Owner: VSAT for Marine URL:http://autotrack-vsat.blogspot.com Join Date: Thu, 31 May 2007 03:46:38 -0500 Rating:0 Site Description: Autotrack VSAT technology that used for Marine, Maritim, Ship and Associate Site statistics:Click here
Operation 2007-06-15 22:33:00 Normal System Operation
Normal operation of the system from a cold start involves the following steps :Turn on the AC Power switches for the ACU and the Radio packages. Press the RESET button on the ACU front panel to initialize the system and show the current DAC-97 software version. Wait 1-2 minutes for the antenna to initialize. After initialization the display will show the model and software version of the (remote) PCU.Press SHIP to select the ship's position displays. Press SHIP again to select the LAT entry mode. Key in the ships Latitude to the nearest degree. Pressing the decimal key can enter tenths of a degree. Use the NS/EW key to set the correct hemisphere. Press ENTER to save the entry. Press ENTER again to select the LON entry mode. Key in the ships Longitude. Press ENTER to save the entry.Press ENTER again to select the HDG entry mode. Key in the ships heading if using an SBS or 36:1, 90:1 or 360:1 synchro gyro interface. Do not enter a ships heading for s
Antenna Control Unit 2007-06-17 18:40:00 Antenna Control
Unit's front panel consists of :Vacuum fluorescent (VF) displayKeypadLED enunciatorsFront Panel Layout & DisplaysPower-Up Display = On power-up the 4 line blue plasma display initially displays the Sea Tel controller model and software version, then “Remote Initializing” if the antenna is in the process of power-up cycle also, and finally the remote PCU model and software version will be displayed.AUX1 & AUX2 = Sequential pressing of the AUX1 key toggles tracking ON/OFF. As a shortcut to “Save New Parameters” (bypassing the password) press & hold the AUX2 key and press the “C” key on the numeric keypad.Ship Displays = Initial display of all present settings of the information listed below. Sequentially pressing the Ship key will access entry mode for each of these displays to enter, or correct, the desired setting :LAT (Ships Latitude) = Manual entry of the present position of the ship or position as automatically updated by GPS input.LON ( Ships Read more:Antenna
Troubleshooting and Repair 2007-06-25 19:21:00 4 aspect to do troubleshooting and repair the "SeaTel" autotrack VSAT :Test equipment System block diagramTest pointsIsolate the problemTest equipmentTest equipment that needed :VoltmeterSpectrum analyzerOscilloscopeSystem block diagramHere are the component function in the system block diagram :ADE componentBDE componentsPower and signal flowADE componentADE component consists of :Pedestal componentsStabilization componentsRF (Radio) equipmentBDE componentsBDE Component consists of :Antenna Control UnitTX/RX Splitter, modem, Multiplexer, Computer and other ancillary equipmentTVRO splitter/matrix switch, satellite receiver/IRD, modulator, standards converter, combiner amp and other ancillary equipment.Power and signal flowPower and signal flow consists of :AC power distribution in the antennaPedestal power supplyRF signals IF signal ADE-BDEPedestal and Radio M&C signals (ADE-BDE)Distribution of IF in the BDETest pointsTest points consists of two primary section :Block Diagram - Points Read more:Troubleshooting
, Repair
Functional Testing & Commissioning 2007-06-24 21:42:00 Above deck equipmentCheck freedom of motionCheck feed alignmentCheck antenna balanceEnergize antenna and note mechanical position of reflector pointing when at home switch to calculate Home Flag OffsetBelow deck equipmentSet parameters on ACUSystem typeTracking parameters Gyro Type Home flag offsetGyro compass HeadingVessel position (automatic if GPS input is used)Internal tuner selection and tuning frequencyDesired satellite longitudeFunctional
testingCheck each function to assure proper operation :ACU Power "ON”Verify ACU/PCU communications.Ships Heading - Initial setting and subsequent updating of the heading correctly follows the ships gyro compass.LAT/LON - Verify manual entry and automatic GPS update. Internal tuner selection and frequency. Choose best tracking frequency. Never use TXIF frequency.AZ Drive - Step, slew and target AZ to verify proper drive.EL Drive - Step, slew and target EL to verify proper drive.Feed polarization - Verify that polarization of the feed is oper Read more:Testing
Remote Commands 2007-06-24 21:24:00 To Monitor Position Of The Motors, Home Flag:While at the Remote
Command window key in: . , 1 , 1 , 8 , ENTERVOOOO will appear, press ENTER again.Press MODE to go to Remote Monitor Window. Typical readout will be A/D counts of CL LV AZ (eg 2048 2050 0012). In this example 2048 = Cross Level when antenna cross level beam is level, 2050 = Level (elevation) when elevation is at 45 degress and 0012 = azimuth position readout (4079 will appear when the home flag relay is energized). The range of values that can be displayed in each of these axis is from 0000 to 4096.To Reset/Reinitialize the Antenna:While at the Remote Command window key in: . , 9 , 4 , ENTERThen key in 9 , 0 , ENTER.This resets the PCU on the antenna. The antenna will reinitialize with this command (Performs a similar function as a power reset of the antenna).Setting the PCU system model :- While at the Remote Command window key in: . , 7 , 8 , ENTER- NOOOO will appear, press O, # , # , # , ENTER the system model. 0 Read more:Commands
Dac Input Specifications 2007-07-02 02:59:00 These are RF tracking input, RS 232 monitor and control interface, NMEA interface, and external AGC input specifications :
Ready to Install 2007-07-02 01:56:00 These are the two autotrack VSAT antenna dome that will be installed on the barges. Unlike rig, barge has to use Autotrack VSAT antenna because his body is floating on the sea.The Autotrack Vsat antenna will be used onboard barges and it will have to be able to provide uninterrupted satellite usage while under a variety of motion.Here are 3 points of principle operation of our autotrack VSAT system :Pointing/Targeting = Accurately driving the antenna to a precise Azimuth and Elevation angles in three dimensional free space to be consistent with where the satellite signal is emanating from. Stabilization = Maintaining the Azimuth and Elevation pointing angles while the barge/ship is rolling, pitching and turning.Tracking = Use of the received satellite signal level to continuously evaluate and optimize the pointing angles of the antenna for maximum signal level reception.
Reference Sensor Monitoring 2007-07-04 22:05:00 To monitor the reference sensors, select the REMOTE COMMAND window on the DAC-97. key in “.118 ENTER” (note the decimal point). “v0000” should appear in the command window. Press the MODE key once more to display the REMOTE MONITPR window. The lower display will show “v” and three 4 digit decimal number.The numbers represent the Cross-Level and level Tilt Sensor
output and the Azimuth home flag respectively. The nominal display is 2048 for the Tilt sensors and either 0020 0r 4050 for the home flag.The Cross-Level Tilt display should decrease when the antenna is tilted to the left and increase when tilted to the right. The level tilt display should decrease when the antenna is tilted forward and increase when tilted back.The Home Flag display will show 4050 when the home flag magnet is away from the sensor and 0000 when the home flag magnet is under the sensor. The display changes are static and remain displaced asa long as the level platform is disturbed or the home flag se
Monitoring activity current consumption of motors 2007-07-04 22:02:00 The DAC-97 provides a means for monitoring the position error of the antenna for diagnostic purpose. If this error excessive, it indicates external forces are acting on the antenna. These forces may be the result of static imbalance, excessive bearing friction, cable binding, or wind loading.To view the position error, select the REMOTE COMMAND window on the DAC-97 by pressing the MODE key seversl times. Key in “.120 ENTER” (NOTE THE DECIMAL POINT). “X0000” should appear in the command window. Press the MODE key once more to display the REMOTE MONITOR window. The lower display will show “iv” and three 4 digit hexadecimal numbers.The numbers indicate Cross Level, Level and Azimuth errors at a resolution of 1 part in 65536 or 0.0055 degrees. For example a display like “iv FFFF 0001 FFFD” indicates the Cross Level error is -.005 degrees, the level error is +.005 degrees and the Azimuth error is -.016 degrees. The normal range of these numbers is FFF0 to 000F and they typi
DAC-97 Displays “Remote not responding” 2007-07-11 22:41:00 Either the RS422 communications link with the antenna has failed or the pedestal control unit has failed. For Conscan equipped systems observe if the disk sensor light on the Conscan PC Board is flashing. A flashing light indicates the communication from the PCU to the ACU is functioning.Verify the operation of the PCU if possible by using a handheld ASCII terminal connected to the interface cable at the pedestal multiplexer. Verify the RS422 signal levels and connections.Using a spectrum analyzer observe the 1.1 and 1.5 MHz Pedestal M&C carrier signals on the RX IF cable. Hold the DAC-97 RESET, key down and observe the 1.5 MHz signal is a steady high frequency of 1.525 MHz. Release the RESET key and the signal should occasionally be seen switching to 1.475 MHz. this indicates the base Multiplexer is transmitting to the PCU. Read more:Displays
, Remote
Open Loop Motor Test 2007-07-11 22:39:00 The DAC-97 provides a means for driving each individual torque motor to test that motors functionality.By driving each axis and observing the resulting motion of the antenna, a coarse operational status of the motor and motor driver can be established.To manually drive the motors, select the REMOTE COMMAND window on the DAC-97. key in “.94 ENTER” (note the decimal point). “^0000” should appear in the command window.To drive the Cross Level motor, key in 1064, 1128 or 1192 to drive the Cross level axis left, off and right respectively.To drive the Level motor, key in 2064, 2128 or 2192 to drive level axis forward, off or back.To drive the Azimuth motor, key in 3064, 3128 or 3192 to drive the Azimuth axis CW, off or CCW. Read more:Motor
What Is a Satellite Stabilizer? 2007-08-26 21:03:00 A satellite stabilizer allows a moving vessel (such as a boat or a semi-submersible drilling structure, to receive and send a signal to a geo-stationary satellite. The parabola sits on top of a system of motors and counter-balances that allow the parabola to swing 360° horizontally (azimuth) and 180° vertically (elevation). All of the electronics for the outdoor unit (ODU) also sit on the robotic stabilizer. Because of this, power leads and other cables cannot be run direct to the electronics; power is supplied through a series of slip-rings.Because of its large mass, the stabilizer relies on being balanced in perfect equilibrium to prevent excessive wear and tear on the positioning motors.The stabilizer, once locked onto the signal of its assigned satellite, will ensure that the antenna parabola stays positioned on that one point in the sky despite the movements of the vessel to which it is attached.The stabilizer is connected to an indoor unit (usually situated in the radio room o Read more:Satellite
Finding Satellite 2007-08-26 21:02:00 Finding a satellite's position in the sky from a fixed position is easy when you know these things:The satellite's longitude. (Because it has to be on the equator, the latitude must always be 0°).The elevation of the satellite relative to the horizon.The azimuth of the satellite relative to true north.This is fine for fixed applications, where this is a one-time job that takes a few minutes with a compass and a wrench. However, I am concerned here with providing continuous access to a satellite from a moving vessel. Here, I need to find the satellite continuously, every time the vessel moves. To do this, there are a few more things I need to know:The heading of the vessel (where is it pointing relative to true north)The latitude and longitude of the vessel (where is it on the surface of the earth)The pitch of the vessel (elevation angle relative to the bow-aft line of the vessel)The roll of the vessel (elevation angle relative to a line running port to starboard on the vessel)Th Read more:Satellite
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