MFJ MFJ-903 User Manual
MFJ-903 6 METER ANTENNA TUNER
General Information:
The MFJ-903 6 Meter Antenna Tuner for The Magic Band gives you low
SWR with practic ally any coax fed antenna -- mobile whips, dipoles, verticals,
vees, random wires, beams.
With low SW R, your rig will be more eff icient; you'll get more power out of
your 6 meter tranceiver and into your antenna for more DX, it will run cooler
and last longer, and your expensive tranceiver will be protected from
overheating due to high SWR.
The MFJ-903 handles 100 Watts FM and 200 W atts SSB PEP. It works with
ALL solid state and tube rigs and is perfect for home and mobile stations.
Installation:
The MFJ-903 installs between your 6 meter tranc eiver and your antenna. An
external Power/SWR meter is necessary for proper operation of the MFJ-903.
Connect your 6 meter transceiver to your Power/SWR meter . Then connect
the Power/SWR m eter to the
TRANSMITTER
coax from the antenna is then connected to the
MFJ-903.
SO-239 of the MFJ-903. The
ANTENNA
SO-239 of the
MFJ-903 Rear Panel
Operation:
1.
Set
TRANSMIITER
and
ANTENNA
controls to 5 (capacitors half
opened).
2. Apply enough transmitter power to give an adequate indication on
your SWR meter.
minimum SWR!
Do not apply full power while tuning for
3. Referring to your external Power/SWR meter, adjust the
control for a drop in SWR.
ANTENNA
control until minimum SWR is achieved.
4.
NOT
TRANSMITTER
Adjust the
Since the TRANSMITTER and ANTENNA controls interact, they
must be adjusted alternately until minimum SWR is obtained.
E
5. After minimum SWR is achieved, check output power with a
voltmeter, relative power meter or with an antenna current meter.
Tune the
ANTENNA
tuner for maxim um power output; make sure
SWR is at minimum.
MFJ-903 Front Panel
Technical Assistance
If you have any problem with this unit first check the appropriate section of
this manual. If the m anual 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 have your unit, manual and all infor mation 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 76206.1763@Compus erve.com.
Send a complete description of your problem, an explanation of exactly how
you are using your unit, and a complete description of your station.
. You will be best helped if
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