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Figure 7.4.7b – Narrow Az. Line Scan Example
Even with these extra precautions, it is difficult to successfully acquire a target satellite with a relatively
weak broadband signal when it is located next to a newer, higher power satellite. In this case, it is
desirable to use a more selective satellite signal source such as a modem, DvB or beacon receiver.
7.4.8 Signal Source, Modem or Beacon Receiver
AvL offers an optional Satellite Beacon Receiver with almost every antenna system, but Satellite
Modems are typically supplied by our system integrator customers. The AAQ is compatible with a
large number of Satellite Modems and Beacon Receivers and they are the Signal Source of choice for
robust and reliable satellite acquisition. Their preference is based primarily on their ability to
confirm that the signal detected is originating from the target satellite and not one of its neighbors.
Modems usually lock exclusively on only the carrier associated with their particular network.
Narrowband satellite beacon signal frequencies, while not completely unique to each satellite, are
usually assigned in a way that helps differentiate close neighbors so when the receiver locks, the
antenna is pointing at the correct satellite. Modems that are designed to work with the AAQ
controller have an associated Appendix to be used with this manual.
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