NavCom SF-3050 Rev.A - Manual (Page 96)

SF-3050 User Guide – Rev A
4-94
 Antenna placement is critical to good system
performance. Avoid antenna shading by buildings,
rooftop structures, foliage, hills/mountains, etc.
 Locate the antenna where it has a clear view of
the sky, to an elevation angle of 7º if possible.
Obstructions below 15º elevation generally are
not a problem, though this is dependent on
satellite availability for the local region.
 Avoid placing the antenna where more than 90º
azimuth of the sky is obstructed. When more than
90º of azimuth is shaded, it is often still possible
for the reciever to navigate, however, poor
satellite geometry (due to satillte shading) will
provide poor positioning results. Even 10º of
shading can have a negative effect on
performance, though this generally is not the
case.
 Avoid placing the antenna on or near metal or
other electrically reflective surfaces.
 Do not paint the antenna enclosure with a
metallic-based paint.
 Avoid placing the antenna near electrical motors
(elevator, air conditioner, compressor, etc.)
 Do not place the antenna too close to other active
antennas. The wavelength of L5 is 0.255m and
G1 is 0.187m. The minimum acceptable
separation between antennas is 1m (39 in), which
provides 5.9dB of isolation. For 10 dB of isolation,
separate the GNSS antennas by 2.55m, and for
13dB of isolation (recommended) separate the
antennas by 5.1m.
 Active antennas (those with LNA’s or amplifiers)
create an electrical field around the antenna.
These radiated emissions can interfere with other
nearby antennas. Multiple GNSS antennas in