

MFJ-212 Front Panel

MFJ-212 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
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 FAX to 601-323-6551;
through Compuserve at 76206,1763; 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.

601-323-0549

or the MFJ Factory at

601-323-5869

. You will