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AvL Technologies 1200K, Руководство по эксплуатации и обслуживанию

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Model 1200K/1210K - RCI SNG ANTENNA SYSTEM

17

Operation and Maintenance Manual

5.4 POLARIZATION POSITION POTENIOMETER

The polarization feedback is produced by a 10 turn, 1K-ohm potentiometer driven by the worm shaft, and
mounted on the polarization motor bracket.  The resolution and accuracy is 0.3 degrees.  The 
potentiometer is rated for IP 65 environment, Wind, Rain, and dust etc... The potentiometer is
mechanically set at the one-half travel position. (5 turns from either end) and will read approximately 500
ohms at 0° pol (stow).  The potentiometer may be set using the controller the voltage reading at pol stow
will read 2.5V at 0°.  See RCI controller manual Sec. 3.3

5.5 POLARIZATION LIMITS

The RCI 3000 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° per section 3.3
of the RCI 3000/3050 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 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 feed assembly is installed as a complete unit and secured to each side of feed box.  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.  Minor RF improvement can be realized by optimizing the feed positioning 
using transmit or receive patterns.  Inclinometer is mounted on the inside of feed box.

Содержание 1200K

Страница 1: ...L Technologies P 130 Roberts Street P Asheville NC 28801 828 250 9950 P 828 250 9938 Fax P www avltech com 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: ...ok Cable Drive 10 3 5 Azimuth Position Feedback 10 3 6 Azimuth Stow and Limit Switches 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 Roto Lok Cable Drive 13 4 5 Elevation Position Feedback 13 4 6 Elevation Stow and Limit Switches 14 4 7 Elevation Stow Ignition Cut Out Switch 14 SECTION 5 Feed and Polarizatio...

Страница 3: ...ment The 8 f d optics reduces off axis cross pol in the asymmetrical plane The RF power amplifier may be installed on the feed boom positioner backing structure or inside the truck Waveguide run to power amp across each axis can be via twist flex or rotary joints The system can be configured for either 2 port or 4 port ROTO LOK DRIVE SYSTEM The patented Roto Lok drive system utilizes highly reliab...

Страница 4: ...e the best torque to weight ratio as well as allowing dual speed operation for slewing and peaking These motors produce constant torque over the speed range with no cogging at low speeds which ensures smooth operation when peaking antenna The 24V DC design provides current limiting torque control and will allow vehicle battery operation if necessary CONTROLS The system will interface with a jog co...

Страница 5: ...eploying 2 second Peaking 0 2 second Motors 24V DC Variable Speed Constant Torque RF Interface HPA Storage Feed Boom Rear of Reflector or Inside Truck Axis Transition Twist Flex or Rotary Joints Waveguide WR 75 Cover Flange at Interface Point Coax RG59 run from feed to base plus 8 ft Electrical Interface 25 ft Cable with Connectors for Controller Optional Manual Drive Hex Socket Wrench Weight 110 ...

Страница 6: ...ing Antenna Noise Temperature 30 Elevation Angle 30 K Polarization Linear Power Handling Capability 0 5KW per port Cross Pol Isolation On Axis 35 dB 35 dB Off Axis within 5 dB BW 32 dB 32 dB Off Axis within 1 dB BW 30 dB 30 dB Feed Port Isolation RX RX 30 dB TX RX 60 dB CONTROLLER Type Jog or Full Function Controller Manual Mode Input Front Panel Keypad for Jog Run Run To Stow Automatic Mode Input...

Страница 7: ...gh to prevent no more than a 0 5 dB of TX gain loss in a 30 mph gusting to 45 mph wind 850 IN LB moment 25 A 11 inch diameter hole should be in the mounting surface The mounting surface must be flat within 005 inch to prevent binding the azimuth bearing after torquing the mounting bolts No obstruction should be above the interface surface in a 17 inch diameter envelope Any other roof mounted equip...

Страница 8: ...o cure before final torquing IF INTERFACE SURFACE IS FLAT WITHIN 005 INCH apply a thin coat of silicone between azimuth ring and surface TORQUE ALL 12 BOLTS TO 9 10 FT LBS 2 3 CONTROLLER INSTALLATION Install controller into electronics rack Connect cables to rear making sure P1 and P2 are connected to correct sockets P1 to J1 and P2 to J2 Confirm controller voltage and fuse are correct if not conv...

Страница 9: ...ATED SO ANTENNA MOVEMENT MAY BE OBSERVED DURING TEST Press mode key to change screens and Select STOW Watch reflector surface approach feed horn Press STOP when reflector is within 2 of feed horn Jog down until reflector presses on rubber padding on feed housing Adjust stow limit switch if necessary by bending lever Stow switch is on east side with long lever East is the left side as viewed from b...

Страница 10: ...th capstan is secured to the output 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 Roto Lok drive to less than 4 of the beam of the antenna The gearbox contains synthetic oil filled half way to th...

Страница 11: ... correct position is obtained At installation the Belleville springs are collapsed until no air is seen between the springs You should check this condition yearly to account for the slow settling of the cable strands Use pliers to hold stud and box end wrench to tighten nut Be sure not to over tighten Tighten until springs are almost fully collapsed Fig 3 3 3 5 AZIMUTH POSITION FEEDBACK The azimut...

Страница 12: ...e stow switch the az stow position can be varied by either changing the zero position of the az potentiometer or zero voltage of the controller Rotation Direction Convention is clockwise CW viewed from above mount is counter clockwise CCW viewed from above mount NOMINAL AZIMUTH LIMITS Model Limits 1200 With 300 az and no az RJ or 145 155 with single az RJ 1200 With 270 az and With dual az RJ 120 1...

Страница 13: ...ole and square key The worm shaft is extended with a hex shape adapter for the hand crank The dual elevation capstans are driven with a square key and clamped to the gearbox shaft to eliminate backlash Fig 4 2 The gearbox contains synthetic oil filled half way to the level plugs Because of the design capacity of the gearbox low rpm and limited cycles experienced by an SNG system no maintenance is ...

Страница 14: ...y The cables are sized to last the life of the positioner The springs will automatically compensate for any elongation of the cable The position should be checked per the periodic maintenance schedule in Section 6 If the cables have drifted manually move cables using blunt instrument on elevation drums until correct position is obtained At installation the Belleville springs are collapsed until no...

Страница 15: ...rum side plates The elevation up and down switches do not require adjustment The Elevation Stow switch is adjusted by using needle nose pliers and bending the limit switch lever as needed See section 2 6 above 4 7 ELEVATION STOW IGNITION CUT OUT SWITCH A second elevation stow switch is mounted on the west elevation pivot and used as an ignition cutout switch It should be adjusted to actuate before...

Страница 16: ... screws at the rear flange of the OMT The feed polarization drive is mounted underneath pol mounting plate with worm mating to worm gear which extends through slot 5 3 POLARIZATION DRIVE The feed polarization drive is mounted underneath pol mounting plate with a worm mating to the worm gear which extends through a slot The polarization drive motor Fig 5 1 is a 12V DC gear motor It is attached to a...

Страница 17: ...voltage to determine limits The controller drives to 0 pol when it stows The AvL positioner has the mechanical capability of 92 per section 3 3 of the RCI 3000 3050 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 pol jam error in the controller 5 6 FEED ASSEMBLY The feed assembly consis...

Страница 18: ...hten springs if more than 010 gap exists between spring sets Tighten With an open end wrench and using Visegrip pliers holding stud Inspect az stow switch Inspect and confirm az potentiometer is seated properly and not damaged Check az bearing screws az gearbox bolts az pot bracket etc are tight ELEVATION Hand cranking in elevation the unit should hand crank easily Unit should hand crank with appr...

Страница 19: ... environmental exposure Description Manufacture Manufacture Part No Limit Switch Short Arm Omron D2VW 5L2A 1HS Limit Switch Long Arm Omron D2VW 5L2 1HS Potentiometer 1k 10T ETI MW20B 2982 1K Clinometers Lucas 02111 002 000 Optional AZ EL Rotary Joint Advanced Microwave AMC 206 CG CG RJ U B WR75 Super flex 18 Microtech MTES75 502 N 18B Elevation Motor Colman CYMA 82700 721 Azimuth Motor Colman CYMA...

Страница 20: ...Model 1200K 1210K RCI SNG ANTENNA SYSTEM 20 Operation and Maintenance Manual SECTION 7 INTERFACE DRAWING ...

Страница 21: ...Model 1200K 1210K RCI SNG ANTENNA SYSTEM 21 Operation and Maintenance Manual ...

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