MFJ MatchMaker 212, Quick Start Manual

MFJ-212 

MatchMaker

™ 

Introduction 

This new MFJ-212 

MatchMaker

™ lets you tune up your antenna tuner without 

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

1:1 SWR

 - no additional 

"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 

Match Maker

TM

connects between your transceiver and antenna 

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 

Match Maker.

TM .

Use a 

standard 2.1 mm coaxial plug with the center being positive and the sleeve being 
ground. Ensure that the 

POWER

 switch on the front panel is in the 

OFF 

position 

(out), then connect the power supply to the 

POWER

 jack on the rear panel. 

Note

: The MFJ-212 may also be powered by a 

9V alkaline battery

. to access 

the battery connector, ensure the 

POWER

 switch on the front panel is in 

the 

OFF

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

remove the cover. 

Be sure to replace the cover before operating the 

unit! 

Connect the 

Antenna out

 jack on your transceiver to the 

TRANS

 jack and 

antenna tuner to the 

ANT

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

and tune to the desired frequency. Next, apply power to the MFJ-212 by 
pressing the 

POWER

 switch in. The 

PWR

 LED on the front panel of the MFJ-212 

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 

1:1 SWR! 

Your antenna is now 

matched

 to your transceiver! 

Remember to turn the power to the MFJ-212 

OFF

 before using your transceiver. 

                       MFJ-212 Front Panel