9711-92 Ku-Band TXRX
Installation Troubleshooting
17-11
•
To drive the level motor, key in
^
2064,
^
2128 or
^
2192 and press
ENTER
to drive the level axis
FORWARD, OFF or BACKWARD respectively.
•
To drive the azimuth motor, key in
^
3064,
^
3128 or
^
3192 and press
ENTER
to drive the
azimuth axis CW, OFF or CCW.
17.3.9.
To Disable/Enable DishScan®
Tracking optimizes the pointing of the antenna, in very fine step increments, to maximize the level of the
satellite signal being received. DishScan® is the
default
mode of tracking.
To toggle the ON/OFF state of DishScan®, select the remote parameter DISHSCAN. This remote parameter
allows you to view, or change, the DishScan® ON/OFF status.
4.
Press UP arrow and ENTER to turn DishScan® ON.
5.
Press DOWN arrow and ENTER to turn DishScan® OFF.
6.
If you change this remote parameter, you must save the change using REMOTE PARAMETERS.
If DishScan® is
OFF
and the
Step Integral
parameter is set to
0000
, you will get a
constant
ERROR
0016
(DishScan® error) and you will see
zeros
flashing in the lower left of the Azimuth and Elevation ENTRY menu
displays. This is a visual indication that DishScan® is turned OFF.
When DishScan® is turned OFF, the system will NOT be able to properly track any satellite.
17.3.10.
Satellite Reference Mode
The ships gyro compass input to the ACU may be accurate and stable in static conditions and yet may NOT
be accurate or stable enough in some underway dynamic conditions. If there is no gyro compass or if the
input is corrupt, not stable or not consistently accurate the tracking errors will become large enough to cause
the antenna to be mis-pointed off satellite.
Satellite Reference Mode will uncouple the gyro reference from the azimuth rate sensor control loop. When
operating in Satellite Reference Mode changes in ships gyro reading will not directly affect the azimuth
control loop. The Pedestal Control Unit will stabilize the antenna based entirely on the azimuth rate sensor
loop and the tracking information from DishScan®. This will keep the azimuth rate sensor position from
eventually drifting away at a rate faster than the tracking loop can correct by using the tracking errors to
regulate the rate sensor bias.
Satellite Reference Mode can be used as a diagnostic mode to determine if tracking errors are caused by
faulty gyro inputs.
I t should normally be
OFF
as long as you have an accurate, reliable, gyro compass input available.
It
MUST
be
OFF
when the elevation angle is greater than 75 degrees. Above 75 degrees Elevation, the
ability of Sat Reference tracking to correct the Az Rate sensor bias begins to degrade, especially on a circular
C system.
Satellite Reference Mode
MUST be ON when:
•
No Gyro Compass is available.
•
The Gyro Compass input is noisy, occasionally inaccurate or occasionally unavailable.
•
Frequent or constant ACU Error Code 0001 (Gyro Compass has failed).
•
Using an
uncompensated
Flux Gate Compass.
To view, or change, the Satellite Reference Mode status,
select the SAT REF remote parameter:
1.
Press the RIGHT arrow, then press the UP arrow and last press the ENTER key to turn Satellite
Reference Mode ON.
2.
Press the RIGHT arrow, then press the DOWN arrow and last press the ENTER key to turn Satellite
Reference Mode OFF.
If you change this remote parameter, you must save the change using REMOTE PARAMETERS.
17.3.11.
To Read/Decode an ACU Error Code 0008 (Pedestal Function Error):
An Error Code 8 as reported by the ACU is an indication that the above decks equipment has experienced an
error. One of the functions available within the “
Comm Diagnostics
” tool window provides the means to
read and decode the actual discreet Pedestal Function Error.
Summary of Contents for 9711-92
Page 3: ......
Page 10: ...Table of Contents x 22 2 9711 GENERAL DRAWINGS 22 1 This Page Intentionally Left Blank ...
Page 22: ...Site Survey 9711 92 Ku Band TXRX 2 8 This Page Intentionally Left Blank ...
Page 62: ...Basic Setup of the ACU 9711 92 Ku Band TXRX 4 4 This Page Intentionally Left Blank ...
Page 64: ...Setup Ships Gyro Compass 9711 92 Ku Band TXRX 5 2 This Page Intentionally Left Blank ...
Page 66: ...Setup Band Select 9711 92 Ku Band TXRX 6 2 This Page Intentionally Left Blank ...
Page 72: ...Setup Home Flag Offset 9711 92 Ku Band TXRX 8 4 This Page Intentionally Left Blank ...
Page 80: ...Setup Searching 9711 92 Ku Band TXRX 10 6 This Page Intentionally Left Blank ...
Page 100: ...Antenna Specific Operation 9711 92 Ku Band TXRX 15 4 This Page Intentionally Left Blank ...
Page 104: ...Functional Testing 9711 92 Ku Band TXRX 16 4 This Page Intentionally Left Blank ...
Page 120: ...Installation Troubleshooting 9711 92 Ku Band TXRX 17 16 This Page Intentionally Left Blank ...
Page 142: ...Maintenance 9711 92 Ku Band TXRX 18 22 This Page Intentionally Left Blank ...
Page 160: ...Drawings 9711 92 Ku Band TXRX 22 2 This Page Intentionally Left Blank ...
Page 166: ......
Page 167: ......
Page 168: ......
Page 191: ......
Page 192: ......
Page 194: ......
Page 196: ......