MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner Instruction & Technical Manual
Figure 2: The Electromagnetic Spectrum
1.3 RF PRECAUTIONS
The FCC Office of Engineering Technology (OET) Bulletin 65, Supplement B, Evaluating
Compliance with FCC Guidelines for Human Exposure to Radio frequency Electromagnetic Fields
directly impacts the use and operation of the MFJ-936C Deluxe High-Efficiency Magnetic Loop
Tuner™. It establishes safe operating distances from the loop antenna and associated power levels
in order to permit the operator and persons that may be impacted by operation to exist in a safe
RF environment. Guidelines for Maximum Permissible Exposure (MPE) are defined in Supplement
B of the bulletin.
IMPORTANT NOTICE
Use Supplement B in connection with FCC OET Bulletin 65, Version 97-01. The infor-
mation in the supplement provides additional detailed information used for evaluating
compliance of amateur radio stations with FCC guidelines for exposure to radio frequency
electromagnetic fields. However, Supplement B users should also consult Bulletin 65 for
complete information on FCC policies, guidelines and compliance-related issues. Def-
initions of terms used in this supplement appear in Bulletin 65. Bulletin 65 can be
viewed and downloaded from the FCC’s Office of Engineering and Technology’s website
at https://www.fcc.gov/general/radio-frequency-safety-0.
1.4 OPERATING ENVIRONMENTS
Under some circumstances, such as an antenna located unusually close to humans, an indoor
antenna in a living space, or a balcony-mounted antenna a foot or so away from a neighbor’s
balcony, the FCC could require a station evaluation or take other action. Computer models of
small HF loops, for example, yield RF fields very near the antenna that are much higher than the
standard amateur radio station outdoor antenna installation fields. Therefore, when you use the
MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner™ in your shack, at a portable location, or
in a hotel room, care must be taken not to exceed established MPE to yourself and others who
may encounter the RF field associated with your operation.
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