Fcn 92: Antenna Calibrate - Optus S2 User Manual

FCN 92: ANTENNA CALIBRATE

6
FCN 9 2
Antenna Calibrate
STO
Start/Stop Automatic Tuning
CLR
(Hold) EXIT
Some of the antenna used with the Optus MobileSat S2
telephone are controlled by the handset. For this reason it is
necessary to calibrate the antenna periodically to ensure that
the transceiver provides the best steering control possible.
Motorised Mast Antenna
The Motorised Mast antenna can be calibrated to optimise the
control from the handset.
Note: Before calibrating the mast antenna, the vehicle should be stationary
and level with the antenna mounted vertically (except when using End Fire
method. Refer to page 80).
To Enter Function
FCN 9 2
To Start Calibration
This starts the automatic
STO
calibration procedure. The antenna
calibration completes within 20
seconds.
At the completion of the
calibration the display shows the
RSSI signal, plus the last known
elevation setting of the antenna.
The FCN 92 screen returns to a
state where adjustment can be
made using + or - buttons (up/down arrows on screen),
showing the elevation in degrees from the horizontal.
FCN 92
S72 MAST
Calibrate?
FCN 92
10
ELEV: 46
164
6
EXIT
CLR
Planar Antenna
The planar antenna has no steering control so does not
require calibration.
Manual Mast Antenna
The manual mast antenna does not require calibration while
in the field.
Marine Antenna
The marine antenna must be calibrated for adequate
operation of the antenna.
Read the complete instruction set before beginning
calibration of the marine antenna.
Preparation for calibration
It is vital that the antenna be installed in its permanent
position before beginning the calibration. The calibration of
the Gyro Compass inside the antenna relies on magnetic
fields to determine its relative position. Hence any distortions
in the field due to hard or soft irons in the installation must
be experienced by the antenna during its calibration process.
Calibration
To calibrate the antenna, you must turn the ship or vehicle in
two full circles over a period of at least 4 minutes on a
▲
relatively calm or smooth surface. If aboard a boat, seek
protected waters where the wind is light. The direction of the
turn is not important and the vehicle's track need not be a
perfect circle, but it must take at least 4 minutes to complete
– the rate of turn should not exceed 3 degrees per second.
If wind or wave action make it difficult to maintain the
required turning rate, it may be necessary to continue
through more circles. Remember to complete your circles in
no less than 4 minutes. You can't go too slowly, but you can
go too fast!
FCN 92: ANTENNA CALIBRATE
(Hold) Return to previous screen.
165