MFJ-935C High-Efficiency Magnetic Loop Tuner Instruction & Technical Manual
SWR/Wattmeter. Readjust the TUNING control for maximum RF current. Repeat this sequence
until you see no further improvement in minimum SWR and maximum RF current. Be sure to
adjust the RF current meter to center scale using the METER SENSITIVITY control as you make
the other adjustments.
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-935C, lower output the 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 half of an 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–935C High-Efficiency Magnetic Loop
Tuner™ operating instructions.
5.3 MFJ-935C ACCESSORIES
Two kits are available for use with the MFJ-935C High-Efficiency Magnetic Loop Tuner/Antenna
Current Meter™, 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.
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