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7.2.13

Automatic Beam Switching Protocol

The ACU can change the target satellite upon receiving the modem protocol (iDirect,

iDrtABS, VIASAT,) of the SAMYUNG ENC protocol (GTP) from the external device. This

function is the ‘Automatic Beam Switching (ABS)’. The ACU receives the ABS protocol via

the NMEA port or the Ethernet port.

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‘▲’

‘▼’

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‘▲’

‘▼’

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‘▲’

‘▼’

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Figure 7-38 ABS Protocol Configuration

Содержание Ku-BAND RX

Страница 1: ...INSTALLATION AND OPERATION MANUAL FOR VSAT VS61 Ku BAND TX RX ANTENNAS...

Страница 2: ...Reserved The information contained in this document is proprietary to SAMYUNG ENC Inc This document may not be reproduced or distributed in any form without the consent of SAMYUNG ENC Inc The informa...

Страница 3: ...istory Revision Date Description By Remark 2 0 Apr 23 2010 Initial Release PCU Ver 2 000 ACU Ver 3 400 Hong DVBS2 2 1 Mar 28 2011 Change the radome drawing and add the SCS version PCU Ver 2 110 ACU Ve...

Страница 4: ...ntenna 12 3 4 3 Installing the Radome Assembly 12 3 4 4 Installing the Cables 14 3 5 Mounting the Antenna Control Unit ACU 15 3 6 Installing the ACU Cables 17 3 6 1 ACU Connectors 17 3 6 1 1 DB 15 Gyr...

Страница 5: ...ining Algorithm 32 4 2 Searching and Tracking Reference 32 4 2 1 Searching Reference 33 4 2 1 1 DVB C N Threshold 33 4 2 1 2 DVB AGC Threshold 33 4 2 1 3 RSSD Threshold 33 4 2 1 4 DVB Carrier Lock Bit...

Страница 6: ...p s Bow 45 5 2 1 Confirming the Current Heading Offset 46 5 2 2 Determining the Heading Discrepancy 46 5 2 3 Adjusting the Heading Offset 49 6 Configuration of the STR and the DVB Tuner 50 6 1 Decidin...

Страница 7: ...nal Status Key 76 7 2 Installation Mode 78 7 2 1 Bluetooth Initialize 78 7 2 2 Ship Heading Offset 79 7 2 3 Searching Parameter Setting 79 7 2 4 Polarity Calibration 81 7 2 5 Block Area Setting 83 7 2...

Страница 8: ...ure 96 8 2 Check the Antenna s Operational Status 97 8 2 1 Antenna Status 97 8 2 2 Signal Strength 98 8 2 3 Antenna Status LED 98 8 2 4 M C using Mini USB 99 9 Troubleshooting 100 10 Error Message 107...

Страница 9: ...terms and are fully familiar with the operation of these systems Although installation may be completed by personnel preferred or designated by the customer it is also recommended that personnel be t...

Страница 10: ...led exposure limits apply to situations in which persons are exposed as a consequence of their employment and in which those persons who are exposed have been made fully aware of the potential for exp...

Страница 11: ...be manually adjusting the feed during a high rate high power transmission Also note that the power density decreases toward the reflector as the beam widens from the feed so the maximum exposure time...

Страница 12: ...g Area Near field This is the area bounded by a cylinder within the same diameter of the reflector and which extends from the reflector toward the satellite for in the case of auto acquire systems les...

Страница 13: ...personnel these sites should be considered as uncontrolled and the recommended precautions taken accordingly The primary precaution should consist in restricting access to the immediate area in front...

Страница 14: ...om the dish as the boat turns 2 The antenna is at least 5m away from other transmitting antennae HF VHF and radar which may generate signals with the potential to interfere with the VS series antenna...

Страница 15: ...7 Figure 3 1 Best Location Figure 3 2 Antenna Blockages...

Страница 16: ...ove the packaging material carefully Lift the unit out of the box carefully Do not turn the box and roll the unit out or turn the box upside down to remove it Be careful when unpacking the equipment L...

Страница 17: ...out removing the fixed parts jig screw tie the antenna may be damaged The antenna should be secured using the fixed parts during transportation by truck or another vehicle So please keep the fixed par...

Страница 18: ...ows within 20m RG6 within 50m RG11 within 100m LMR400 within 200m LMR600 NOTE Impedance of cable is 50ohm Also you can select the other cable types However we recommend all attenuation of cable is und...

Страница 19: ...ion 3 Thread the TX and RX cables from below deck up through the cable access hole on the deck Check the number of RF cables required 4 The support post should be upright Check the post angle carefull...

Страница 20: ...f torque Check label both ends of each RF cable to match its antenna base plate connector Do NOT use Teflon gel on the cable fittings as it reduces signal strength at high frequencies 3 4 3 Installing...

Страница 21: ...13 length of threaded rod that extends above the radome base should be cut off Figure 3 7 Bolting the Radome Antenna Figure 3 8 Tighten the nuts from below...

Страница 22: ...stall the Cable Grand to protect the cables Figure 3 9 Typical Cable Grand Thread the TX RX cables through the cable access holes and connect them to the connectors of the antenna Check the labels on...

Страница 23: ...d testing you have to remove the fixed jig after installing the radome assembly If you do not remove the fixed jig and then supply power to the antenna the antenna may be damaged Please recheck whethe...

Страница 24: ...e ACU should be placed in a dry location that is convenient for the user 2 It must not be susceptible to magnetic interference nor be situated on a level surface 3 It should be placed so that the LCD...

Страница 25: ...on 3 6 1 ACU Connectors This section provides detailed ACU connectors the function of connector Most ACU connectors are located on the rear of the ACU as shown in Figure 3 13 Figure 3 13 ACU Rear View...

Страница 26: ...S data via a DB 9 NMEA connector Figure 3 15 layout of the DB 9 NMEA Connector Pins 3 6 1 3 DB 9 Monitor Control M C Connector The M C connector is a DB 9 which supports RS 232 data The baudrate of th...

Страница 27: ...ply the selection signal to coax the switches in VSAT dual antenna configurations The user can select Contact Closure or DC 5V Output by SW1 and SW3 of the ACU board as shown in Figure 3 20 below SW1...

Страница 28: ...20 Figure 3 18 A Mode Contact Closure Figure 3 19 B Mode Power Output NOTE Do not use the I O gyro strip and the DB 15 gyro connector at the same time as this may damage the ACU...

Страница 29: ...lection in the ACU Board using a Jumper CAUTION There is a risk of electric shock from the gyro compass output lines Make sure that the gyro compass output is turned OFF when handling and connecting t...

Страница 30: ...he same time as this may damage the ACU 3 6 1 6 RJ 45 Console Port The RJ 45 console port provides the following Transmits GPS information and transmits Mute receives TX lock and external AGC values 0...

Страница 31: ...X IN connector supplies 48V DC power to the antenna and receives RX signals from the antenna Also the KA 160 ACU communicates with the antenna using Bluetooth via the RX IN connector The RX OUT connec...

Страница 32: ...ard configuration the cabling between the above deck equipment antenna pedestal and the below deck equipment ACU only requires TX and RX L band coaxial cables of a type that will be determined during...

Страница 33: ...operate that antenna Technically speaking the grounds from the TX and RX IFL runs can be different but a single piece of cable running from the ACU to the antenna will ensure that the antenna operate...

Страница 34: ...nnections These wires may conduct high voltages and can damage equipment and or cause personal injury For the synchro and step by step gyro inputs the installer must enter the ship s heading informati...

Страница 35: ...e input range of the synchro type gyro 3 6 3 2 Step by Step Type of Gyro Connection Use the 4 pins COM S1 S2 S3 of the DB 15 connector or the I O gyro strip connector when the ship s gyro is of the st...

Страница 36: ...3 4 RJ 45 Connection for Satellite Modem The KA 160 ACU and the satellite modem exchange some data with each other such as GPS data TX mute functions external lock state and external AGC Otherwise ple...

Страница 37: ...e ACU Signal Direction Modem 2 RX Lock Receive Send 4 GND GND GND 5 GND GND GND 6 GPS Send Receive 7 TX Mute Send Receive 8 Ext AGC Receive Send All Other Pins N A Table 3 7 Data Type and Data Flow of...

Страница 38: ...e of the GPS can be configured as GPRMC or GPGLL or GPGGA and from 1200 to 115200 bps respectively using the KA 160 ACU The DB 9 NMEA and the RJ 45 ports can each have a different format and baud rate...

Страница 39: ...ud rate of the M C Port is fixed at 57600 M C DB 9 Pin No Type 2 Receive Data 3 Send Data 5 GND All other pins NA Table 3 9 Layout of M C Port Pins 3 6 3 7 Ethernet Port Both installer and operator ca...

Страница 40: ...sets of algorithms specific to land mobile and maritime applications The SAMYUNG ENC stabilizer uses a single algorithm for land mobile and maritime applications simply because the motion sampling pr...

Страница 41: ...ted to ensure the success of the searching process 4 2 1 3 RSSD Threshold The antenna searches for the satellite using an RSSD threshold level RSSD measures a power spectrum of about 50 KHz at its tun...

Страница 42: ...ing lock and setting lock on must be as fast as the speed of the VS61 searching process To keep the response times to a minimum it is necessary to use a lower value for the acquisition range no higher...

Страница 43: ...antenna tracks the satellite by dish scan by reading the RSSD power level of 100 KHz of the desired carrier for the target satellite Usually the RSSD frequency is the L band frequency of the target c...

Страница 44: ...he EL and AZ values are entered manually in lieu of being automatically calculated by the ACU The antenna first points the manually entered EL and AZ values and then performs the search to locate the...

Страница 45: ...satellite This method is strongly recommended in such cases To use this method the user must select the reference satellite which is certain to search and track the carrier The reference searching pr...

Страница 46: ...38 Figure 4 1 Step 1 of Reference Searching Definition...

Страница 47: ...tracking of carrier But Auto mode spends more time to search the carrier So we recommend the other methods like DVB S1 or DVB S2 DSS 4 4 2 DVB S1 In this searching standard method PCU will search the...

Страница 48: ...bility First the installer should determine whether 1 The RF downlink frequency is within the 2 LNB input frequency If not the DVB or RSSD tuner cannot be locked on the carrier 2 If the searching refe...

Страница 49: ...t the desired carrier frequency is within the operating range of the BUC Most BUCs require a 10 MHz external reference and a DC voltage from the modem or the ACU However if a BUC is activated with an...

Страница 50: ...s operation 5 1 Supply AC Power During the initial power up sequence the ACU provides DC current 48 VDC via the receive RX L band cable The ACU has a built in short circuit protection to ensure that...

Страница 51: ...s gyro is of the NMEA or Sync 1 1 type the ACU operates normally In other cases the user has to input the ship s current heading angle into the ACU or else the ACU will not operate 5 1 2 Bluetooth Co...

Страница 52: ...paired in a factory but the user must re pair the Bluetooth if the Bluetooth module is changed Refer to Figure 5 3 below Figure 5 3 Bluetooth Pairing Step NOTE You can see the Bluetooth systems aroun...

Страница 53: ...the ship s bow and the antenna s pointing position l POL Polarity Skew angle l AGC Energy level as tracking reference DVB AGC or DVB C N or RSSD l HDG Heading angle of the ship s gyro Satellite Number...

Страница 54: ...ine the PCU compass mode NOTE Heading offset only affects the azimuth angle and has nothing to do with elevation 5 2 1 Confirming the Current Heading Offset You can see the current heading offset in t...

Страница 55: ...he direction of the heading offset is as shown in Figure 5 8 If you want the antenna to move counter clockwise you have to input a positive value CAUTION The heading offset must be correct for quick a...

Страница 56: ...48 D i s h Figure 5 7 Determining the Heading Discrepancy Ship s BOW Figure 5 8 Direction of the Heading Offset...

Страница 57: ...f the heading offset Figure 5 9 Heading Offset adjusting Steps NOTE Save the changed parameters in Installer Mode after adjusting the heading offset Otherwise the antenna will remember only the preset...

Страница 58: ...hich the antenna determines whether it is pointing to the correct satellite or not Please refer to 4 2 Searching Tracking Reference for a detailed explanation of its operation Lock bit searching is pr...

Страница 59: ...er or if the RSSD tuner is broken The DVB tuner can correctly detect the desired carrier better than the DVB AGC threshold because the noise level increases with the energy level when there is interfe...

Страница 60: ...re interference from an adjacent satellite ASI or a local radar microwave etc Table 6 2 Preference of tracking reference 6 2 Example of Using the DVB carrier The DVB carrier is the most recommended me...

Страница 61: ...e FEC from the selected DVB carrier TP Freq RF RX Frequency MHz H V Polarity of Carrier Horizontal Vertical System Encryption System encryption type DVBS1 DVBS2 DSS SR Symbol Rate the symbol rate unit...

Страница 62: ...Desired satellite parameters DVB Satellite Astra 3A Satellite Longitude 23 5 E Frequency TP 12 605MHz Polarity Horizontal Down link System encryption DVB S2 Symbol Rate 27500KHz NOTE FEC rate isn t r...

Страница 63: ...F D ETAI LS 61 SAT0 SKEWO FFSET 0000D EG C O N FI G S T R EF D ETAI LS 61 SAT0 U PLO AD TO R U N N I N G C O N FI G YES C O N FI G S T R EF D ETAI LS 61 SAT0 U PLO AD I N G C O N FI G S T R EF D ETAI...

Страница 64: ...at is known as cross pol wherein RX polarity and TX polarity are crossed If the RX polarity is Horizontal then the TX polarity is Vertical However some satellites have what is known as co pol We suppl...

Страница 65: ...57 Figure 6 3 Co pol Kits Optional...

Страница 66: ...00 10 95 11 70 950 1700 10 25 11 20 11 70 950 1450 10 75 11 70 12 20 950 1450 11 30 12 25 12 75 950 1450 Table 6 3 Operating Range by LNBs Local Frequencies NOTE We provide a universal LNB that can co...

Страница 67: ...e parameters Satellite Galaxy 18 Satellite Longitude 123 W Frequency TP 12 140MHz Polarity Horizontal Down link System encryption NTSC Symbol Rate NOTE If your desired desire satellite does not suppor...

Страница 68: ...S T R EF D ETAI LS 61 SAT0 SKEWO FFSET 0000D EG C O N FI G S T R EF D ETAI LS 61 SAT0 U PLO AD TO R U N N I N G C O N FI G YES C O N FI G S T R EF D ETAI LS 61 SAT0 U PLO AD I N G C O N FI G S T R EF...

Страница 69: ...FR EQ 12140000KH z C O N FI G D VB TU N ER 61 SAT0 SYM BO L R ATE 00000KH z C O N FI G D VB TU N ER 61 SAT0 LN B I N FO 18V LO W LO FR EQ 10750M H z C O N FI G D VB TU N ER 61 SAT0 SI G N AL SEAR C H...

Страница 70: ...section will describe the configuration of the ACU 7 1 1 Key Mapping The following table provides a quick reference source on Key Mapping of the ACU Key Main Status Action 1 CONFIG SHIP LOCATION 2 CO...

Страница 71: ...LAT data of the antenna when the GPS is operating normally Also if the internal GPS is broken and an external GPS is not being used the operator can enter the GPS data using the ACU Refer to Figures...

Страница 72: ...ange North or South when setting the latitude and press the key to change East or West when setting the longitude 7 1 3 Ship Heading Key 2 Press key 2 to access SHIP HEADING The correct ship heading i...

Страница 73: ...ect auto searching you will see Figure 7 6 shown below Figure 7 6 Auto Searching Manual Searching If you select auto searching you will have to input the desired position elevation and azimuth angles...

Страница 74: ...ing NOTE The antenna will start tracking towards the desired position after inputting the elevation and azimuth values You must press ENT after inputting the elevation and azimuth values otherwise the...

Страница 75: ...PCU calculates the skew angle based on the polarity of the satellite and antenna s current position The skew moves to the calculated angle when selecting the AUTO mode The skew angle ranges from 95 to...

Страница 76: ...68 when the key is pressed If you want to stop the skew pull out the key Figure 7 11 Skew in Jog Mode...

Страница 77: ...N FI G S T R EF D ETAI LS 61 KO R 3 SKEWO FFSET 0000D EG C O N FI G S T R EF D ETAI LS 61 KO R 3 U PLO AD TO R U N N I N G C O N FI G YES C O N FI G S T R EF D ETAI LS 61 KO R 3 U PLO AD I N G C O N F...

Страница 78: ...atellites the operator must input the skew offset in the configuration given under S T Reference Details Go to Polarity Key 4 and search for the polarity angle where the energy level DVB C N AVB AGC R...

Страница 79: ...R 3 LN B H I G H LO FR EQ 11750M H z C O N FI G D VB TU N ER 61 KO R 3 R X R F FR EQ 11747000KH z C O N FI G D VB TU N ER 61 KO R 3 SYM BO L R ATE 21300KH z C O N FI G D VB TU N ER 61 KO R 3 LN B I N...

Страница 80: ...best one The operator can see simultaneous readings of all the S T references and select any one of the pre configured S T references as an active reference so that it can be used in the searching and...

Страница 81: ...igure 7 16 Yaw Axis Initialize Configuration 7 1 10 Searching ON OFF Key Searching OFF is a special function to prevent the antenna from going into the searching process when a searching problem occur...

Страница 82: ...Tracking ON OFF Key Under certain test environments the operator can turn off the tracking process When the tracking is turned off the antenna ceases its conical scanning and points towards the curren...

Страница 83: ...red records of the STR i e 01 SMX5 Satmex 5 and 02 NSS7 NSS7 If the antenna is using STR 01 SMX5 and the operator selects 02 IA07 then the antenna will search and track the NSS 7 satellite as per the...

Страница 84: ...If this function is entered the operator can check the status of the signal the NID of the signal and the automatic beam switching mode a Status of signal Figure 7 21 Status of Signal b Network ID In...

Страница 85: ...ID on an LCD Figure 7 22 NID c Automatic beam switching mode The operator can check the automatic beam switching mode as shown in Figure 7 23 below If the automatic beam switching mode is off the ACU...

Страница 86: ...s when you change any parameter to the desired parameter If the new parameters are not saved they will be lost the next time the ACU is power cycled and the previous parameters will be restored 7 2 1...

Страница 87: ...3 Searching Parameter Setting The searching parameter is a range which the antenna searches for the satellite from the position derived from PCU If it is too narrow the antenna will not be able to sea...

Страница 88: ...80 signal level drops below the threshold level or the antenna loses of the lock bit Figure 7 26 Searching Range Figure 7 27 Configuration of Searching Parameter...

Страница 89: ...ment The skew block must be zeroed by setting this configuration when replacing the skew block or the PCU The skew zero position is as shown in Figure 7 28 below The top side of the skew plate runs pa...

Страница 90: ...82 Figure 7 29 Skew Zero Setting Use Scale factor setting to optimize the skew angle when it is at 90 or 90 degrees Figure 7 30 Skew Scale Factor Setting...

Страница 91: ...up to three blocking areas in the ACU flash memory from which the ACU can determine whether the antenna is within a block area or not and send a contact closure CC signal via the SW1 and SW2 position...

Страница 92: ...SYNC and STEP gyros require a direction setting which provides two choices Normal and Reverse NOTE The SYNC gyro also requires a frequency setting which provides two choices 50 60Hz and 400 500Hz When...

Страница 93: ...lizing after selection of the PCU compass mode a NORMAL GYRO COMPASS Select the NORMAL mode when using the ship s gyro The ACU provides GYRO info to the PCU which the PCU uses for its computation For...

Страница 94: ...de is useful when testing the antenna on the ground without an external gyro signal However this mode is not recommended in cases where any of the ship s material consists of a magnetic metal as this...

Страница 95: ...ed in the center after the adjustment LEVEL OFFSET ANGLE Adjust this value by using the up and down keys or by typing the value until the level axis of the tilt sensor box has leveled Press Key ENT to...

Страница 96: ...or applications using less than 6W BUC most standard L band modems can provide DC power internally 24V DC The operator can control the TX DC voltage using the TX POWER MUTE function If you select ENAB...

Страница 97: ...repancy between the calculated azimuth angle and the current azimuth angle Then the PCU changes the heading offset to the new heading offset Discrepancy of Azimuth Angle Calculated Azimuth Angle by PC...

Страница 98: ...rs using SAVE NEW PARAMETER 7 2 12 Diagnostic for Sensor and Driver The operator can check the operating state of the antenna using Diagnostic for Sensor and Driver The operator can see the following...

Страница 99: ...91 SEN VEL Angular Velocity of Elevation Cross Azimuth Axis Figure 7 37 Diagnostic for Sensor and Driver...

Страница 100: ...ite upon receiving the modem protocol iDirect iDrtABS VIASAT of the SAMYUNG ENC protocol GTP from the external device This function is the Automatic Beam Switching ABS The ACU receives the ABS protoco...

Страница 101: ...te modem If this lock signal is DC voltage the ACU considers 2 6 5VDC as logical high and anything less than 2 6VDC as logical low The lock signal varies according to the manufacturer Logical high is...

Страница 102: ...rom outer devices using the Ethernet You must configure the host IP address gateway and subnet mask to use the Ethernet We provide remote access software SCS V1 7 2 TMonitor to the dealer If you want...

Страница 103: ...me the ACU is power cycled and the previous parameters will be restored Figure 7 41 Saving Steps 7 2 17 Reset Parameters If the operator wants to reset the satellite name enter RESET PARAMETERS and se...

Страница 104: ...tch on the front panel of the ACU 2 The ACU supplies power 48VDC to the antenna via the RX cable 3 The ACU initializes 4 Bluetooth of the ACU searches the Bluetooth of the PCU A software version of th...

Страница 105: ...xis of the antenna rotates to search for the magnet The antenna stops the rotation when the hall sensor meets the magnet NOTE We named the 5th 6th steps antenna initializing 7th The antenna will start...

Страница 106: ...shown below in Figure 8 2 This signal strength is changeable by tracking reference If you select the DVB AGC you can see the DVB AGC level But the AGC character remains unchanged Figure 8 2 Signal Str...

Страница 107: ...a has an error Please refer to error index Table 8 2 Meaning of Status LED Figure 8 3 Status LED 8 2 4 M C using Mini USB The operator can connect the PC with the ACU using the mini UBS port on the fr...

Страница 108: ...connected between the ACU and the AC connector 2 Check the output power 48VDC of the RX power supply 3 Check the power line of the ACU board Symptom 2 The ACU LCD blinks continuously when the ACU pow...

Страница 109: ...is not resolved re connect the power cable of the PCU And remove the cable between the PCU motor driver Re input the power to the ACU 8 If the problem is not resolved re connect the cable between the...

Страница 110: ...is not resolved replace the motor driver Symptom 6 The sensor cage directly rotates clockwise before hitting the limit switch Check Point 1 Make sure that the cable between the sensor board and the PC...

Страница 111: ...roblem is not resolved you must check the cable between the motor driver and the PCU 4 Lastly check the motor driver connector of the PCU Symptom 9 The azimuth axis does not move after the sensor cage...

Страница 112: ...urs immediately after initializing Check Point 1 Check the longitude of the target satellite If the calculated elevation angle and azimuth angle are out of its range the ACU will be displaying the sea...

Страница 113: ...eck Point 1 Please confirm that the target satellite of the ACU and the target satellite of the modem are the same 2 Check the state of the GPS data Is the GPS LED on 3 Check the cable connection betw...

Страница 114: ...k for blockage of the antenna 3 Confirm what the antenna is tracking the side lobe Then re try the search for the satellite using the button Symptom 20 The antenna cannot save the changed parameters C...

Страница 115: ...binary to use the Appendix A Error code define Error Code Error Index 0x 01 00 00 00 Level Axis Control Error 0x 02 00 00 00 Cross Level Axis Control Error 0x 04 00 00 00 Yaw Axis Control Error 0x 08...

Страница 116: ...has occurred This could indicate that the tuner is not working properly 0x 20 00 00 07 The LNB polarity voltage is not within the LNB polarity range This could indicate that the LNB voltage is not swi...

Страница 117: ...BS tuner error 17 Cage limit switch error during initialization 18 Not used 0x FF 2 18171615 14131211b 11 Axis driving error exceeds 0 5 deg for FCC 12 Yaw encoder variation too small or not operation...

Страница 118: ...is for programming the transponder satellite data 0x06 A tuner I2C bus failure has occurred This could indicate that the tuner has gone bad 0x07 The LNB polarity voltage is not within the LNB polarity...

Страница 119: ...on Operating Platform 3 Axis LNB Linear Internal PLL Skew Control Automatic 130 130 Elevation Angle 10 100 Azimuth Range Unlimited Cross Angle 35 Tracking Speed More than 90 sec Vibration Damper Rubbe...

Страница 120: ...d Appendix C Layout of Radome and Antenna Mounting Holes Figure C 1 Plastic Radome...

Страница 121: ...e Figure C 2 FRP Radome Option...

Страница 122: ...f...

Страница 123: ...g Maritime Satellite Antenna...

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