VHF Transmitter Ampli
fi
er Instruction Manual
IM21-VT3150AMP
iii
RF Exposure Warning
Exposure to radio frequency (RF) energy has been identi
fi
ed as a potential environmental factor that must be
considered before a radio transmitter can be authorized or licensed. The FCC has therefore developed maximum
permissible exposure (MPE) limits for
fi
eld strength and power density, listed in FCC 47 CFR § 1.1310. The
FCC has furthermore determined that determination of compliance with these exposure limits, and preparation
of an Environmental Assessment (EA) if the limits are exceeded, is necessary only for facilities, operations and
transmitters that fall into certain risk categories, listed in FCC 47 CFR § 1.1307 (b), Table 1. All other facilities,
operations and transmitters are categorically excluded from making such studies or preparing an EA, except as
indicated in FCC 47 CFR §§ 1.1307 (c) and (d).
Revised FCC OET Bulletin 65 (Edition 97-01) provides assistance in determining whether a proposed or existing
transmitting facility, operation or device complies with RF exposure limits. In accordance with OET Bulletin 65
and FCC 47 CFR § 1.1307 (b), this Daniels Electronics Ltd. transmitter is categorically excluded from routine
evaluation or preparing an EA for RF emissions and this exclusion is suf
fi
cient basis for assuming compliance
with FCC MPE limits. This exclusion is subject to the limits speci
fi
ed in FCC 47 CFR §§ 1.1307 (b) and 1.1310.
Daniels Electronics Ltd. has no reason to believe that this excluded transmitter encompasses exceptional
characteristics that could cause non-compliance.
Notes: •
The FCC’s exposure guidelines constitute exposure limits, not emission limits. They are relevant to
locations that are accessible to workers or members of the public. Such access can be restricted or
controlled by appropriate means (i.e. fences, warning signs, etc.).
• The FCC’s limits apply cumulatively to all sources of RF emissions affecting a given site. Sites
exceeding these limits are subject to an EA and must provide test reports indicating compliance.
RF Safety Guidelines and Information
Base and Repeater radio transmitters are designed to generate and radiate RF energy by means of an external
antenna, typically mounted at a signi
fi
cant height above ground to provide adequate signal coverage. The
following antenna installation guidelines are extracted from Appendix A to OET Bulletin 65 and must be adhered
to in order to ensure RF exposure compliance:
Non-building-mounted Antennas:
Height above ground level to lowest point of antenna
≥
10 m or
Power
≤
1000W ERP (1640 W EIRP)
Building-mounted Antennas:
Power
≤
1000 W ERP (1640 W EIRP)
The following RF Safety Guidelines should be observed when working in or around transmitter sites
:
• Do not work on or around any transmitting antenna while RF power is applied.
• Before working on an antenna, disable the appropriate transmitter and ensure a
“DO NOT USE” or similar sign is placed on or near the PTT or key-up control.
• Assume all antennas are active unless speci
fi
cally indicated otherwise.
• Never operate a transmitter with the cover removed.
• Ensure all personnel entering a transmitter site have electromagnetic energy awareness
training.
For more information on RF energy exposure and compliance, please refer to the following:
[1]
FCC Code of Regulations; 47 CFR §§ 1.1307 and 1.1310.
[2]
FCC OET Bulletin 65, Edition 97-01, “
Evaluating Compliance with FCC Guidelines for
Human Exposure to Radiofrequency Electromagnetic Fields
”.
[3]
http://www.fcc.gov/oet/rfsafety/
