All About the Technology Behind Satellite TV
It’s a good idea to understand how satellite TV works, it is the future of television after all.
Usually, highly elliptical or geostationary satellites that orbit above the earth’s equator are used for television relays. Satellite television begins by receiving transmission through antenna connected to the uplink facility. The dishes used in uplink satellites are considerably larger in size (about 30 to 40 feet diameter). This increased diameter leads in providing more accurate aiming and enhanced signal strength. Such uplink dish is positioned in a way that its faces toward a particular satellite. Signals from this uplink dish are transmitted within a particular frequency range. This enables the transponders tuned to similar frequency range to receive the signals. These received signals are then retransmitted by the transponder back to the earth with different frequency range.
This signal path – retransmitted by satellite and received by earth station – is known as the downlink. A satellite may have up to 32 transponders or 24 transponders for Ku-band and C-band only satellites respectively. A transponder has bandwidth of approximately 36 to 50 Mbits/s. Every geo-stationary C-band satellite is spaced 2 degrees from another satellite for preventing possibility of interference. 1 degree spacing is considered adequate for K band. It is evident from the above that there is a maximum limit of 360/2 = 180 and 360/1 = 360 for geostationary C-band satellites and geostationary Ku-band satellites respectively. Transmission received through C-band can be affected by the terrestrial interference while transmission received through Ku-band is susceptible to the water (rain).
A parabolic dish receives the signals transmitted by the downlink and reflects these signals back to the focal point of the dish. A device known as feed horn is mounted at the focal point of the dish. In fact, f the feed horn is a front-end section of a waveguide. This waveguide collects the signals at the focal point, conducts the signals towards pickup connected to an LBN (Low-noise block) down-converter. The main function of LNB is to amplify the signals, filter the frequencies and convert the frequency to a lower frequency range.
In earlier days Low Noise Amplifiers connected at dish’s focal point were used in C-Band satellite TV systems. During those periods, 50 Ohm impedance cables were used for sending the amplified signal to indoor receiver. These 50 Ohm coaxial cables were considered very expensive. To overcome the cost factor, micro strip based converters were adapted, for Amateur Radio frequencies, for the 4GHz C-Band. These designs were based on the centralized idea that blocks down-conversion of a frequency, to a lower frequency and technologically easy conversion of block of frequencies can be achieved through this design. To facilitate this, satellite dishes were fitted with an LNBF that can integrate the feed horn with the LNB. By using the latest technology, the conversion of signals to a desired output (data, television, audio etc) can be achieved easily. The satellite receiver also demodulates and converts the transmitted signals to desired form. At times, the receiver may include the responsibility of unscrambling or decrypting. Such receivers are known as integrated decoder/receiver. Usually, low loss type (like RG-6 or RG-10, etc) cables are used for connecting the receiver to LNB or LNBF.Written by David Johnson. Find more information onDish Network Dealsas well as details regardingDish Network Promotions
Article Source: http://www.simplysearch4it.com/article/51733.html
|
|
10000 PCS MAXELL 3V MICRO LITHIUM CELL CR2025 CR 2025 BATTERY CR-2025 EXP12/2017 $2,999.99 |
|
|
10000 PCS MAXELL 3V MICRO LITHIUM CELL CR2032 CR 2032 BATTERY CR-2032 EXP12/2018 $2,999.99 |
|
|
10000 PCS MAXELL 3V MICRO LITHIUM CELL CR2016 CR 2016 BATTERY CR-2016 EXP12/2018 $2,999.99 |
|
|
4000 PCS MAXELL 3V MICRO LITHIUM CELL CR2025 CR 2025 BATTERY CR-2025 EXP:12/2017 $1,299.99 |
|
|
4000 PCS MAXELL 3V MICRO LITHIUM CELL CR2032 CR 2032 BATTERY CR-2032 EXP12/2018 $1,299.99 |
|
|
4000 PCS MAXELL 3V MICRO LITHIUM CELL CR2016 CR 2016 BATTERY CR-2016 EXP12/2018 $1,299.99 |
|
|
2000 PCS MAXELL 3V MICRO LITHIUM CELL CR2025 CR 2025 BATTERY CR-2025 EXP:12/2017 $699.99 |
|
|
2000 PCS MAXELL 3V MICRO LITHIUM CELL CR2016 CR 2016 BATTERY CR-2016 EXP12/2018 $699.99 |
|
|
2000 PCS MAXELL 3V MICRO LITHIUM CELL CR2032 CR 2032 BATTERY CR-2032 EXP12/2018 $699.99 |
|
|
1000 PCS MAXELL 3V MICRO LITHIUM CELL CR2025 CR 2025 BATTERY CR-2025 EXP:12/2017 $369.99 |
|
|
1000 PCS MAXELL 3V MICRO LITHIUM CELL CR2032 CR 2032 BATTERY CR-2032 EXP12/2018 $369.99 |
|
|
1000 PCS MAXELL 3V MICRO LITHIUM CELL CR2016 CR 2016 BATTERY CR-2016 EXP12/2018 $369.99 |
|
|
IronWorks Lithium Iron Phosphate Battery LifeP04 by Micro-Power (*READ*) $199.95 |
|
|
Hitachi 10.8V 1.5Ah Lithium Ion Micro Drive Drill and Impact Driver Combo Kit $203.97 |
|
|
Lot of (6) Pelican 1030 Micro Case Series w/ 3.7V Lithium Battery Pack $179.99 |
|
|
Power Tools 10.8 Volt Lithium Ion Micro Drill Driver DB10DL $157.57 |
|
|
Hitachi 10.8V Lithium Ion Micro Driver Drill DB10DL $125.99 |
|
|
Total Micro 40Y6797-TM Lithium-ion Notebook Battery for ThinkPad R60, T60, Z60m $120.75 |
|
|
Hitachi 12V Lithium Ion Micro Impact Driver DS10DFL $115.99 |
|
|
Hitachi DB10DL 10.8-Volt Lithium-Ion Micro Driver Drill $99.99 |
|
|
HITACHI 10.8V LITHIUM ION MICRO DRILL DRIVER DS10DFL $99.95 |
|
|
Hitachi 12V Peak Cordless HXP Lithium-Ion Micro Impact Driver WH10DFL NEW $106.98 |
|
|
200 PCS MAXELL 3V MICRO LITHIUM CELL CR2025 CR 2025 BATTERY CR-2025 EXP: 12/2017 $99.99 |
|
|
200 PCS MAXELL 3V MICRO LITHIUM CELL CR2032 CR 2032 BATTERY CR-2032 EXP: 12/2018 $99.99 |
|
|
200 PCS MAXELL 3V MICRO LITHIUM CELL CR2016 CR 2016 BATTERY CR-2016 EXP: 12/2018 $99.99 |
|
|
Hitachi 12V Peak Cordless 3/8-in Lithium-Ion Micro Drill Driver DS10DFL NEW $96.98 |
|
|
HITACHI 10.8V LITHIUM ION MICRO DRILL DRIVER DS10DFL $79.95 |
|
|
Total Micro 40Y7003-TM 8-Cell Lithium-ion Battery for Lenovo ThinkPad Tablet PC $87.18 |
|
|
MICRO LITHIUM CELL WATCH BATTERIES 100PCS.CR2330 3V $69.99 |
|
|
100pcs. NEW, CR1225 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $65.00 |
|
|
100pcs. NEW, CR927 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $59.99 |
|
|
Total Micro 312-0749-TM Lithium-ion 9-Cell Battery for Dell Latitude E6400, $66.55 |
|
|
100pcs.NEW, CR2430 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $59.00 |
|
|
Total Micro M8665G/A-TM Lithium-ion 6-cell Notebook Battery for _____ iBook 2nd $64.83 |
|
|
Hitachi WH10DFL 12V Peak Cordless HXP Lithium-Ion Micro Impact Driver $49.00 |
|
|
Hitachi DS10DFL 12V Peak Lithium Ion Micro Driver Drill $54.99 |
|
|
Hitachi WH10DFL 12 V Peak Lithium Ion Micro Impact Driver – USED-GC $47.00 |
|
|
100 PCS MAXELL 3V MICRO LITHIUM CELL CR2025 CR 2025 BATTERY CR-2025 EXP: 12/2017 $59.99 |
|
|
100 PCS MAXELL 3V MICRO LITHIUM CELL CR2016 CR 2016 BATTERY CR-2016 EXP: 12/2018 $59.99 |
|
|
100 PCS MAXELL 3V MICRO LITHIUM CELL CR2032 CR 2032 BATTERY CR-2032 EXP: 12/2018 $59.99 |
|
|
TOTAL MICRO LITHIUM ION BATTERY FOR LENOVO NOTEBOOKS – BRAND NEW IN OPEN BOX $49.99 |
|
|
100pcs. NEW, CR1216 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $49.99 |
|
|
Hitachi WH10DL 10.8-volt Lithium-Ion Micro Driver Drill $39.99 |
|
|
Surefire 24-pack 123A Lithium Batteries Plus Micro Light Ultra Bright White LED $49.95 |
|
|
HOT ! Dwarf Speaker Powerful 5W,Micro SD Card Reader , build lithium battery $47.26 |
|
|
Milwaukee 48-11-2401 M12 12v lithium ion micro battery $46.98 |
|
|
Dwarf Vibration Speaker by Cowin Electronics, lithium battery Micro SD Slot $34.99 |
|
|
Dwarf Vibration Speaker by Cowin Electronics, lithium battery Micro SD slot $34.99 |
|
|
Dwarf Vibration Speaker by Cowin Electronics, lithium battery Micro SD slot $34.99 |
|
|
Total Micro POWERSTATION200 16V DC Lithium-Ion Notebook Battery $41.31 |
|
|
50pcs. NEW, CR1225 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $35.99 |
|
|
50pcs. NEW, CR927 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $35.99 |
|
|
100pcs. NEW, CR1220 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $29.99 |
|
|
New – Total Micro Powerstation 200 16V DC Lithium-Ion Notebook Battery $25.00 |
|
|
100 MAXELL CR2032 MICRO LITHIUM BATTERIES $34.99 |
|
|
50pcs. NEW, CR1216 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $29.99 |
|
|
50 PCS MAXELL 3V MICRO LITHIUM CELL CR2025 CR 2025 BATTERY CR-2025 EXP: 12/2017 $33.99 |
|
|
50 PCS MAXELL 3V MICRO LITHIUM CELL CR2016 CR 2016 BATTERY CR-2016 EXP: 12/2018 $33.99 |
|
|
50 PCS MAXELL 3V MICRO LITHIUM CELL CR2032 CR 2032 BATTERY CR-2032 EXP: 12/2018 $33.99 |
|
|
Total Micro POWERSTATION200 16V DC Lithium-Ion Notebook Battery $31.78 |
|
|
Total Micro 312-0873-TM Lithium-ion Notebook Battery – 7650 mAh – Silver $30.99 |
|
|
50pcs. NEW, CR1620 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $24.99 |
|
|
50pcs. NEW, CR2430 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $24.99 |
|
|
50pcs. NEW, CR1632 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $24.99 |
|
|
Total Micro PowerStation 200 Notebook battery – Lithium ion $16.09 |
|
|
Total Micro 43R9255-TM 9-Cell Lithium-ion Notebook Battery for Lenovo ThinkPad $29.06 |
|
|
40 PCS MAXELL 3V MICRO LITHIUM CELL CR2025 CR 2025 BATTERY CR-2025 EXP: 12/2017 $28.99 |
|
|
40 PCS MAXELL 3V MICRO LITHIUM CELL CR2016 CR 2016 BATTERY CR-2016 EXP: 12/2018 $28.99 |
|
|
40 PCS MAXELL 3V MICRO LITHIUM CELL CR2032 CR 2032 BATTERY CR-2032 EXP: 12/2018 $28.99 |
|
|
25pcs. NEW, CR1225 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $24.99 |
|
|
50pcs. NEW, CR1616 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $22.99 |
|
|
MICRO LITHIUM CELL WATCH BATTERIES 50PCS.CR2330 3V $19.99 |
|
|
50pcs. NEW, CR1220 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $19.99 |
|
|
Total Micro POWERSTATION-200 200 Lithium Ion 9.5Ah Battery $24.16 |
|
|
30 PCS MAXELL 3V MICRO LITHIUM CELL CR2025 CR 2025 BATTERY CR-2025 EXP: 12/2017 $23.99 |
|
|
30 PCS MAXELL 3V MICRO LITHIUM CELL CR2032 CR 2032 BATTERY CR-2032 EXP: 12/2018 $23.99 |
|
|
30 PCS MAXELL 3V MICRO LITHIUM CELL CR2016 CR 2016 BATTERY CR-2016 EXP: 12/2018 $23.99 |
|
|
MICRO LITHIUM CELL WATCH BATTERIES 25PCS.CR2330 3V $19.99 |
|
|
25pcs. NEW, CR927 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $18.99 |
|
|
5X Micro LED Head Light 20hours with 2x CR20323V Lithium FREE SHIPPING $20.00 |
|
|
25pcs. NEW, CR1216 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $15.99 |
|
|
Wahl 5640-1001 Lithium Micro Groosman Personalperp Trimmer $11.92 |
|
|
Energizer Lithium Energi To Go Multi-Tipped Portable Charger Micro USB More LOOK $13.95 |
|
|
20 PCS MAXELL 3V MICRO LITHIUM CELL CR2025 CR 2025 BATTERY CR-2025 EXP: 12/2017 $18.99 |
|
|
20 PCS MAXELL 3V MICRO LITHIUM CELL CR2016 CR 2016 BATTERY CR-2016 EXP: 12/2018 $18.99 |
|
|
20 PCS MAXELL 3V MICRO LITHIUM CELL CR2032 CR 2032 BATTERY CR-2032 EXP: 12/2018 $18.99 |
|
|
25pcs. NEW, CR2430 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $14.99 |
|
|
ZTE Warp, N860, 1500 Mah Lithium-ion Battery+Free Micro USB Charger $16.99 |
|
|
25pcs. NEW, CR1220 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $11.99 |
|
|
New in package Powertron Micro Lithium Cell 3V $14.99 |
|
|
10 PCS MAXELL 3V MICRO LITHIUM CELL CR2025 CR 2025 BATTERY CR-2025 EXP: 12/2017 $13.99 |
|
|
10 PCS MAXELL 3V MICRO LITHIUM CELL CR2016 CR 2016 BATTERY CR-2016 EXP: 12/2018 $13.99 |
|
|
10 PCS MAXELL 3V MICRO LITHIUM CELL CR2032 CR 2032 BATTERY CR-2032 EXP: 12/2018 $13.99 |
|
|
Motorola Droid 3, XT862, 1600Mah Lithium-Ion Battery + free Micro USB Charger $12.99 |
|
|
ZTE SCORE, X500, 1000 Mah, Lithium-Ion Battery + Free Micro USB Charger $12.99 |
|
|
MICRO LITHIUM CELL WATCH BATTERIES 10PCS.CR2330 3V $9.99 |
|
|
10pcs. NEW, CR1216 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $9.99 |
|
|
Energi to Go – Mini and Micro USB – Lithium batteries for Cellphone $11.99 |
|
|
10pcs. NEW, CR1220 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $8.99 |
|
|
10pcs. NEW, CR927 WAMA MICRO LITHIUM CELL WATCH BATTERIES 3V $8.99 |
