MFJ-914 AutoTuner Extender
1
MFJ-914 AutoTuner Extender
General Information:
Does your automatic antenna tuner have limited matching range? Can't
auto-tune your antenna on all bands? Do you have to pre-tune your
antenna with a manual tuner?
The
MFJ-914
AutoTuner Extender
greatly extends your automatic
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 the flattest frequency response
and the lowest loss.
MFJ's
AutoTuner Extender
transforms your antenna impedence -- up
or 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
MFJ-914
also extends
manual
antenna tuners.
You can use any tranceiver from 160 through 10 meters with up to 300
watts.
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 AutoTuner Extender
is easy to use! First, bypass your
transmitters auto-tuner. Then, while transmitting at a
low output power
,
adjust the knob (from position
A
through
G
) on the
MFJ-914
until you see
minimum SWR on your transmitter. Now you're ready to autotune. The
Off / Dummy Load
position on the knob protects your tranceiver 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 transmitter to your antenna.
