OPERATION
This antenna tuner operates slightly different than most manual tuners do. You will
notice that there are five tuning knobs on the front of the unit and one switch for the
power level and band selection.
The band selection and power switch simply adjust the sensitivity of the watt meter
to the correct frequency and power level indicated on the dial. It has no affect on the
tuning of the antenna. Simply select which band you will be tuning and the power
range that you will be using to get an accurate measurement of the swr and power level.
Tuning should be done at the lowest power level on the radio that still allows the meter
to indicate SWR levels. It is not required to have the selector switch in the correct band
for the tuner to function properly. The selector switch affects the meter readings only
and in no way affects the tuning of the load. Once you have tuned each band, you may
switch bands on the radio without changing the watt meter settings.
Tuning the two meter band is accomplished by adjusting the two knobs on the top row
as indicated by the 146MHz line connecting the dials. This operation is very similar
to tuning a normal T-match tuner. Adjust each knob for lowest reflected power reading.
After making adjustments to one knob, readjust the other and then go back to the
original and adjust it again. Do this back and forth method until a suitable SWR has
been obtained.
Tuning the 440 side of the tuner is much the same as the two meter side with the
addition of another knob. The three knobs across the bottom of the unit are used for
tuning the 440 band. Use the same method as tuning the two meter side. Go back and
forth to each knob until a suitable SWR is obtained. The additional knob will make
it a little more difficult but it will only take a little more experimentation and time.
This tuner is designed to match dual band or single band antennas in the two meter
and 70cm amature bands. Very large SWR values may not be in range of the tuner
and indicate a severe problem in the feed line or antenna system.
5
TE C H N IC AL AS S IS T AN C E
If you have any problem with this unit first check the appropriate section of this
m anual. If the m anual does not reference your problem or your problem is not
solved by reading the m anual you m ay call
M FJ Technical Service
at
662-323-
0549
or the
M FJ Factory
at
662-323-5869
. Y ou will be best helped if you have
your unit, m anual and all information on your station handy so you can answer
any questions the technicians m ay ask.
Y ou can also send questions by m ail to M FJ Enterprises, Inc., 300 Industrial
Park Road, Starkville, M S 39759; by Facsim ile to 662-323-6551; or by email to
techinfo@ m fjenterprises.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.
Содержание MFJ-923
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