7
Installation Preparation
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Potential Interference
For optimum EMC performance, we recommend that wherever possible:
• Humminbird equipment and cables connected to it are:
– At least 3 feet (1 m) from any equipment transmitting or cables carrying radio signals (e.g. VHF
radios, cables and antennas). In the case of SSB radios, the distance should be increased to 7 feet
(2 m).
– More than 7 feet (2 m) from the path of a radar beam. A radar beam can normally be assumed
to spread 20° above and below the radiating element.
•
The Radar scanner must be supplied from a separate power source from that used for engine start.
This is important to prevent erratic behavior and data loss which can occur if the engine start does
not have a separate battery or fuse panel.
Mounting Surface
The mounting surface must be flat, stable, and approximately parallel with the boat’s waterline.
•
Surface Thickness:
If the mounting surface is thin, a doubler should be added. If the mounting
surface is thick, longer bolts must be purchased separately.
•
Surface Angle:
The Radar beam from the Radar scanner is approximately 20° wide in the vertical
direction to give good target detection even when your vessel pitches and rolls.
Planing hull vessels, and some displacement hull vessels, adopt a higher bow angle when the vessel
is at cruising speed. This may raise the Radar’s main radiation angle, and can cause poor detection
of nearby targets. It may be necessary to compensate for the bow rise to ensure optimum target
detection. This can be achieved by fitting a wedge or washers between the mounting platform and
the base of the Radar scanner, so that the Radar beam remains parallel to the water line when the
vessel's bow rises at cruising speed.
CHIRP_Radar_Install_Manual_532523-1EN_A.qxp_Layout 1 8/11/16 10:48 AM Page 7
