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Installing the GPS antenna
M3 GPS INSTALLATION MANUAL Revision D
If the Northstar AN155 GPS antenna is used, it is necessary to
change a jumper wire inside the M3 unit to provide 12 volts to
the antenna. Contact the Northstar factory for details.
Mount the GPS antenna on the top of the fuselage as shown below in
Figure 3. Refer to Chapter Three of Advisory Circular 43.13-2A for prac-
tices, methods, and techniques. You must use an antenna that has been
approved for use with the Northstar M3. The antenna must be securely
grounded to the aircraft skin (remove any paint from the chosen location
on the skin).
FIGURE 3 — Typical GPS Antenna Mounting Location
Adequate isolation must be provided between the GPS antenna and any
transmitting antennas installed on the aircraft. Shadowing of the antenna
by aircraft structure can adversely affect operation of the GPS equipment.
Typically, a GPS antenna is located forward of the wings on the top of the
fuselage to minimize effects of the wings, tail, etc. during aircraft maneu-
vering.
Ideally, the antenna should be located in the clear (at least two feet from
any other antennas and at least three feet from transponder, DME, VHF,
and UHF transmitting antennas) and where it isn't shadowed by the verti-
cal stabilizer or the wings
Section Two—Installation Instructions
NOTE:
PAGE 9
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