MFJ MFJ-914 User Manual

MFJ-914 Auto Tuner Extender""

MFJ-914 AutoTuner Extender

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General Information:

Does your automatic antenna tuner have limited matching range? Can't auto­tune your antenna on all bands? Do you have to pre-tune your antenna with
a manual tuner?

The

MFJ-914 AutoTuner Extender"'

tuner's matching range. Now you can match nearly any antenna
automatically!
The

MFJ-914 s a heavy duty, wide range impedence transforming device.

It has been carefully designed for t he flattest frequency re sp on s e an d th e
lowest loss.

MFJ's
down -- by as much as 10 times! The MFJ-914 puts nearly any
antenna into the matching range of your automatic tuner!
Extend your power range by transforming your antenna impedence so your
tuner can be used in a higher power Low-Q mode. The
manual antenna tuners.
You can use any tranceiver from 160 through 10 meters with up to
300 watts.

Auto Tuner Extender"' transforms your antenna impedence -up or

greatly extends your automatic

MFJ914 also extends

Installation:

The MFJ-914 connects in-line between your transmitter and antenna.
Connect your transmitters antenna output to the SO-239 connector
labeled Transmitter, and your antenna to the Antenna connector. For
maximum protection of your tranceiver, a 50 Ohm dummy load should be
connected to the plug labeled Dummy Load, and the Ground stud
connected to a

good RF ground.

Operation:

The

MFJ-914 Auto Tuner Extender

transmitters auto-tuner. Then, while transmitting at a low output power,
adjust the knob (from position A through G) on the
see minimum SWR on your transmitter. Now you're ready to autotune.
The Off / Dummy Load position on the knob protects your tra ncei ver by
connecting it to an external dummy load, and by grounding your
antenna to bleed off static. The switch position D provides a through
connection from your transmitte r to your antenna .

1

is easy to use! First, bypass your

MFJ-914 until you

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 601-323-0549 or the MFJ Factory at 601-323-

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., P.O. Bo x
494 , Missi ssippi State, MS 3976 2; by F AX to 60 1-323 -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 s tation.