Operating instructions

MFJ-933 Loop Tuner
TM
Instruction & Technical Manual
- 3 -
RF HAZARD PRECAUTIONS
FCC OET Bulletin 65, Supplement B, Evaluating Compliance with FCC
Guidelines for Human Exposure to Radio frequency Electromagnetic
Fields.
The FCC Office of Engineering Technology (OET) Bulletin 65, Supplement B,
Evaluating Compliance with FCC Guidelines for Human Exposure to Radio
frequency Electromagnetic Fields impacts directly the use and operation of the
MFJ-933 Loop Tuner
TM
. 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 radiation hazard-free
environment. Guidelines for Maximum Permissible Exposure (MPE) are defined
in Supplement B of the bulletin.
IMPORTANT NOTE
Use Supplement B in connection with FCC OET Bulletin 65,
Version 97-01. The information 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. Definitions 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 World Wide Web Internet Site:
http://www.fcc.gov/oet/rfsafety
OPERATING ENVIRONMENTS
Under some circumstances, such as an antenna located unusually near 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 yields. Therefore, when you use the
MFJ-933 Loop Tuner
TM
in your Ham Shack, at a portable location (outdoors), or
one such as a hotel/motel room care must be taken not to exceed established
MPE to yourself and others who may encounter the RF field associated with your
operation.