Not applicable.
1. Field of the Invention
The subject invention relates to alignment devices and, more particularly, to devices for aligning an antenna with a satellite.
2. Description of the Invention Background
The advent of the television can be traced as far back to the end of the nineteenth century and beginning of the twentieth century. However, it wasn't until 1923 and 1924, when Vladimir Kosma Zworkykin invented the iconoscope, a device that permitted pictures to be electronically broken down into hundreds of thousands of components for transmission, and the kinescope, a television signal receiver, did the concept of television become a reality. Zworkykin continued to improve those early inventions and television was reportedly first showcased to the world at the 1939 World's Fair in New York, where regular broadcasting began.
Over the years, many improvements to televisions and devices and methods for transmitting and receiving television signals have been made. In the early days of television, signals were transmitted over terrestrial networks and received through the use of antennas. Signal strength and quality, however, were often dependent upon the geography of the land between the transmitting antenna and the receiving antenna. Although such transmission methods are still in use today, the use of satellites to transmit television signals is becoming more prevalent. Because satellite transmitted signals are not hampered by hills, trees, mountains, etc., such signals typically offer the viewer more viewing options and improved picture quality. Thus, many companies have found offering satellite television services to be very profitable and, therefore, it is anticipated that more and more satellites will be placed in orbit in the years to come. As additional satellites are added, more precise antenna/satellite alignment methods and apparatuses will be required.
Modem digital satellite communication systems typically employ a ground-based transmitter that beams an uplink signal to a satellite positioned in geosynchronous orbit. The satellite relays the signal back to ground-based receivers. Such systems permit the household or business subscribing to the system to receive audio, data and video signals directly from the satellite by means of a relatively small directional receiver antenna. Such antennas are commonly affixed to the roof or wall of the subscriber's residence or are mounted to a tree or mast located in the subscriber's yard. A typical antenna constructed to received satellite signals comprises a dish-shaped reflector that has a support arm protruding outward from the front surface of the reflector. The support arm supports a low noise block amplifier with an integrated feed “LNBF”. The reflector collects and focuses the satellite signal onto the LNBF which is connected, via cable, to the subscriber's television.
To obtain an optimum signal, the antenna must be installed such that the centerline axis of the reflector, also known as the “bore site” or “pointing axis”, is accurately aligned with the satellite. To align an antenna with a particular satellite, the installer must be provided with accurate positioning information for that particular satellite. For example, the installer must know the proper azimuth and elevation settings for the antenna. The azimuth setting is the compass direction that the antenna should be pointed relative to magnetic north. The elevation setting is the angle between the Earth and the satellite above the horizon. Many companies provide installers with alignment information that is specific to the geographical area in which the antenna is to be installed. Also, as the satellite orbits the earth, it may be so oriented such that it sends a signal that is somewhat skewed. To obtain an optimum signal, the antenna must also be adjustable to compensate for a skewed satellite orientation.
The ability to quickly and accurately align the centerline axis of antenna with a satellite is somewhat dependent upon the type of mounting arrangement employed to support the antenna. Prior antenna mounting arrangements typically comprise a mounting bracket that is directly affixed to the rear surface of the reflector. The mounting bracket is then attached to a vertically oriented mast that is buried in the earth, mounted to a tree, or mounted to a portion of the subscriber's residence or place of business. The mast is installed such that it is plumb (i.e., relatively perpendicular to the horizon). Thereafter, the installer must orient the antenna to the proper azimuth and elevation. These adjustments are typically made at the mounting bracket.
One method that has been employed in the past for indicating when the antenna has been positioned at a proper azimuth orientation is the use of a compass that is manually supported by the installer under the antenna's support arm. When using this approach however, the installer often has difficulty elevating the reflector to the proper elevation so that the antenna will be properly aligned and then retaining the antenna in that position while the appropriate bolts and screws have been tightened. The device disclosed in U.S. Pat. No. 5,977,922 purports to solve that problem by affixing a device to the support arm that includes a compass and an inclinometer. In this device, the support arm can move slightly relative to the reflector and any such movement or misalignment can contribute to pointing error. Furthermore, devices that are affixed to the support arm are not as easily visible to the installer during the pointing process. In addition, there are many different types and shapes of support arms which can require several different adapters to be available to the installer. It will also be understood that the use of intermediate adapters could contribute pointing error if they do not interface properly with the support arm.
Another method that has been used in the past to align the antenna with a satellite involves the use of a “set top” box that is placed on or adjacent to the television to which the antenna is attached. A cable is connected between the set top box and the antenna. The installer initially points the antenna in the general direction of the satellite, then fine-tunes the alignment by using a signal strength and quality meter displayed on the television screen by the set top box. The antenna is adjusted until the onscreen meter indicates that signal strength and quality have been maximized. In addition to the onscreen display meter, many set top boxes emit a repeating tone. As the quality of the signal improves, the frequency of the tones increases. Because the antenna is located outside of the building in which the television is located, such installation method typically requires two individuals to properly align the antenna. One installer positions the antenna while the other installer monitors the onscreen meter and the emitted tones. One individual can also employ this method, but that person typically must make multiple trips between the antenna and the television until the antenna is properly positioned. Thus, such alignment methods are costly and time consuming.
In an effort to improve upon this shortcoming, some satellite antennas have been provided with a light emitting diode (“LED”) that operates from feedback signals fed to the antenna by the set top box through the link cable. The LED flashes to inform the installer that the antenna has been properly positioned. It has been noted, however, that the user is often unable to discern small changes in the flash rate of the LED as antenna is positioned. Thus, such approach may result in antenna being positioned in an orientation that results in less than optimum signal quality. Also, this approach only works when the antenna is relative close to its correct position. It cannot be effectively used to initially position the antenna. U.S. Pat. No. 5,903,237 discloses a microprocessor-operated antenna pointing aid that purports to solve the problems associated with using an LED indicator to properly orient the antenna.
Such prior antenna mounting devices and methods do not offer a relatively high amount of alignment precision. Furthermore, they typically require two or more installers to complete the installation and alignment procedures. As additional satellites are sent into space, the precision at which an antenna is aligned with a particular satellite becomes more important to ensure that the antenna is receiving the proper satellite signal and that the quality of that signal has been optimized. It is also desirable to have an antenna alignment device that can be effectively used by one installer.
There is a further need for an antenna alignment device that can be quickly and accurately attached to an antenna for providing an indication of the antenna's elevation, azimuth and skew orientations.
There is yet another need for an antenna alignment device that can be used in connection with a conventional set top box by an individual installer to optimize the satellite-transmitted signal received by the antenna.
There is still another need for a method of installing and aligning a satellite reflector antenna that can be quickly and efficiently accomplished by one installer.
In accordance with one form of the present invention, there is provided a compass that is removably attachable to a rear portion of an antenna reflector. The compass is so oriented relative to the centerline of the antenna reflector when it is affixed thereto such that it serves to display the azimuth reading for the centerline of the reflector. The compass may be digital or analog and be supported in a housing that is removably attachable to the rear portion of the antenna reflector. In one embodiment, the housing is removably attachable to the rear portion of the antenna reflector by a mounting member. The mounting member may be provided with a first pin that is sized to be received within a first hole provided in the rear portion of the reflector. The mounting member may further have a second pin that is sized to be received within a second hole in the rear portion of the reflector. In addition, the mounting member may have a movable pin assembly supported therein that includes a third pin that is sized to be received within a third hole in the rear portion of the reflector. The three pins serve to removably attach the mounting member to the rear portion of surface of the reflector.
In another embodiment, a level is removably attachable to a rear portion of the antenna reflector and is so oriented relative to the centerline axis of the reflector such that the level displays an elevation reading for the centerline of the reflector. The level may be digital or analog and be supported in a housing that is removably attachable to the rear portion of the antenna reflector. In one embodiment, the housing is removably attachable to the rear portion of the antenna reflector by a mounting member. The mounting member may be provided with a first pin that is sized to be received within a first hole provided in the rear portion of the reflector. The mounting member may further have a second pin that is sized to be received within a second hole in the rear portion of the reflector. In addition, the mounting member may have a movable pin assembly supported therein that includes a third pin that is sized to be received within a third hole in the rear portion of the reflector. The three pins serve to removably attach the mounting member to the rear portion of surface of the reflector.
Another embodiment of the present invention includes first and second digital levels that are removably attachable to the rear portion of an antenna reflector and are so oriented relative to each other and the centerline of the reflector such that they cooperate to generate a skew reading for the antenna's centerline axis. The first and second digital levels may be supported in a housing that is removably attachable to the rear portion of the antenna reflector. In one embodiment, the housing is removably attachable to the rear portion of the antenna reflector by a mounting member. The mounting member may be provided with a first pin that is sized to be received within a first hole provided in the rear portion of the reflector. The mounting member may further have a second pin that is sized to be received within a second hole in the rear portion of the reflector. In addition, the mounting member may have a movable pin assembly supported therein that includes a third pin that is sized to be received within a third hole in the rear portion of the reflector. The three pins serve to removably attach the mounting member to the rear portion of surface of the reflector.
One embodiment of the present invention includes a receiver and speaker that are removably attachable to a portion of an antenna reflector that is electronically connected to a set top box. The set top box is electrically coupled to a television and causes a series of tones to be emitted from the television speaker that is indicative of the antenna's alignment with a satellite. This embodiment further includes a microphone and transmitter that can be placed in the vicinity of the television speaker to transmit the emitted tones to the speaker attached to the satellite reflector. The receiver and speaker may be supported in a housing that is removably attachable to a rear portion of the satellite reflector. In one embodiment, the housing is removably attachable to the rear portion of the antenna reflector by a mounting member. The mounting member may be provided with a first pin that is sized to be received within a first hole provided in the rear portion of the reflector. The mounting member may further have a second pin that is sized to be received within a second hole in the rear portion of the reflector. In addition, the mounting member may have a movable pin assembly supported therein that includes a third pin that is sized to be received within a third hole in the rear portion of the reflector. The three pins serve to removably attach the mounting member to the rear portion of surface of the reflector.
In yet another embodiment of the present invention, a digital compass, and first and second digital levels, and a receiver and speaker are supported by a housing that is removably attachable to a portion of the antenna reflector. The housing may be removably attachable to a rear portion of the antenna reflector by a mounting member constructed in the above-described manner.
In still another embodiment of the present invention, an analog compass and an analog level may be supported in a housing that is removably attachable to the rear surface of an antenna reflector.
It is a feature of the present invention to provide apparatuses that may be removably attached to an antenna reflector and that quickly and accurately display readings that are indicative to the antenna's azimuth, elevation and/or skew positions.
Accordingly, the present invention provides solutions to the shortcomings of prior apparatuses and methods for orienting antennas for receiving satellite signals. Those of ordinary skill in the art will readily appreciate, however, that these and other details, features and advantages will become further apparent as the following detailed description of the embodiments proceeds.
In the accompanying Figures, there are shown present embodiments of the invention wherein like reference numerals are employed to designate like parts and wherein:
Referring now to the drawings for the purposes of illustrating embodiments of the invention only and not for the purposes of limiting the same,
The antenna 20 is attached to a satellite broadcast receiver (“set top box”) 60 by coaxial cable 62. The set top box 60 is attached to a television monitor 48. Such set top boxes are known in the art and comprise an integrated receiver decoder for decoding the received broadcast signals from the antenna 20. During operation, the feed/LNBF assembly 45 converts the focused signals from the satellite 14 to an electrical current that is amplified and down converted in frequency. The amplified and down-converted signals are then conveyed via cable 62 to the set top box 60. The set top box 60 tunes the output signal to a carrier signal within a predetermined frequency range. A tuner/demodulator within the set top box 60 decodes the signal carrier into a digital data stream selected signal. Also a video/audio decoder is provided within the set top box 60 to decode the encrypted video signal. A conventional user interface on the television screen is employed to assist the installer of the antenna 20 during the final alignment and “pointing” of the antenna 20.
In this embodiment, the mounting bracket 12 is attached to the wall of the building 10 or is affixed to a freestanding mast (not shown). The mounting bracket 12 has a mast 14 protruding therefrom that is sized to be received in a socket 46 in the mounting portion of the arm. As indicated above, the mounting bracket 12 may comprise the apparatus disclosed in co-pending U.S. patent application Ser. No. 09/751,460, entitled “Mounting Bracket”, the disclosure of which is herein incorporated by reference. In another alternative mounting arrangement, the rearwardly extending portion of the support arm 44 may have a protrusion 51 formed thereon or attached thereto that is sized to be received and retained within a mounting bracket 12′ that has a socket 13′ formed therein. See
Antenna 20 must be properly positioned to receive the television signals transmitted by the satellite 14 to provide optimal image and audible responses. This positioning process involves accurately aligning the antenna's centerline axis A—A, with the satellite's output signal. “Elevation”, “azimuth” and “skew” adjustments are commonly required to accomplish this task. As shown in
In this embodiment, the reflector 30 is molded from plastic utilizing conventional molding techniques. However, reflector 30 may be fabricated from a variety of other suitable materials such as, for example, stamped metal. The reflector 30 depicted in
Turning now to
Also in this embodiment, a first digital level 150 which has a digital display 152 is supported in the housing member 130 as shown in
This embodiment of the antenna-pointing device 100 also includes a skew meter generally designated as 160. The skew meter 160 includes a second digital level 162 of the type described above that is mounted perpendicular to the first digital level 152 (i.e., its centerline will be within the plane defined by the centerline axis A—A and the reflector's major axis A″—A″ when the device 100 is attached to the reflector 30). See
The mounting base 110 includes an attachment surface 112 that has a first pin 114 attached thereto that is sized to be inserted into the hole 82 in the first socket 80. A second pin 116 is attached to the mounting base 110 such that it is received in the second hole 86 in the second socket 84 when the first pin 114 is received in the hole 82 in the first socket 80. The centerlines of the first and second pins are located on a common axis G′—G′. See
To attach the mounting base 110 to the antenna reflector 30, the installer inserts the third pin 122 into the third hole 90 and applies a biasing force to the pointing device 100 until the first pin 114 may be inserted into the first hole 82 in first socket 80 and the second pin 116 may be inserted into the second hole 86 in the second socket 84. When pins (114, 116, and 122) have been inserted into their respective holes (82, 86, 90), the spring 129 applies a biasing force against the support member 110 that, in turn, biases the third pin 122 into frictional engagement with the inner surface of the third hole 90 in the third socket 88 to removably affix the pointing device 100 to the antenna reflector 30. When affixed to the reflector 30 in that manner (see
An alternative method of attaching an embodiment of the antenna-pointing device 100′ of the present invention is depicted in
To attach the mounting base 110′ to the antenna reflector 30, the installer inserts the third pin 122′ into the third hole 90 and applies a biasing force to the pointing device 100′ until the first pin 114′ may be inserted into the first hole 82 in first socket 80 and the second pin 116′ may be inserted into the second hole 86 in the second socket 84. When pins (114′, 116′, and 122′) have been inserted into their respective holes (82, 86, 90), the installer pivots the actuation portion 137′ of the locking lever 133′ in the direction represented by arrow “Y” in
The antenna-pointing device 100 may be employed to align the antenna's centerline axis A—A with the satellite as follows. After the antenna-mounting bracket 12 has been installed, the antenna 20 is affixed to the mounting bracket 12. In this embodiment, the mast portion 14 of the mounting bracket 12 is inserted into the socket 46 in the rear-mounting portion 44 of the arm assembly 40. The mast 14 is retained within the socket 46 by means of one or more setscrews 47 that extend through the rear-mounting portion 44 to engage the mast 14. See
Upon attachment to the reflector, the digital display 142 will display the azimuth reading for the antenna's initial position. The installer then adjusts the antenna's position until the digital display 142 displays the desired azimuth reading. The antenna 20 is then locked in that position.
The installer then observes the elevation reading displayed by the first digital compass display 152 and adjusts the position of the antenna until the elevation meter displays the desired reading and the antenna 20 is locked in that position. The setscrews 47 are loosened to permit the antenna to be rotated about the mast 14. The user then observes the skew meter display 169 and rotates the rearwardly extending portion 44 of the support arm 40 about the mast 14 until the skew meter display 169 displays the desired setting. Thereafter, the setscrews 47 are screwed into contact the support mast 14 to retain the antenna 20 in that position. The skilled artisan will appreciate that, because the centerline axis A—A is coaxially aligned with the centerline of the socket 46 in the support arm 40, the antenna 20 can be moved to the desired skew orientation by simply rotating the antenna reflector 30 about the mast 14. It will be further understood that the antenna pointing device 100 may also be used with other antennas that are mounted utilizing conventional mounting brackets and support apparatuses. The order of antenna adjustments described herein is illustrative only. Those of ordinary skill in the art will appreciate that the installer could, for example, set the skew first or the elevation first when orienting the antenna 20.
If the installer wishes to employ a set top box 60 to further optimize the antenna's alignment with the satellite 14, a coaxial cable 62 is attached to the feed/LNBF assembly 45 and the set top box 60. The antenna's position is further adjusted while monitoring the graphical display on the television 48 and the audio signal emitted by the set top box 60.
Another embodiment of the antenna pointing apparatus 100 of the present invention employs a speaker 170 that is supported on housing 130 and has a radio receiver antenna 175. This embodiment further includes a conventional transmitter 172 that is equipped with a conventional microphone 177. Transmitter 172 may be powered by batteries (not shown). Speaker 170 and transmitter 172 may be constructed of one way radio components like those sold as infant monitoring devices by Tandy Corporation and others or similar devices may be successfully employed. Those speakers 170 that employ a magnet should be mounted within the housing such that the magnet does not interfere with the operation of the digital or analog compass that may also be supported within the housing 130. Appropriate shielding means could also be employed.
To use the speaker 170 and transmitter 172, the user places the transmitter 172 adjacent to the television's audio speaker 49 such that it can receive and transmit the audio signals emitted during use of the set top box 60 to the speaker 170. The antenna-pointing device 100 is attached to the rear of the antenna reflector 30 in the above-described manner and further positioning adjustments are made to the antenna 20 until the emitted audio signal indicates that the optimum orientation has been achieved. Those of ordinary skill in the art will appreciate that most set top boxes emit a repeating tone at a frequency that increases as the satellite signal improves until the series of tones becomes a single tone. The antenna 20 is then retained in that position by locking the appropriate adjustment screws on the mounting bracket. Those of ordinary skill in the art will readily appreciate that such arrangement permits an individual installer to employ the set top box to achieve optimum positioning of the reflector without having to make several trips between the antenna and the television. To make the transmitter easy to locate and thus prevent it from becoming misplaced or lost during installation, it may be provided in a bright color, such a florescent orange, red, yellow, etc. In addition, to enable the installer to quickly identify which transmitter 172 corresponds to a particular antenna alignment device 100, the alignment device may be provided with a first bright color 101, such as, for example, fluorescent orange, red, yellow, etc. and the transmitter 172 may be provided in a second color 173 that is identical to the first color 101. See
The antenna alignment apparatuses of the present invention may comprise one or more of the following components: (i) digital compass, (ii) a first digital level, (iii) a second digital level, and/or (iv) a speaker. For example, as shown in
The housing 610 further has an attachment portion 640 for attaching the antenna-pointing device 600 to the rear surface 32 of the antenna reflector 30. More particularly and with reference to
To attach the attachment portion 640 to the antenna reflector 30, the installer inserts the third pin 652 into the third hole 90 and applies a biasing force to the pointing device 600 until the first pin 644 may be inserted into the first hole 82 in first socket 80 and the second pin 646 may be inserted into the second hole 86 in the second socket 84. When pins (644, 646 and 652) have been inserted into their respective holes (82, 86, 90), the spring 659 applies a biasing force against the movable support member 654 that, in turn, biases the third pin 652 into frictional engagement with the inner surface of the third hole 90 in the third socket 88 to removably affix the pointing device 200 to the antenna reflector 30. The skilled artisan will further appreciate that other methods of attaching the antenna-pointing device 600 to the rear portion of the antenna reflector 30 may be employed without departing from the spirit and scope of the present invention.
The antenna-pointing device 600 may be employed to align the antenna's centerline axis A—A with the satellite as follows. After the antenna-mounting bracket 12 has been installed, the antenna 20 is affixed to the mounting bracket 12. In this embodiment, the mast portion 14 of the mounting bracket 12 is inserted into the socket 46 in the rear-mounting portion 44 of the arm assembly 40. The mast 14 is retained within the socket 46 by means of one or more setscrews 47 that extend through the rear-mounting portion 44 to engage the mast 14. See
If the installer wishes to employ a set top box 60 to further optimize the antenna's alignment with the satellite 14, a coaxial cable 62 is attached to the feed/LNBF assembly 45 and the set top box 60. The antenna's position is further adjusted while monitoring the graphical display on the television 48 and the audio signal emitted by the set top box.
Another embodiment of the antenna pointing apparatus 600 of the present invention employs a receiver and speaker 670 and a receiver antenna 675 that are supported in the housing 610. This embodiment further includes a conventional microphone and transmitter 672. Speaker 670 and transmitter 672 may comprise those commercially available speakers and transmitters that are often sold as infant monitoring devices or similar devices may be successfully employed. To use the speaker 670 and transmitter 672, the user places the transmitter 672 adjacent to the television's audio speaker 49 such that it can receive and transmit the audio signals emitted during use of the set top box 60 to the speaker 670. The antenna-pointing device 600 is attached to the rear of the antenna reflector 30 in the above-described manner and further positioning adjustments are made to the antenna until the emitted audio signal indicates that the optimum orientation has been achieved. Those of ordinary skill in the art will appreciate that most set top boxes emit a repeating tone at a frequency that increases as the satellite signal improves until the series of tones becomes a single tone. The antenna is then retained in that position by locking the appropriate adjustment screws on the mounting bracket. Those of ordinary skill in the art will readily appreciate that such arrangement permits an individual installer to employ the set top box to achieve optimum positioning of the reflector without having to make several trips between the antenna and the television.
Thus, from the foregoing discussion, it is apparent that the present invention solves many of the problems encountered by prior antenna alignment devices and methods. In particular, various embodiments of the present invention are easy to install and use. The present invention enables one installer to quickly and efficiently install and align an antenna with a satellite. Various embodiments of the present invention enable the installer to also use a set top box to optimize the antenna's orientation without making several trips between the antenna and the television to which the set top box is attached. Those of ordinary skill in the art will, of course, appreciate that various changes in the details, materials and arrangement of parts which have been herein described and illustrated in order to explain the nature of the invention may be made by the skilled artisan within the principle and scope of the invention as expressed in the appended claims.
This application is a continuation of U.S. patent application Ser. No. 10/364,099, filed Feb. 11, 2003 now U.S. Pat. No. 6,795,033, which is a continuation of U.S. patent application Ser. No. 09/750,974, filed Dec. 29, 2000, now U.S. Pat. No. 6,683,581.
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Number | Date | Country | |
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Parent | 10364099 | Feb 2003 | US |
Child | 10862295 | US | |
Parent | 09750974 | Dec 2000 | US |
Child | 10364099 | US |