NorthStar 1200-02-01, Installation Manual

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Section Two—Installation Instructions
PAGE 10 M3 GPS INSTALLATION MANUAL Revision D
.
For rotorcraft installations, the effects of the rotor blades on antenna per-
formance must be considered. Depending on the structure and mechanical
mounting considerations, the antenna may be located on the tail, in the
vicinity of the anti-collision light. Visibility of the anti-collision light must
not be impaired, however.
Approved GPS
antennas
Three GPS antennas are currently approved for use with the Northstar M3.
These are available as Northstar Part Numbers AN120 (Figure 4), AN135
(Figure 5), and AN155 (Figure 6).
NOTE:
The GPS signal is typically weaker than the background
noise. Electrical noise near the antenna can adversely affect
GPS performance. Antenna installation in close proximity to
traffic alert and collision avoidance system (TCAS), satellite
communication (SATCOM), and other transmitting antennas,
particularly “L” band, should be carefully evaluated for
potential mutual interference