MFJ-933C
High-Efficiency Magnetic Loop Tuner
Instruction & Technical Manual
Step 6
Once you are satisfied that the adjustments and settings are correct for minimum SWR
and maximum antenna current, you can advance the power to 150 Watts if desired. Be sure that
MPE distance standard is met. Should any arcing be detected, stop transmitting and check
connections and proximity to objects that may be suspect. If arcing seems to be inside of the
MFJ-933C lower the output power and re-check for arcing.
As a courtesy to our fellow hams, for safety and to keep within FCC regulations you should use the
minimum power needed for communications. 20 to 50 watts often provides very reliable
communications. The difference between 50 and 100 watts is less than
1
/
2
S-unit and is not
noticeable on the receiving end.
Step 7
You can now enjoy operating in your favorite mode. However, if you change frequency
more than about 5 kHz, you may find you will need to re-adjust the TUNING controls for
minimum SWR. Rotate the TUNING control clockwise for higher frequencies and counter
clockwise for lower frequencies. Even greater frequency excursions can cause the MATCHING
control to also require adjustment. This concludes the MFJ–933C
High-Efficiency Magnetic Loop
Tuner
™
operating instructions.
5.3
MFJ-933C ACCESSORIES
Two kits are available for use with the MFJ-933C
High-Efficiency Magnetic Loop Tuner
™
, and
each gives the operator expanded operational capabilities and use of pre-made/fabricated wires
and equipment. These kits are:
•
the MFJ-57B, which contains a PVC Cross device for mounting a precut and lugged wire
loop to the top cover of the tuner. This flexible 10-gauge wire loop covers 20 and 30 meters,
and the ends have low-resistance lugs.
•
the MFJ-58B, which contains all of the MFJ-57 items, plus 40-meter, 15-20 meter, and 10-17
meter wire loops, with clips to hang loops as needed.
6
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 reading the manual does not solve your problem, you
may call MFJ Technical Service at (662) 323-0549 or the MFJ Factory at (662) 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., 300 Industrial Park Road,
Starkville, MS 39759; by Facsimile (FAX) to 662-323-6551; or by email to
. Send a thorough description of your problem, an explanation of
exactly how you are using your unit, and a complete description of your station.
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Summary of Contents for MFJ-933C
Page 18: ...USER NOTES ...
