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Calculations cover a whip antenna with a maximum gain of 3dBi, worst case
frequency (30 MHz), full power and 100% duty cycle (transmitter always on)
considering the most conservative limits mentioned in:
• FCC OET Bulletin 65 (1997)
• Canada RSS102 (2010)
• Canada Safety Code 6 (2015)
Installation Example for 150W
1. A whip antenna with a maximum gain of 3 dBi must be mounted at least
12.3 ft. (3.71m) above the highest deck where people may be staying
during continuous radio transmissions. The distance is to be measured
vertically from the lowest point of the antenna. This provides the
minimum separation distance which is in compliance with RF exposure
requirements and is based on the MPE radius of 5.7 feet (1.71 m) plus the
6.6 ft. (2.0 m) height of an adult.
2. On vessels that cannot obey requirements in item 1, the antenna must be
mounted so that the lowest point of the antenna is at least 5.7 feet
(1.71m) vertically above the heads of people on deck and all persons must
be outside the 5.7 feet MPE radius during radio transmission.
• Always mount the antenna at least 5.7 feet from possible human
access.
• Never touch the antenna when transmitting.
• Use only authorized T&T accessories.
• Only allow trained and certified operators knowing about RF-energy
and hazards to operate the radio.
3. If the antenna has to be placed in public areas or near people with no
awareness of the radio transmission, the antenna must be placed at an
even greater distance. Consult the appropriate standard for exact limits,
depending on national specifications.
Failure to observe any of these warnings may cause RF exposure exceeding
above mentioned limits or create dangerous conditions.
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