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Model 1278K Mobile VSAT Antenna System

Operation and Maintenance Manual

5.5 POLARIZATION LIMITS

TracStar Systems Controller uses the polarization potentiometer voltage to determine limits. The

controller drives to 0° pol when it stows. The AvL positioner has the mechanical capability of +/-92.5

degrees per section 3.3 of the TracStar Systems Controller Manual. If the Controller Fails to terminate

power to the motor and the system is driven to a hard limit stop, the DC motor will stall. To correct, reset

the pol jam error in the controller.

5.6 FEED ASSEMBLY

The feed assembly consists of the feed, the polarization drive, and the polarization potentiometer. The

elevation inclinometer is also mounted on the inside of feed motor drive box.

The feed assembly is installed as a complete unit and secured to lower feed bracket. (Fig. 5.1) The feed

horn is mechanically positioned with a template within 1/8" of the theoretical focal point of the reflector.

This positioning assures the RF System provides the gain and FCC compliance as stated in the

specifications.

Figure 5.1

Содержание 1278K

Страница 1: ...ge Rev 0 February 2006 900 017 001 A Copyright 2006 No part of this document may be photocopied or otherwise reproduced without the prior permission in writing of AvL Technologies Inc Such written permission must also be obtained before any part of this document is stored in an electronic system of whatever nature ...

Страница 2: ...ack 11 3 6 Azimuth Stow Switch 11 SECTION 4 ELEVATION POSITIONING SYSTEM 4 1 Elevation Pivot Assembly 12 4 2 Elevation Gear Box 12 4 3 Elevation Motor 12 4 4 Elevation AvL Cable Drive 12 4 5 Elevation Position Feedback 13 4 6 Elevation Stow Switch 13 SECTION 5 POLARIZATION POSITIONING SYSTEM 5 1 General 14 5 2 Feed 14 5 3 Polarization Drive 14 5 4 Polarization Position Potentiometer 14 5 5 Polariz...

Страница 3: ...rive systems The cables are pretensioned and spring loaded at the main drum attachment point which eliminates backlash at installation and from any cable stretch in the future SECONDARY DRIVE SYSTEM The Az and El AvL cable drive systems are driven by a low backlash worm gear set with a 40 1 ratio The factory low backlash of the worm gear set is reduced further by the AvL cable drive ratio resultin...

Страница 4: ...is minimum 35 dB 35 dB Off Axis within 1 dB BW 26 dB 28 dB Off Axis peak 22 dB 25 dB Feed Port Isolation TX to Rx 75 dB Satellite System Compliance FCC and PanAmSat Worldwide Controllers Optional Upgrades Auto acquisition One button acquisition of selected satellite including peaking and optimization of cross pol certified for auto commissioning on most satellite services Size Single Rack Unit for...

Страница 5: ... with Connectors for Controller Manual Drive Handcrank on Az and El Axii Weight 115 to 125 lbs 52 to 57 kg depending on options selected Stowed Dimensions 74 L x 49 W x 17 H inches 188 L x 125 W x 43 H cm Environmental Wind Survival Deployed 65 mph 121 kmph Stowed 80 mph 161 kmph Operational 45 mph 72 kmph Pointing Loss in Wind 20 mph 32 kmph 0 5 dB Typical 30 Gusting to 45 mph 48 to 72 kmph 1 0 d...

Страница 6: ... the controller 1 Model 1278K Mobile VSAT shown in stowed position Figure 2 1 2 Connecting the coax cable first make the appropriate electrical connections Figure 2 2 3 Press on TracStar hand held controller and hold for 3 seconds until unit begins deploying Figure 2 3 shows the unit fully deployed 2 2 INSTALLATION TO VEHICLE The 1278K Mobile VSAT positioner is attached to a base plate and rail as...

Страница 7: ...tar Systems In Door Unit IDB 1 2 The display should read Ready Press the key to begin a satellite acquisition To Stow the antenna press and hold the key for 3 seconds There will be a 3 second delay before the antenna begins to stow to ensure that transmit is disabled 1 3 If at any time either during an acquisition Display reads Run while locked or during a stowing operation Display reads Stow the ...

Страница 8: ...e to move to JOG 3 Press ENTER to move the cursor to the speed item FAST or SLOW 4 Press to change from FAST to SLOW as desired 5 Press ENTER to move the cursor to the desired axis A is AZ E is elevation P is pol 6 Press START STOP button to activate the motors The jog displayed in the upper left will change to upper case 7 Press or to move the axis one unit One unit in FAST is 1 0 degrees and one...

Страница 9: ... system fails 1 From the READY screen press MAIN four times to reach the GPS screen 2 The blinking cursor will be over NORMAL 3 Press to change to MAN 4 Press ENTER to save the value 5 Press until the desired latitude is displayed 6 Press ENTER to save the value and move to the LONG item 7 Press until the desired longitude is displayed 8 Press ENTER to save the value Manual Compass Entry This can ...

Страница 10: ... shaft with a square key knurl plus permanent locktite to eliminate any backlash between the capstan and gearbox The low backlash is achieved by selective fit of the worm and worm gear The nominal backlash for the gearbox is 30 which is reduced by the AvL cable drive to less than 4 of the beam of the antenna The gearbox contains synthetic oil filled half way to the level plugs Because of the desig...

Страница 11: ...e redundancy If a cable becomes damaged during usage cut off cable and continue to use positioner Replace cable when time permits at your maintenance facility The cables are sized to last the life of the positioner No replacement from wear is expected The springs package at one end will automatically compensate for any elongation of the cable Cable position should be checked as per periodic mainte...

Страница 12: ...controlled by the TracStar Systems controller The AvL has the mechanical capability of 400º or 200º from stow position 3 6 AZIMUTH STOW SWITCH The TracStar System controller uses the az potentiometer voltage to determine limits Therefore the AvL positioner is equipped with only an azimuth stow position switch Limit switch mounting holes are provided if needed for other brand controllers The azimut...

Страница 13: ...otor armature rotates at up to 3300 rpm causing a high frequency noise that will vary depending of the loading condition of the motor Fig 4 1 An optical encoder is mounted to other end of motor output shaft to provide real time positional information to TracStar Systems controller The maximum output speed is 104 rpm The output shaft is a standard keyed shaft The output torque capacity of the motor...

Страница 14: ...nce the AvL cable drive has no backlash the position feedback is as accurate as the resolution and accuracy of the clinometer and encoder The clinometer has a resolution of 0 1 degrees with and accuracy linearity of 1 in the 0 45º range and monotonic in the 45 90º range The clinometer is rated for an outdoor environment The encoder also provides precise feedback on units position during operation ...

Страница 15: ...late in the pol drive box with a drive sprocket mating to the motor shaft which extends through the feed drive box The polarization drive motor is a 12 VDC gear motor Small gear is attached to the end of the motor shaft that drives small gear to drive the position potentiometer The controller travel limits are 95 degrees for a 2 port See TracStar Systems Controller Manual section 3 3 If the chain ...

Страница 16: ... is driven to a hard limit stop the DC motor will stall To correct reset the pol jam error in the controller 5 6 FEED ASSEMBLY The feed assembly consists of the feed the polarization drive and the polarization potentiometer The elevation inclinometer is also mounted on the inside of feed motor drive box The feed assembly is installed as a complete unit and secured to lower feed bracket Fig 5 1 The...

Страница 17: ...h az limits and observe cable tracking Check for excessive backlash in gearbox Inspect cable terminations Inspect az potentiometer ELEVATION Hand crank in elevation the unit should hand crank easily Unit should hand crank with approximately 50 75 in lbs torque Check for unusual noise in elevation pivot bearings and elevation gearbox Run in elevation and check for unusual noise in elevation motor R...

Страница 18: ...s These parts will not fail from activity but may fail from environmental exposure Description Manufacture Manufacture Part No Limit Switch Long Arm Omron D2VW 5L2 1HS Potentiometer 1k 10T ETI MW20B 2982 1K Clinometers Lucas 02111 002 000 Optional WR75 Super flex 18 Microtech MTES75 502 N 18B Elevation Motor Globe 455A888 Azimuth Motor Globe 455A889 Polarization Motor Globe 415A886 ...

Страница 19: ...Model 1278K Mobile VSAT Antenna System 19 Operation and Maintenance Manual SECTION 7 INTERFACE DRAWING ...

Страница 20: ...Model 1278K Mobile VSAT Antenna System 20 Operation and Maintenance Manual SECTION 7 INTERFACE DRAWING ...

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