7
In some circumstances it can be useful to carry out the
search using the tuner - the Tuner Tracking Mode.
The antenna will then only lock on a satellite
transmitting a DVB-S signal on the preset frequency
with a certain symbol rate and FEC. These settings are
available from the PC-program only.
Tracking
When the signal level exceeds the threshold level during a search, tracking is
initiated. The antenna then uses a combination of gyroscopes and dish scan to keep
it pointed at the satellite.
The dish scan continuously rotates the antenna in a small angle around its aiming
point to correct for gyroscope drift. The signal is monitored either with a tuner set to
a specific frequency or with a signal detector via a bandpass filter. See section
Tracking mode
Signals from two of the four LNB outputs are tapped off and one fed to the tuner and
the other to the detector. Vertical low is the default LNB output for the detector and
horizontal high for the SatID.
Satellite identification
After locking on a satellite the ID-receiver attempts to identify it by matching the
transponder's network identifier code or NID with the antenna's internal list.
If the identified satellite is another one than selected, the correct position is
calculated and the antenna automatically repositioned. When a correct match is
made, "Confirmed" is written after the satellite name in the display.
Please see section Network IDs.
If the satellite remains unidentified, the antenna tries to acquire another
satellite.
Chapter 2: Functional description
Satellite identification
