MFJ-935C High-Efficiency Magnetic Loop Tuner Instruction & Technical Manual
1.5 RF RADIATION EXPOSURE CONCERNS
Controlled population exposure limits apply to amateur licensees and members of their immediate
household but not their neighbors. A controlled environment is defined as one for which access is
controlled or restricted. In the case of a fixed or portable amateur station, the licensee or grantee
is the person responsible for controlling access and providing the necessary information and
training as described in FCC OET Bulletin 65, Supplement B.
General population or uncontrolled exposure limits apply to situations in which the general public
may be exposed, or in which persons who are exposed as a consequence of their employment, such
as hotel employees or overnight residents, may not be made fully aware of the potential for
exposure or cannot exercise control over their exposure. Therefore, members of the general public
always fall under this category when exposure is not employment-related, as in the case of
residents in an area near a broadcast tower. Neighbors of amateurs and other non-household
members would normally be subject to the general population/uncontrolled exposure limits.
1.6 OPERATING ENVIRONMENTS & GUIDELINES
Tables 1 and 2 list MFJ-935C High-Efficiency Magnetic Loop Tuner/Antenna Current
Meter™ operating environments, average power level, and safe distances that should provide
compliance with the FCC’s MPE recommendations and standards for controlled and uncontrolled
populations. Distance data listed is a result of computer-modeling a circular loop, which is the
most efficient radiator configuration. Parameters used include those listed below:
• Loop perimeter: or circumference: 20% of a full wavelength for each band
• Diameter of loop conductor: #10 gauge wire
• Height of lowest section of loop above ground: 1 meter and 3 meters feedpoint heights
• Operating frequencies: 7.175, 10.1, 14.2, 18.1, 21.2, 24.95, & 28.5 MHz
• Output power: 100 Watts average for Table 1 and 150 Watts average for Table 2
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