Operating instructions

MFJ-933 Loop Tuner

Instruction & Technical Manual

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RF HAZARD PRECAUTIONS

RF RADIATION EXPOSURE CONCERNS

Controlled population exposure limits apply to amateur licensees and members

of their immediate household (but not their neighbors - see next paragraph). In

general, a controlled environment is 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/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/motel 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.

OPERATING ENVIRONMENTS & GUIDELINES

Table 1 and Table 2 lists MFJ-933 Loop Tuner

operating environments,

average power level, and safe distances that should provide compliance with the

FCC’s MPE recommendations/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 (75% of a quarter wave loop in length for

each band)

• Diameter of loop conductor (approximately 4mm/10 gauge)

• Height of lowest section of loop above ground (1 and 3 meters feed-point

heights)

• Operating frequencies (7.175, 10.1, 14.2, 18.1, 21.2, 24.95, & 28.5 MHz)

• Output power in watts (100 Watts average for Table 1 and 150 Watts

average for Table 2)