EP1049194A2 - Dispositif rotative pour antenne de réception par satellite - Google Patents

Dispositif rotative pour antenne de réception par satellite Download PDF

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Publication number
EP1049194A2
EP1049194A2 EP00201516A EP00201516A EP1049194A2 EP 1049194 A2 EP1049194 A2 EP 1049194A2 EP 00201516 A EP00201516 A EP 00201516A EP 00201516 A EP00201516 A EP 00201516A EP 1049194 A2 EP1049194 A2 EP 1049194A2
Authority
EP
European Patent Office
Prior art keywords
rotor device
rotor
dish antenna
rotations
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00201516A
Other languages
German (de)
English (en)
Other versions
EP1049194A3 (fr
Inventor
Giorgio Bergamini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Satalite Dishes Ltd
Original Assignee
Satalite Dishes Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Satalite Dishes Ltd filed Critical Satalite Dishes Ltd
Publication of EP1049194A2 publication Critical patent/EP1049194A2/fr
Publication of EP1049194A3 publication Critical patent/EP1049194A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/005—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using remotely controlled antenna positioning or scanning
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/125—Means for positioning

Definitions

  • the present invention relates to a polar rotor device for a satellite reception assembly.
  • this invention relates to a rotor device apt to drive eastward and westward rotations of a dish antenna of such assembly, comprising a motor, a transmission system, interposed between said motor and the dish antenna to transform the output motion of said motor into said eastward and westward rotations of the dish antenna, wherein said rotations comprise descending rotations, during which the dish antenna is rotated downward, and ascending rotations, during which the dish antenna is rotated upward.
  • Geostationary satellites hover according to a circumferential path concentric with the imaginary circle corresponding to the Equator. Therefore, whenever a person is in the northern hemisphere of the Earth, all the "visible" geostationary satellites can be traced by an arc described from east to west across the sky, with the apex thereof exactly oriented to the south of the person (north in the southern hemisphere). Of course, the farther away the person is from the Equator, the lower in the sky this geo-arc appears.
  • a satellite reception assembly comprises a dish antenna for capturing such signals, to be arranged outside the house, electrically connected to a receiver device for de-codifying such signals, to be placed inside the house.
  • the dish antenna generally includes a so-called satellite dish of a paraboloid shape and a "horn" fixed with it, usually indicated as LNB ("Low Noise Block").
  • the antenna dish is rotated by a rotor device, located at the dish antenna mount.
  • This rotor device comprises at least a motor, generally of a DC type, and a transmission system, apt to transform the output motion of the motor into a final rotation of the dish antenna.
  • the above optimal path of the dish antenna is obtained by mounting the rotor device so that an output antenna mounting pin thereof, i.e. the output axis of rotation, is inclined with respect to a vertical line. It will be understood that the required inclination depends upon the latitude of the geographic site where the satellite reception assembly is installed. In particular, such inclination should be greater at the lower latitudes (i.e. towards the Equator) and lower at the higher latitudes (i.e. towards the Poles).
  • Rotor devices apt to be mounted with their output pin axis of rotation inclined are generally denoted as polar, or horizon-to-horizon, rotors.
  • the inclination of the rotation axis entails that the westward and eastward rotations of the dish antenna comprise descending and ascending rotations.
  • the dish antenna is moved downward, i.e. in the same direction of the gravity force, while during the ascending rotations the dish antenna is moved upward, i.e. in a direction opposite to the gravity force.
  • DISEqC® Digital Satellite Equipment Control
  • the power supply to the rotor device is provided by the receiver.
  • current standards entail that a receiver can supply a total output current of 500 mA, at a voltage of 13 or 18 V. Of such 500 mA, about 150 to 200 mA are necessary to feed the LNB, and the remaining 300 to 350 mA are available for the rotor device.
  • the DISEqC® protocol and especially its later version known as DISEqC 1.2®, possesses a great potential for simplifying the operation of a satellite reception assembly. Furthermore, it allows such assembly to be much less cumbersome than previous systems, which used separate controllers and power supplies for the LNB and the rotor device.
  • the main disadvantage is that the output current provided by the receiver is generally not sufficient to feed both the LNB and the rotor device, especially at the higher latitudes, for dishes of larger diameter, i.e. weight, and during the ascending rotations of the dish antenna.
  • This entails a limitation in the allowed westward/eastward angular displacement of the dish antenna, and therefore in the number of satellites "reachable" for a user.
  • this problem prevents the full exploitation of the potential of the DISEqC® protocol.
  • the technical problem underlying the present invention is that of providing a rotor device allowing to overcome the drawbacks mentioned with reference to the known art.
  • a polar rotor device for a satellite reception assembly apt to drive eastward and westward rotations of a dish antenna of such assembly, comprising a motor, a transmission system, interposed between said motor and the dish antenna to transform the output motion of said motor into said eastward and westward rotations of the dish antenna, wherein said rotations comprise descending rotations, during which the dish antenna is rotated downward, and ascending rotations, during which the dish antenna is rotated upward, characterised in that it comprises elastic means, arranged at said transmission system, apt to store elastic energy during said descending rotations, and to return elastic energy during said ascending rotations.
  • the present invention provides some relevant advantages.
  • the main advantage lies in the fact that the aforementioned elastic means regulate the rotor current consumption during the eastward/westward rotations of the dish antenna, thus enabling rotor feeding directly by the receiver.
  • the elastic means decrease the power supply required by the rotor device during the ascending rotations.
  • a polar rotor device globally indicated as 1, comprises a motor 2, a transmission system, globally indicated as 3, and elastic means 4 arranged at the transmission system 3.
  • a rotor housing composed of a shaped top shell element 11 and a shaped bottom shell element 12, fixed one with the other by conventional connection means.
  • the top shell element 11 has a circular flange 111 projecting outwardly, for coupling the rotor device 1 with an antenna mounting pole 5 that will be described in greater detail later on. In proximity of the lower edge of this circular flange 111, the top shell element 11 has an angular graduation 112 engraved on its surface.
  • the top shell 11 also comprises intermediate stop walls for the elastic means 4, the role of which will be clarified later on.
  • the top shell element 11 further comprises two bolt seats 113 projecting upwardly, arranged at its opposite sides. Each of these seats is apt to receive a rotor fixed-bolt for connecting the rotor device 1 with a stationary pole, as it will be detailed later on with reference to Figure 4. In Figure 1, only one of these rotor fixed-bolt seats is visible.
  • the rotor device 1 also has two bolt seats 121 projecting rearward formed on the bottom shell 12, each apt to receive a rotor adjustment bolt.
  • the bottom shell 12 also comprises a first intermediate wall 122 integral with it and a slot 123 formed nearby. These intermediate wall 122 and slot 123 define a seat for a main printed circuit 101 that will be described later on.
  • the motor 2 is bi-directional, and it is preferably a brushless DC motor. According to the present preferred embodiment, the motor 2 is a ratio-motor or gear-motor, thus incorporating a gearbox 23.
  • motor 2 is equipped with an outer magnetic shield 21, so as to avoid electromagnetic interference with signals to and from a dish antenna.
  • Motor 2 also includes three internal capacitors (not shown in the figures), which act as a noise filter.
  • motor 2 further has an encoder 22, the function of which will be clarified later on.
  • Motor 2 is controlled by a motor control system, implemented by a main printed circuit 101 and a secondary printed circuit 104, which are represented schematically in Figure 1.
  • This control system can incorporate means for memorising the "co-ordinates" of a certain number of satellites with respect to the location of the rotor device 1.
  • the main printed circuit 101 is connected by a flat cable 103 to the secondary printed circuit 104, in its turn in direct electric connection with motor 2.
  • the main printed circuit 101 incorporates a microprocessor 102, thus being programmable.
  • the main printed circuit 101 also has a receiver connector 105, for connection with a receiver of a satellite reception assembly, and an antenna connector 106, for connection with a dish antenna of said satellite reception assembly.
  • the motor control system implements the DISEqC 1.2® protocol.
  • the rotor device 1 is apt to be driven by a DISEqC®-compatible satellite receiver.
  • This protocol will be already well-known for a person skilled in the art, thus no further description of it will be herein provided.
  • the transmission system 3 comprises the aforementioned gearbox 23, coupled to a wormscrew 31.
  • an output gear 231 of the gearbox 23 engages a wormscrew gear 32 fixed with the wormscrew 31.
  • the wormscrew 31 has a threaded profile 311 for a length indicated by a quote 312 in Figure 2.
  • the wormscrew 31 is kept in place on the one side by the engagement between the wormscrew gear 32 and the output gear 231, and on the other side by a clamp element 33 which blocks it with the top shell element 11.
  • the wormscrew 31 engages a shaped gear wheel 34.
  • the output motion of the motor 2 is transformed by the transmission system 3, comprising the gearbox 23, the wormscrew gear 32, the wormscrew 31 and the gear wheel 34, into a final rotary motion about the rotation axis 35 of the gear wheel 34.
  • This rotation axis 35 will be from now on referred to as the rotor axis.
  • all the gears of the transmission system 3 are double thick gears.
  • Figure 2 relates to an internal view of the rotor device 1, taken above from down, wherein all the components obstructing the view of the gear wheel 34 are not shown.
  • the gear wheel 34 comprises a portion of greater diameter, having a toothed profile 341, and a portion of smaller diameter.
  • the toothed profile 341 covers an angle ⁇ of the gear wheel perimetral surface In the present example, this angle is about 240 degrees.
  • the aforementioned length 312 of the threaded profile 311 of the wormscrew 31 and the angle ⁇ are chosen jointly, so as to implement a mechanical stop for the eastward and westward rotation of the gear wheel 34, as will be illustrated in greater detail later on.
  • two radial abutting edges are formed, at opposite sides of the gear wheel 34.
  • these opposite sides will be from now on regarded as a west side and an east side. Consequently, the above abutting edges will be indicated as a west abutting edge 342 and an east abutting edge 343.
  • the gear wheel 34 incorporates a plurality of magnets, arranged according to an arc. Going from the west abutting edge 342 towards the east abutting edge 343, these magnets will be denoted as a zero magnet 91, a first rotation magnet 92, a second rotation magnet 93, a west stop magnet 94 and an east stop magnet 95. The first four of these magnets are at substantially the same distance one from another.
  • the gear wheel 34 also has a central shaped mounting hole (not visible in the Figures), for example in the form of a "D", for connection with the aforementioned antenna mounting pole 5.
  • This antenna mounting pole 5 has a main body 51 projecting outside the top shell element 11 of the rotor housing.
  • This main body 51 is of a substantially cylindrical shape, having a longitudinal axis indicated with the numeral 52. At the external longitudinal end thereof, the main body 51 has a closure cap 53. At the other longitudinal end, the main body 51 is coupled to the gear wheel 34 by a coupling pin 54 integral with it.
  • the coupling pin 54 has a smaller cross section than the main body 51. Its longitudinal axis substantially coincide with the rotor axis 35, and it is more inclined with respect to the vertical than the main body longitudinal axis 52, forming with the latter an angle ⁇ . This angle ⁇ is needed for assuring an optimal mounting of a dish antenna onto the antenna mounting pole 5, as it will be explained more in detail later on.
  • the coupling pin 54 comprises a first shaped portion (not visible in the Figures), matching the central shaped hole of the gear wheel 34.
  • the coupling pin 54 further has a threaded end portion 541, apt to be screw connected with a threaded locking ring 6 adjacent to the gear wheel 34.
  • This threaded locking ring 6 has substantially circular cross sections. In particular, it comprises a base disc 61 of greater diameter and an upper disc 62 of smaller diameter.
  • the locking ring 6 also has a central threaded seat 63, passing from side to side thereof, for receiving the threaded end portion 541 of the coupling pin 54.
  • the locking ring 6 further has two mounting holes 64 for a mounting key.
  • the coupling pin 54 is inserted through the circular flange 111 of the top shell 11, through the central mounting hole of the gear wheel 34 and it is screwed in the central threaded seat 63 of the locking ring 6, in this order.
  • the pin insertion in the circular flange 111 takes place by interposition of two groups of thrust bearings 7, separated by a ring spacer 8.
  • the elastic means 4 are located at the connection between the antenna mounting pole 5 and the gear wheel 34.
  • these elastic means 4 comprise a helical torsion spring, it too denoted as 4, wounded around the upper disc 62 of the locking ring 6.
  • the helical spring 4 has two abutment arms, and specifically a first and a second side arm 41 and 42, respectively, each projecting from a respective lower or upper turn of the spring 4 according to a tangential direction. These side arms 41 and 42 are separated by an angular distance of approximately 90 degrees. Each of them has an end leg curved upwardly, 411 or 421 respectively, substantially orthogonal to the respective tangential portion.
  • the rotor device 1 further comprises a plurality of relays, and specifically a west stop relay 107, a zero relay 108 and an east stop relay 109. These relays are fixed with the top shell 11, and arranged above the gear wheel 34. In particular, the west stop relay 107 and the zero relay 108 are arranged in proximity of the west stop wall 114, at substantially the same distance between two of the magnets of the west side.
  • the east stop relay 109 instead, is arranged on the east side, in proximity of the east stop wall 115, in a symmetrical position with respect to the west stop relay 107.
  • the zero relay 108 and the east stop relay 109 have an adjustment screw each, indicated as 180 and 190, respectively, which is preferably a socket head screw.
  • relays are preferably reed relays.
  • Figure 4 shows a satellite reception assembly, globally indicated with 100, comprising the rotor device 1, a receiver 200 and a dish antenna 300.
  • the receiver 200 is supposed to be DISEqC 1.2® compatible, and therefore able to memorise a certain number of satellites and to command the rotor device 1 accordingly.
  • the receiver 200 may provide multiple functions, such as an auto-focus for the fine-tuning of the dish antenna orientation with respect to a certain satellite.
  • the receiver 200 is electrically connected to the rotor device 1 by a coaxial cable 201 running from the receiver 200 to the receiver connector 105. Signals form the receiver 200 are generally modulated at 22 kHz.
  • the dish antenna 300 comprises a satellite dish 301 and a LNB 302. The latter is electrically connected to the rotor device 1 by the same coaxial cable 201 running from the LNB connector 106.
  • the rotor device 1 is mounted on a stationary pole 400 by stationary brackets 501 attached to a stationary flange 502.
  • the stationary flange 502 has two flange fixed-bolt seats 503, each of which receives a rotor fixed-bolt 601, and two flange slots 504, each of which receives a rotor adjustment-bolt 602.
  • each rotor fixed-bolt 601 is also received in a respective rotor fixed-bolt seat 113
  • each rotor adjustment-bolt 602 is also received in a respective rotor adjustment-bolt seat 121.
  • Flange slots 504 allow regulating the inclination of the rotor axis 35 according to the latitude of the site where the satellite reception assembly 100 is installed.
  • the dish antenna 300 is fixed to the antenna mounting pole 5 by a mounting system similar to the one already described for the rotor device 1.
  • antenna brackets 701 attached to an antenna flange 702 are provided.
  • an antenna adjustment-bolt 801 sliding inside an antenna flange slot 703 allows regulating the so-called elevation of the dish antenna 300 according to the latitude.
  • the antenna brackets 701 work better if associated with a substantially vertical pole. This is the main reason for having an antenna mounting pole 5 less inclined with respect to the vertical line than the rotor axis 35. Furthermore, this more vertical mounting prevents mechanical interference between the antenna mounting pole 5 and the stationary pole 400.
  • the dish antenna 300 must be manually and/or automatically oriented towards the true south (north in the southern hemisphere), i.e. towards the apex of the geo-arc mentioned with reference to the known art. This can be done using a compass or a reference satellite. To this initial orientation of the dish antenna 300 corresponds the "zero" rotation of the gear wheel 34 shown in Figure 2.
  • the receiver command is de-codified, i.e. the angular displacement to be imparted to the gear wheel 34 in order to bring the dish antenna 300 into the required westward or eastward orientation is calculated. This calculation is made taking into account the current orientation of the dish antenna 300. Information about such current orientation is supplied by the aforedescribed angular position sensing system associated with the gear wheel 34, according to a sensing method which will be illustrated briefly afterward, and by the encoder 22.
  • the microprocessor 102 sends to the motor 2, by the flat cable 103 and the secondary integrated circuit 104, an appropriate command. Therefore, the motor 2, by the transmission system 3, rotates the antenna mounting pole 5 of the required amount. During this rotation, the angular position sensing system and the encoder 22 send to the motor control system feedback signals about the actual angular position of the dish antenna 300.
  • Signals captured by the chosen satellite are transmitted from the LNB to the antenna connector 106, and from there to the receiver 200, by the coaxial cable 201.
  • the gear wheel 34 when the rotor device 1 is in its rest configuration, the dish antenna 300 is oriented toward the true south (north), the gear wheel 34 has zero rotation and the spring 4 is in its rest condition.
  • the gear wheel 34 is rotated eastward, as in Figure 3.
  • This gear wheel rotation corresponds to a descending rotation of the dish antenna 300.
  • the second spring arm 42 moves with the gear wheel 34 by virtue of the abutment of its second leg 421 against the east abutting edge 343.
  • the first arm 41 instead, remains in abutment against the west stop wall 114. In this way, the spring 4 is torsionally deformed, thus storing elastic energy, i.e. the spring 4 is "charged".
  • the gear wheel 34 is rotated in the opposite sense, i.e. westward, for selecting a different satellite.
  • This subsequent westward rotation of the gear wheel 34 corresponds of an ascending rotation of the dish antenna 300.
  • the spring 4 returns part of the elastic energy stored in the previous descending rotation, thus reducing the driving torque that the motor 2 has to supply, and, therefore, its current absorption from the receiver 200.
  • the spring 4 allows a more regular current consumption from the receiver 200 with respect to the rotors of the known art.
  • the elastic energy stored by the spring in a descending rotation depends upon the spring own elastic properties, i.e. upon its material and diameter, upon the dish antenna weight, upon the inclination of the rotor axis and upon the instantaneous orientation of the dish antenna. As already mentioned, the latter two factors determine the magnitude of the gravity force moment about the rotor axis.
  • the elastic properties of the spring should be chosen as a compromise between the force required to charge it and the elastic force returned, by taking into account the latitude of the site where the assembly is to be installed and the angular distance between the western and eastern satellite that are to be reached.
  • Figures 6A refer to experimental trials carried out with a known art rotor device.
  • Graphics show rotor current consumption vs. angular displacement of a satellite dish having a diameter of 80 mm. Rotation of the satellite dish starts from an eastern angular position of 60 degrees and ends at a 60 degrees western angular position.
  • Continuos lines refer to the rotor axis inclination corresponding to latitude 70 degrees, dotted lines to latitude 45 degrees and bold dashed lines to latitude 15 degrees.
  • Two sets of graphics are shown, one referring to a voltage supply of 18 V, and the other to a voltage supply of 13V.
  • Figures 6B and 6C refer to the same type of graphics of Figure 6A, relating to a rotor device according to the present invention comprising a 3.8 mm diameter helical spring and a 4 mm diameter helical spring, respectively.
  • Figures 7A to 7C refers to the same type of experimental graphics reported in the corresponding Figures 6A to 6C, except for the fact that the satellite dish considered has a diameter of 100 mm.
  • the rotor device of the present invention allows eastward or westward rotations of up to 60 degrees, thus enlarging the number of satellites that can be received by the associated satellite reception assembly with respect to the known art polar rotors.
  • the diameter, i.e. weight, of the satellite dish could be augmented up to 120 cm, thus further increasing the number of receivable satellites.
  • the elastic resistance of the spring 4 reduces current consumption during the descending rotations as well. During these rotations, in fact, such resistance helps the braking action that the motor 2 has to exercise to counterbalance the gravity force moment, which tends to accelerate dish antenna descending.
  • the dish antenna 300 can be effectively moved at an angular velocity between about 1.6 deg s -1 and 2.5 deg s -1 , which allows quick satellite finding.
  • both the zero relay 108 and the west stop relay 107 are activated by the zero magnet 91, the rotation magnets 92 and 93 and the west stop magnet 94, taken in couples of adjacent magnets.
  • the two stop magnets 94 and 95 and the two stop relays 107 and 109 implement a stop sensing unit, apt to reveal that the rotor device 1 has reached a maximal eastward or westward angular displacement.
  • the relays through the relay cables 110, can supply to the motor control system information about the westward or eastward angular position of the gear wheel 34, i.e. of the dish antenna 300.
  • adjustment screws 180 and 190 allow regulating the relay position, for an optimal detection of the gear wheel angular position.
  • zero magnets 91, the rotation magnets 92 and 93 and the west stop magnet 93 could be also arranged at the east side of the gear wheel 34, and the arrangement of the east stop relay 95 and of the relays 107, 108 and 109 modified accordingly, without affecting the principle of operation of the angular position sensing system.
  • the limited extension of the engagement between the wormgear 31 and the gear wheel 34 provides an emergency stop system.
  • such limited engagement extension is determined by the limited length 312 of the threaded profile 311 and by the limited angular extension ⁇ of the toothed profile 341.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP00201516A 1999-04-29 2000-04-27 Dispositif rotative pour antenne de réception par satellite Withdrawn EP1049194A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MT99134499 1999-04-29
MT134499 1999-04-29

Publications (2)

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EP1049194A2 true EP1049194A2 (fr) 2000-11-02
EP1049194A3 EP1049194A3 (fr) 2002-10-02

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2829299A1 (fr) * 2001-09-05 2003-03-07 Texas De France Monture equatoriale equilibrable pour antenne satellite parabolique
WO2006122681A1 (fr) * 2005-05-18 2006-11-23 Pctel Inc. Assemblage d’antenne
DE202008001733U1 (de) * 2008-02-06 2009-06-25 Robot Visual Systems Gmbh Anordnung zur Erfassung von Verkehrsverstößen mit einer auf einem Schwenkmast montierten Kamera
US8509716B2 (en) 2005-09-19 2013-08-13 Thomson Licensing Adaptive impedance for LNB power supply output in dependence on communication mode/protocol
EP2894715A1 (fr) * 2014-01-13 2015-07-15 Teleco S.p.A. Procédé et appareil de commande pour des antennes paraboliques motorisées, de préférence pour des véhicules de loisirs et analogues
CN110740278A (zh) * 2019-11-08 2020-01-31 广州功首卫星科技有限公司 一种私人使用的太阳能供电的卫星电视接收器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105552528A (zh) * 2016-02-04 2016-05-04 柳州长虹数控机床有限责任公司 一种天线倒伏装置的传动结构

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Publication number Priority date Publication date Assignee Title
US4741532A (en) * 1982-07-26 1988-05-03 Kabushiki Kaisha Universal Reel drive device for slot machine
US4864322A (en) * 1986-03-06 1989-09-05 Asmo Co., Ltd. Apparatus for reducing stress on component elements during extension and contraction of motor-driven antenna apparatus for vehicles
US5009115A (en) * 1989-03-10 1991-04-23 Neyrpic Framatome Mecanique Device for driving in rotation a structure of large diameter particularly an antenna
EP0532960A1 (fr) * 1991-09-06 1993-03-24 Siemens Aktiengesellschaft Radioémetteur-récepteur portable et compact avec une antenne-fouet escamotable ou rabattable
US5485169A (en) * 1991-12-19 1996-01-16 Furuno Electric Company, Limited Antenna orienting apparatus for vehicles
DE19519723A1 (de) * 1994-06-20 1996-03-21 Walter Nicolai Vorrichtung zur Ein- oder Rückstellung der Verdrängungsgröße einer Volumenänderungseinrichtung an einem gegenüber der Atmosphäre oder einem sonstigen Bezugsdruck absperrbaren Behälter oder Hohlkörper

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4741532A (en) * 1982-07-26 1988-05-03 Kabushiki Kaisha Universal Reel drive device for slot machine
US4864322A (en) * 1986-03-06 1989-09-05 Asmo Co., Ltd. Apparatus for reducing stress on component elements during extension and contraction of motor-driven antenna apparatus for vehicles
US5009115A (en) * 1989-03-10 1991-04-23 Neyrpic Framatome Mecanique Device for driving in rotation a structure of large diameter particularly an antenna
EP0532960A1 (fr) * 1991-09-06 1993-03-24 Siemens Aktiengesellschaft Radioémetteur-récepteur portable et compact avec une antenne-fouet escamotable ou rabattable
US5485169A (en) * 1991-12-19 1996-01-16 Furuno Electric Company, Limited Antenna orienting apparatus for vehicles
DE19519723A1 (de) * 1994-06-20 1996-03-21 Walter Nicolai Vorrichtung zur Ein- oder Rückstellung der Verdrängungsgröße einer Volumenänderungseinrichtung an einem gegenüber der Atmosphäre oder einem sonstigen Bezugsdruck absperrbaren Behälter oder Hohlkörper

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2829299A1 (fr) * 2001-09-05 2003-03-07 Texas De France Monture equatoriale equilibrable pour antenne satellite parabolique
WO2006122681A1 (fr) * 2005-05-18 2006-11-23 Pctel Inc. Assemblage d’antenne
US8509716B2 (en) 2005-09-19 2013-08-13 Thomson Licensing Adaptive impedance for LNB power supply output in dependence on communication mode/protocol
DE202008001733U1 (de) * 2008-02-06 2009-06-25 Robot Visual Systems Gmbh Anordnung zur Erfassung von Verkehrsverstößen mit einer auf einem Schwenkmast montierten Kamera
EP2894715A1 (fr) * 2014-01-13 2015-07-15 Teleco S.p.A. Procédé et appareil de commande pour des antennes paraboliques motorisées, de préférence pour des véhicules de loisirs et analogues
CN110740278A (zh) * 2019-11-08 2020-01-31 广州功首卫星科技有限公司 一种私人使用的太阳能供电的卫星电视接收器
CN110740278B (zh) * 2019-11-08 2020-06-26 泉州燕群广告有限公司 一种私人使用的太阳能供电的卫星电视接收器

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