WO1998022992A2 - Direct broadcast satellite system for multiple dwelling units - Google Patents
Direct broadcast satellite system for multiple dwelling units Download PDFInfo
- Publication number
- WO1998022992A2 WO1998022992A2 PCT/US1997/021086 US9721086W WO9822992A2 WO 1998022992 A2 WO1998022992 A2 WO 1998022992A2 US 9721086 W US9721086 W US 9721086W WO 9822992 A2 WO9822992 A2 WO 9822992A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- satellite
- signals
- signal
- frequency band
- television
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 27
- 230000009977 dual effect Effects 0.000 claims abstract description 20
- 230000010287 polarization Effects 0.000 claims abstract description 19
- 239000002131 composite material Substances 0.000 claims description 17
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 16
- 238000009434 installation Methods 0.000 description 8
- 101710195281 Chlorophyll a-b binding protein Proteins 0.000 description 5
- 101710143415 Chlorophyll a-b binding protein 1, chloroplastic Proteins 0.000 description 5
- 101710181042 Chlorophyll a-b binding protein 1A, chloroplastic Proteins 0.000 description 5
- 101710091905 Chlorophyll a-b binding protein 2, chloroplastic Proteins 0.000 description 5
- 101710095244 Chlorophyll a-b binding protein 3, chloroplastic Proteins 0.000 description 5
- 101710127489 Chlorophyll a-b binding protein of LHCII type 1 Proteins 0.000 description 5
- 101710184917 Chlorophyll a-b binding protein of LHCII type I, chloroplastic Proteins 0.000 description 5
- 101710102593 Chlorophyll a-b binding protein, chloroplastic Proteins 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000002547 anomalous effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
- H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving
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- 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
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/247—Supports; Mounting means by structural association with other equipment or articles with receiving set with frequency mixer, e.g. for direct satellite reception or Doppler radar
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
- H01Q21/245—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction provided with means for varying the polarisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
-
- 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
- H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
Definitions
- This invention relates to systems for receiving direct satellite signals for television, and particularly to arrangements for receiving such signals in a multiple-dwelling environment.
- Direct satellite television systems for use in private homes have recently become popular as a replacement for cable television service.
- a typical single family home installation for such systems is shown in block diagram in Figure 1.
- the system includes a parabolic satellite receiving antenna 12, which provides separate signal outputs corresponding to satellite transmission signals which are left- hand and right-hand circularly polarized.
- a switch 14 is provided in the vicinity of receiving antenna 12 to select one of the antenna output signals, according to the desired viewing channel.
- a satellite receiver 16 which has separate RF cable inputs for receiving signals from satellite antenna 12 over cable 20 and signals from off-air receiving antenna 18 over cable 22.
- an internal RF switch connects antenna cable 22 to output cable 23 and a television set 24.
- the satellite signal on cable 20 is down converted by receiver 16 to a selected television channel, and the signal as converted, is provided to television set 24 on cable 23.
- a control signal for the operation of switch 14 is provide by receiver 16 on RF cable 20, according to the selected satellite channel. While the configuration of Figure 1 is effective in a single- family home environment, it cannot effectively be used in a multi-family dwelling unit, because of the need to switch antenna polarization according to the satellite viewing channel selected by the receiver. Further, there are alternate satellite services available at ka-band that require a linearly polarized receiving antenna. The signals from such additional antennas cannot be easily provided to residents of multi-family dwelling units.
- a system for distributing satellite television signals to multiple users includes a satellite antenna system for receiving satellite signals with first and second polarization and for providing such signals on output first and second transmission lines.
- the system includes a dual transmission line distribution system for providing signals corresponding to both polarizations to a plurality of user locations, and a switch at each selected user location for selectively connecting either the first or second signal to a satellite receiver.
- the system further includes a broadcast signal antenna system for receiving broadcast signals and combining them with at least one of the satellite signals for distribution in the dual transmission-line distribution system.
- a broadcast signal antenna system for receiving broadcast signals and combining them with at least one of the satellite signals for distribution in the dual transmission-line distribution system.
- At each user location there may be provided means for providing the broadcast signals to a television receiver.
- the broadcast signals are combined with both of the satellite signals.
- a double-pole, double-throw switch can be used to couple the broadcast signals to the television receiver and for selectively connecting the satellite signals to the satellite receiver.
- a diplexer can be used to separate the broadcast television signals.
- a signal up- converter is provided for converting the second satellite signal to a second frequency band, higher than its original frequency band.
- the first and second satellite signals are thereafter combined to provide a combined satellite signal to a single transmission line distribution system.
- broadcast signals from a broadcast receiving antenna system are also combined with the combined satellite signals.
- Methods for distributing signals are also provided.
- a third satellite signal may be distributed.
- a dual frequency converter for converting the second and third satellite signals to frequencies above and below the first satellite signal.
- Signals may also be distributed in two stages for some applications. In a first distribution stage signals are distributed on separate transmission lines to a plurality of frequency converters. Thereafter the signals are distributed to users on a common transmission line, preferably using broad band diode steered splitters.
- Figure 1 is a block diagram showing a direct satellite television receiving arrangement according to the prior art.
- Figure 2 is a block diagram showing a satellite television signal distribution system for a multiple dwelling unit according to the present invention.
- Figure 3 is a block diagram showing an alternate satellite television signal distribution system in accordance with the present invention.
- Figure 4 is a block diagram showing a dual directional coupler for the system of Figure 2.
- Figure 5 is a block diagram showing a user location configuration for the system of Figure 2.
- Figure 6 is a block diagram showing an alternate user location configuration for the system of Figure 2.
- Figure 7 is a block diagram showing a user location configuration for the distribution system of Figure 3.
- Figure 8 is a block diagram showing a further alternate satellite television signal distribution system in accordance with the present invention.
- FIG. 9 is a block diagram showing a further alternate satellite television signal distribution system in accordance with the present invention.
- Figure 10 is a diagram showing an upconverter for use in the Figure 8 system.
- Figure 11 is a diagram showing an upconverter for use in the Figure 9 system.
- Figure 12 is a diagram showing a downconverter for use in the Figure
- Figure 13 is a diagram showing a downconverter for use in the Figure
- Figure 14 is a diagram showing an alternate downconverter for use in the Figure 9 system. DESCRIPTION OF THE PREFERRED EMBODIMENTS
- Figure 2 illustrates an embodiment of the present invention for loop thru distributing broadcast and satellite television signals to multiple users in an apartment building.
- the building has 6 floors with 4 apartments on each floor.
- this example is exemplary only and that the principles of the invention can be adapted to dwellings having greater or fewer apartments, and can be applied to communities having dwelling units in separate, attached or unattached units, such as condominiums.
- the system of Figure 2 is configured to provide the residents with options as to whether or not they desire to subscribe to a satellite-based, direct broadcast television system, and also provides a master television antenna system available to all residents, similar to currently used master antenna systems. This provides the ability to rebuild an existing master antenna television system by replacing old directional couplers with new ones and using existing cables and conduits.
- the system includes a signal acquisition arrangement, which is preferably located on the building roof adjacent the satellite antenna 12 and broadcast receiving antenna 18. It is also possible to locate some of the acquisition equipment in other portions of the building to accommodate existing cable systems.
- the signal acquisition equipment includes a parabolic satellite antenna with dual feed, dual polarity low noise block-converter feed 12 having outputs for left and right hand circular polarization, which are provided to separate amplifiers 30 and 32.
- the low noise block-converter feed and amplifiers are powered by a power supply 34 and power inserter 36 which may be arranged remote from the amplifiers 30, 32, which are preferably at or close to antenna 12.
- Signals received on broadcast antenna 18 are provided to an amplifier 38 and thereafter to power divider 40. These broadcast signals are thereafter combined with the amplified satellite signals corresponding to left and right hand polarization in combiners 42 and 44 respectively.
- the satellite signals are in a frequency band of 950 to 1450 MHZ, while broadcast signals from antenna 18 are within the frequency range 50 to 860 MHZ.
- combiners 42, 44 which may be diplexers, can provide an output having an overall frequency band of 50 to 1450 MHZ and containing both broadcast and satellite signals.
- combiner 42 The output of combiner 42 is provided to splitter 46 and thereafter to transmission lines 48, 49, 50 and 51 which are serially routed through each of the apartments in the building.
- the output of combiner 44 is provided to splitter 52 and routed to all apartments over transmission lines 53, 54, 56 and 58.
- Each apartment is provided with a dual output coupler 60, which has a coupling value dependent on its position within the distribution system. Coupler 60 is shown in Figure 4.
- dual couplers 60a provide output coupling of -25db
- couplers 60b provide -20db
- couplers 60c provide -16db
- couplers 60d provide -12db
- couplers 60e provide - 12db
- couplers 60f provide - 1 Odb.
- the variation in coupling values of dual couplers 60 provides a relatively constant signal level for the output broadcast and satellite signals at each apartment, as indicated by the typical signal levels indicated in Figure 2.
- Signal levels required on the customer satellite device input should be not less than 0 dbmv for the satellite signal and +6 dbmv for the OFF-AIR signal.
- Dual couplers 60 consist of conventional high frequency directional coupler devices with the selected values of coupled signal level. Essentially, each of the two directional couplers incorporated into device 60, provides a coupled signal from one of the transmission lines to an output terminal.
- the equipment at each user installation depends on the service requested by that individual user. Accordingly, a user who merely desires to receive broadcast television signals may connect his television receiver 24 to either of the outputs of dual coupler 60, since both outputs include a signal corresponding to the broadcast signals received by antenna 18. No further equipment or signal processing is needed. In the event a user desires to subscribe to direct satellite television services, that user needs to be provided with additional equipment as shown in Figure 5.
- the additional equipment consists of a double-pole, double- throw switch 62, having inputs connected to the cables carrying the combined left-hand and right-hand satellite signals and the broadcast signal.
- the satellite receiver 16 and television set 24 are identical to those used in the prior art single-family home installation depicted in Figure 1.
- the double-pole, double-throw switch 62 has inputs connected to the outputs of dual coupler 60 corresponding to the combined satellite and broadcast antenna signals, and has outputs connected to the off-air and satellite inputs of receiver 16.
- the switch signal on cable 20 controls switch 62 thus directing an appropriate combined signal to the satellite terminal of receiver 16.
- switch 62 When receiver 16 is tuned to receive off-air broadcast television signals, the position of switch 62 is unimportant, since either position of switch 62 provides the off-air signal on cable 22.
- FIG. 6 is a block diagram illustrating an alternate embodiment for the distribution system of the present invention wherein only a single transmission line distribution system is required.
- the Figure 3 embodiment has a disadvantage, in that it is necessary to provide modifications to the satellite receiver of the standard type in order to implement the single cable distribution system, as will be explained.
- right and left-hand polarization signals are provided by antenna 12 to corresponding amplifiers 30 and 32 as in the Figure 2 embodiment.
- the signal corresponding to right-hand polarization which has an initial frequency band of 950 to 1450 MHZ is provided to up converter and combiner 72 wherein the frequency band is converted, for example, to the frequency band of 1690 to 2190 MHZ and thereafter combined with the signal corresponding to left- hand polarization.
- the frequency band may be selected to be any appropriate value, sucj as 1525 to 2025 MHz.
- Preferably combining is done in a diplexer, which provides an output combined satellite signal having a frequency band of 950 to 2190 MHz.
- Broadcast signals received on antenna 18 and amplified by amplifier 38 are combined with the output of head-end amplifier 74 in combiner 42' whose output includes signals in the range of 50 to 860 MHZ corresponding to broadcast television signals, signals in the range of 950 to 1450 MHz, corresponding to left-hand circular polarization signals, and signals in the range of 1690 to 2190 MHZ corresponding to the frequency up-converted right-hand polarization satellite signals.
- Coupler 76 for providing output signals to a satellite receiver or television set, according to the requirements of the individual user. Where a user desires to only receive broadcast transmissions, the signal from couplers
- 76 may be directly provided to a television set 24.
- the television set responds only to the signals in the frequency range 50 to 860 MHz and provides normal television operation.
- Coupler 76 the signal from coupler 76 is provided to specially adapted satellite receiver 70 as shown in Figure 7.
- Receiver 70 incorporates a standard satellite receiver 16, diplexer 78 switch 80 and a down converter 82.
- Switch 80 is operated similar to switch 62 of Figure 4 to select between satellite signals corresponding to left and right hand circular polarization. If, for example, signals corresponding to left hand circularly polarized transmissions contain the desired channel, switch 80 is configured to connect the signal from coupler 76 through diplexer 78 to the input of satellite receiver 16.
- switch 80 is operated by a control signal on line 20 to connect the signal from coupler 76 through diplexer 78 to down converter 82 and thereafter to the input terminal of satellite receiver 16.
- a specially designed receiver which equipped with a RF tuner operating directly with the input frequencies of 950 - 2190 MHZ may be provided.
- FIG 8 there is shown an alternate arrangement for a satellite and broadcast television system according to the present invention, which is intended to take advantage to the extent possible of available components.
- the system illustrated in Figure 2 include series connected couplers in the distribution cables that must operate from the VHF broadcast frequency band through the 1450 MHZ distribution frequency of the satellite signal.
- the system of Figure 3 uses signals from 50 through 2190 MHZ. It is difficult to provide components, such as amplifiers or couplers that operate efficiently over such a wide band.
- the alternate system of Figure 8 provides for separate series connected couplers for each of the two satellite signals and the off-air signal through cables 101, 103 and 105, which have couplers 100, 102 and 104 providing the signals to a sub- distribution system, for example on each floor of the building. Accordingly, couplers
- 100a, 100b, 102a, 102b etc. and amplifier 30', 32' in cables 101 and 103 can be designed to operate over only the 950-1450 MHZ band.
- couplers 104 and amplifier 38' are required only to operate over the VHF-UHF TV range, so conventional commercial components can be used.
- the sub-distribution system of the Figure 8 installation include upconverter 110, amplifier 112, diplexer 114, divider 116 and diode steered splitters 118 to individual customer drops.
- amplifier 120 and a further diode steered splitter 112 which connects to downconverters 124 associated with satellite receivers 70 and TV sets 24.
- Upconvertrer 110 is shown in Figure 10. Signal inputs are provided from couplers 100, 102 and 104. The signal from coupler 100 is up-converted from 950-1450 to 1525 to 2025 MHZ using local oscillator 170, mixer 172 and high pass filter 174. This is combined in diplexer 176 to provide a combined satellite signal over a 950-2025 MHZ band, which is amplified in amplifier 112. The off-air signal from coupler 104 is combined in diplexer 114 to provide an output composite signal for distribution. It is to be noted that power for the active components in upconverter 110 is provided over the RF cable from the downconverters and eventually from the receivers.
- a power by-pass 178 is provided to provide dc power to components in the upstreaml serial distribution system. Since power for upconverter 110 is provided from the receiver, the distribution of signals is preferably provided using diode-steered splitters 118, which effectively open-circuit an output line if the receiver is not present, since the corresponding diode is reverse biased Divider 116 may also be a diode-steered splitter. Further, interference from unterminated transmission lines giving anomalous impedance at the junction is avoided.
- Downconverter 124 which is provided at each satellite equipped customer station is shown in Figure 12.
- the signal from upconverter 110, provided through diode steered splitters, 118 is input at terminal 180.
- the off-air signal is filtered by low-pass filter 182 and provided to output terminal 184 from which it is provided to the "off air" terminal of the satellite receiver 70.
- the satellite receiver 70 provides alternative 13 or 18 volt dc power on the satellite input cable connected to terminal 186 of downconverter 124.
- the alternate voltage levels are used in a conventional installation, as shown in Figure 1 , to operate polarization switch 14.
- the voltage levels are used to operate switches 190 and 192. In the position shown in Figure 12 switches 190 and
- the composite satellite signal from high pass filter 183 is provided to a dual conversion heterodyne circuit, which transposes the 1525-2025 MHz. LHCP satellite signal into the 950 to 1450 MHZ band.
- the dual conversion includes local oscillators 194 and 200, mixers 196 and 202 and low pass filters 198 and 203. Dual conversion is used to avoid local oscillator harmonies in the passband.
- the downconverter also includes a d.c. bypass 188 to provide d.c. power from the satellite receive to the upstream components.
- the Figure 9 system is similar in overall configuration to the Figure 8 system, but provides four vertical series distribution cables 142, 144, 146 and 148, each with series connected couplers 150, 152, 154 and 156.
- the Figure 9 system is arranged to provide the conventional LHCP and
- RHCP satellite signals from direct broadcast satellite (DBS) antenna 12' and additionally provides downconverted signals derived from linearly polarized fixed satellite system signals (FSS) received by a fixed satellite services separate antenna fed on antenna 12'.
- the FSS signals are transposed to the same 950-1450 intermediate frequency band as the LHCP and RHCP signals.
- the fss signals are distributed via series coupled cable 142, the other satellite signals are distributed via cables 144 and 146.
- Off-air signals are separately received on VHF antenna 17 and UHF antenna 19.
- UHF signals are transposed in UHF to VHF converter 140 and combined with VHF signals in diplexer 141 for distribution over series coupled cable 148 in the 50 to 300 MHZ band.
- Sub-distribution systems for example, one on each floor or each two or more floors of an apartment building, are provided with an upconverter 160, amplifier 112 and diplexer 114.
- Signal splitter 116 and diode steered splitters 118 provide the composite signal to individual apartments.
- Upconverter 160 is arranged to provide a composite satellite signal from the three satellite signals for combination with the off-air signal and local distribution to users.
- the configuration for upconverter 160 is shown in Figure 11. Upconverter 160 is similar to upconverter 110 in that the LHCP signal from coupler 152 is upconverted to 1525-2025 MHz using local oscillator 220, mixer 222 and high pass filter 226.
- the filtered output is then combined in diplexer 230 with the RHCP signal from coupler 154.
- the signal from local oscillator 220 is also provided to mixer 224 wherein it is combined with the FSS derived signal from coupler 150.
- the effect is to downconvert the signal following low-pass filter 228 to the 375-875 MHz band.
- the fss, downconverted signal is combined with the other satellite signals in diplexer 236 and with the off-air signals in diplexer 238.
- the output at terminal 242 is a four band signal covering the frequency range 50-2025 MHz.
- D.C. bypass and power supply 240 is also provided to supply power to upstream components and the active elements of upconverter 160.
- Figure 13 illustrates the downconverter 162 for use in the distribution system of Figure 9.
- the composite signal from upconverter 160, after distribution by diode steered splitters 118 is provided to terminal 244.
- Low pass filter 246 separates the off-air signal in the 50-300 MHz band and provides the separated signal to terminal 276 for connection to the "off-air" terminal of satellite receiver 70.
- High pass filter 248 separates the three-band satellite signals and provides them to three- way switch 250.
- Switch 250 includes two poles corresponding to the poles of switch
- switches 250 and 252 In the leftmost position (corresponding to 18v. d.c), the composite signal is supplied through switch 252 to satellite signal output terminal 278, which is connected to the satellite input of the satellite receiver 70 for reception of the 950 to 1450 MHZ band of the composite signal.
- the center position (13v. d.c.) of switches 250 and 252 provides a two-stage heterodyne downconversion of signals using local oscillators 254, 256, mixers 258, 262 and filters 266 to 270, which convert the 1425-2025 MHZ band signals to the 950-1450 band for reception in satellite receiver 70.
- the third position of switches 250 and 252 is controlled by a combination 13 v. d.c.
- a single local oscillator 300 is provided to supply signals to mixers 302, 304.
- Mixer 304 responds to upconvert the 375-875 MHz band to 950 to 1450 MHz.
- Mixer 302 responds to convert the 1525-2025 MHz frequency band to 950 tp 1450 MHz.
- Bandpass filter 306, 308 are provided at the mixer outputs.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002270429A CA2270429A1 (en) | 1996-11-18 | 1997-11-18 | Direct broadcast satellite system for multiple dwelling units |
AU53581/98A AU5358198A (en) | 1996-11-18 | 1997-11-18 | Direct broadcast satellite system for multiple dwelling units |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/751,320 | 1996-11-18 | ||
US08/751,320 US5787335A (en) | 1996-11-18 | 1996-11-18 | Direct broadcast satellite system for multiple dwelling units |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1998022992A2 true WO1998022992A2 (en) | 1998-05-28 |
WO1998022992A3 WO1998022992A3 (en) | 1998-07-09 |
Family
ID=25021478
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1997/021086 WO1998022992A2 (en) | 1996-11-18 | 1997-11-18 | Direct broadcast satellite system for multiple dwelling units |
Country Status (4)
Country | Link |
---|---|
US (1) | US5787335A (en) |
AU (1) | AU5358198A (en) |
CA (1) | CA2270429A1 (en) |
WO (1) | WO1998022992A2 (en) |
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WO2007070663A2 (en) * | 2005-12-13 | 2007-06-21 | The Directv Group, Inc. | Multiple dwelling unit satellite television delivery system |
US7352991B2 (en) | 2002-03-21 | 2008-04-01 | National Antenna Systems | Satellite signal distribution systems |
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- 1997-11-18 WO PCT/US1997/021086 patent/WO1998022992A2/en active Application Filing
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WO2007047385A1 (en) * | 2005-10-12 | 2007-04-26 | The Directv Group, Inc. | Band upconverter approach to ka/ku signal distribution |
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US7788694B2 (en) | 2005-12-13 | 2010-08-31 | The Directv Group, Inc. | Multiple dwelling unit satellite television delivery system |
US8627382B2 (en) | 2005-12-13 | 2014-01-07 | The Directv Group, Inc. | Multiple dwelling unit satellite television delivery system |
Also Published As
Publication number | Publication date |
---|---|
AU5358198A (en) | 1998-06-10 |
CA2270429A1 (en) | 1998-05-28 |
US5787335A (en) | 1998-07-28 |
WO1998022992A3 (en) | 1998-07-09 |
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