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Coaxial Cable Socket
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Antenna Requirements
and Attachment
Electrical Power Connection
Your CobraMarine
™
VHF radio is powered
from the vessel’s 13.8 volt negative ground
direct current electrical system (12 volt
nominal). A fused power connection lead
is provided at the back of the transceiver.
To connect to a power source:
1. Attach the black power wire to a
negative ground.
2. Attach the fused red power wire to
the positive side of the power system.
CAUTION
A reverse polarity connection will damage the radio.
When replacing the fuse in your transceiver, use only the size and type
originally provided.
NOTE
Please ensure that the radio is disconnected from the battery via an accessory
switch or other means when not in use. 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
#14
Up to 3.0m
#12
Up to 5.0m
#10
Up to 6.0m
#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 Electronics
Corporation
™
suggests you purchase the best quality antenna, coaxial cable, and
connectors you can. This is best accomplished with the guidance of a knowledgeable
dealer who can assess the variables involved with your particular boat and preferences.
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Power Connection Cables
Red Cable
Positive (+)
Black Cable
Negative (-)
– +
28 English
29
Nothing
comes close to a Cobra
®
29
Antenna Requirements
and Attachment
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Cobra Electronics Corporation
™
recommendations for radio frequency exposure
are based upon the federal regulatory requirements in the U.S.A. Your country may
have different requirements. Ask your dealer or another knowledgeable person.
Compliance with recommendations 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, the U.S. FCC OET
Bulletin 65 establishes an MPE radius of 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 3 m away from the antenna when the radio is transmitting.
Installation Requirements
A) An omnidirectional antenna with a gain not greater than 9 dBi must be mounted
at least 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 3 m plus the 2 m height of
an adult.
B) 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 3 m MPE radius during
radio transmissions. The antenna must be mounted so that its lowest point is at
least 1 m vertically above the heads of all persons during radio transmissions.
Radio Operator Requirements
Do not transmit when anyone is within the MPE radius of the antenna unless that
person or persons are shielded from the antenna by a grounded metallic barrier.
This is especially important on vessels with antennas mounted as described in B
where no one may be within 3 m horizontally from the base of the antenna during
transmissions.
Failure to observe the above limits may expose those within the MPE radius to RF
energy absorption in excess of the recommended permissible exposure. It is the
radio operator’s responsibility to ensure that MPE limits are heeded and that no one
is within the MPE radius during transmissions.
Antenna Lead Attachment
Once the antenna is installed, the Coaxial Cable Lead can
be attached to the socket at the back of the transceiver.
CAUTION
Attempting to transmit without an antenna attached
will damage your CobraMarine
™
VHF radio.
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