Operating instructions

MFJ-933 Loop Tuner

Instruction & Technical Manual

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Step 7

Once you are satisfied that the adjustments and settings are correct for minimum

SWR, you can advance the power to 150 Watts if desired. Be sure that MPE

distance standard as defined in Supplement B of the FCC OET Bulletin 65,

version 97-01 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 – 933, Loop Tuner, lower 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. Power levels of

20 to 50 Watts often provide very reliable communications. The difference

between 50 and 100 Watts is less than ½ S-Unit and is not noticeable on the

receiving end.

Step 8

You can now enjoy operating in your favorite mode. However, if you change

frequency more than about 5 KHz, you may find you’ll need to re-adjust the

TUNING controls for minimum SWR. Rotate TUNING 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 – 933 Loop Tuner System Operation instructions.

MFJ-933 Loop Tuner

System Accessories

Two Kits are available for use with the MFJ-933 Loop Tuner

, and each

enables the operator expanded operational capabilities, and use of pre-

made/fabricated wires and equipment. These kits are:

• 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.

• MFJ-58B, which contains all of the MFJ-57 items, plus a 40-meter, 15 - 20

meter and 10 - 17meter wire loops, with clips to hang loops as needed.