Cobra Electronics MR F80B-D - Manual (Page 13)

Nothing Comes Close to a Cobra ®
Antenna Requirements
and Attachment
19 18 English
Mounting and
Powering the Radio
Installation and Start-Up Installation and Start-Up
NOTE
All wiring is best kept as short as possible. If the power leads must be
extended, use a high-quality, marine-grade cable sized for up to 10 amps
of current. To minimize voltage drop, choose a wire gauge as follows:
Length Wire Gauge
Up to 1.5m(4.9ft) 1.6 mils(#14)
Up to 3.0m(9.8 ft) 2.0 mils(#12)
Up to 5.0m(16.4 ft) 2.6 mils(#10)
Up to 6.0m(19.7 ft) 3.3 mils(#8)
Antenna Requirements and Attachment
•
Antenna Requirements
Your CobraMarine VHF radio requires an external marine antenna
to send signals into the air and to receive them. The radio is arranged
to use any of the popular marine VHF antennas, but it is up to you to
choose which antenna to use.
Since it represents the link between your radio and the outside world,
Cobra suggests you purchase the best quality antenna, coaxial cable
and connectors you can. This is best accomplished with the advice
and guidance of a knowledgeable dealer who can assess the variables
involved with your particular boat and preferences.
WARNING
Compliance with FCC requirements for Radio Frequency Exposure is
the responsibility of both the antenna installer and the radio operator.
Safe Maximum Permissible Exposure (MPE) Radius
To avoid health hazards from excessive exposure to RF energy, FCC OET
Bulletin 65 establishes an MPE radius of 10 ft (3 m) for the maximum power
of your radio with an antenna having a maximum power gain of 9 dBi.
This means that all persons must be at least 10 ft (3 m) away from the
antenna when the radio is transmitting.
Installation Requirements
■
An omnidirectional antenna with a gain not greater than 9 dBi must
be mounted at least 16.4 ft (5 m) above the highest deck where people
may be during radio transmissions, measured vertically from the lowest
point of the antenna. This provides the minimum separation distance
to comply with RF exposure requirements and is based on the MPE
radius of 10 ft (3 m) plus the 6.6 ft (2 m) height of an adult.
■
For vessels without structure to mount the antenna as described in A,
it must be mounted as follows AND all persons must be outside the
10 ft (3 m) MPE radius during radio transmissions. The antenna must
be mounted so that its lowest point is at least 3.3 ft (1 m) vertically above
the heads of all persons during radio transmissions.
MRF80BD_MANL_INSTALL:QXP-1058720374.qxp 12/9/10 10:34 AM Page 30