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Crestron SRD-ANT-4-PAK Antenna System
Aiming the Antenna
Refer to the documentation supplied with the tuner/radio for information on
observing signal strength. Adjust the antenna as required to maximize the signal.
XM Reception
XM has two satellites located in fixed orbital positions in the southern sky (at 115°
W longitude and 85º W longitude). These satellites each carry all of the XM
channels, so it is only required to have an un-obscured line-of-sight to one of these
orbital locations.
Initially set up the antenna with its orientation approximately due south, at an up
elevation angle of approximately 45º. Use this as the starting spot and peak the signal
reception for maximum on one of the XM satellites using the antenna alignment
menu in the radio. The “Appendix” lists exact magnetic azimuth bearings and
elevation pointing angles for many major cities throughout the US and Canada.
SIRIUS Reception
SIRIUS has three satellites in elliptical orbits that are constantly moving over the
earth in a “figure 8”. These orbits are arranged so that two satellites are always in
view at any point in time at relatively high elevation angles (from + 45° to almost
90°) in the sky. Your antenna should be aimed at the “cross-over point” of the
“figure 8”, or about 96.5° West Longitude and 46° North Latitude.
The table and figure below provide relative azimuth pointing guidelines for the
United States and Canada. Your antenna should be aimed for the “X” in the figure.
The “Appendix” lists exact magnetic azimuth bearings and elevation pointing angles
for many major cities throughout the US and Canada. Since the satellites’ positions
are constantly changing, signal strength will vary somewhat at different times of the
day.
SIRIUS Antenna Aiming Guidelines
AREA* ANTENNA AIMING DIRECTION NORTH AMERICA
AREA 1 Aim the antenna EAST, NORTHEAST, or SOUTHEAST
AREA 2 Aim the antenna NORTH or NORTHEAST
AREA 3 Aim the antenna NORTH or NORTHWEST
AREA 4 Aim the antenna WEST or NORTHWEST
AREA 5 Aim the antenna STRAIGHT UP at the sky
* Refer to the following illustration for approximate area definitions.
SIRIUS Antenna Aiming Areas, North America
Installation Guide – DOC. 6723A Antenna System: SRD-ANT-4-PAK • 7