|
|
PDF TA0321 Data sheet ( Hoja de datos )
| Número de pieza | TA0321 | |
| Descripción | TECHNICAL ARTICLE | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de TA0321 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
TA0321
TECHNICAL ARTICLE
Lightning protection for LNB supply and control voltage regulator
Introduction
Communication satellites operate within two frequency bands for TV/Broadband service broadcast
signals, C Band and Ku Band. The C Band overall frequency spectrum is 4.0 GHz - 8.0 GHz, while the Ku
Band overall frequency spectrum is 10.7 GHz - 18.4 GHz.
Within these bands each satellite has a specific uplink and downlink frequency allocation.
For example:
■ Ku Band downlink frequency is 10.7 GHz-12.75 GHz and uplink frequency is 17.3 GHz-17.8 GHz.
■ C Band downlink frequency is 3.7 GHz-4.2 GHz and uplink frequency is 5.925 GHz-6.425 GHz
To use the frequencies that are available for satellite broadcast as efficiently as possible, and to
accommodate an additional number of channels within a given frequency band, the transmission signal
can be formatted to be either vertical and horizontal, or circular right-hand and circular left-hand
simultaneously per frequency.
UPLINK
DOWNLINK
January 2006
Rev 1
1/12
www.st.com
12
1 page  
TA0321
3 22kHz Tone and DiSEqC (Digital Satellite Equipment Control) Encoding
3.1 22 kHz Wave shape and details
Carrier frequency
Carrier amplitude
Modulation mark period
Modulation space period
22 kHz ±2 kHz over line and temperature
650 mVpp ±250 mV
500 µs ±100 µs
1 ms ±200 µs
3.2 Modulation method
Figure 3. Modulation scheme
Figure 4. Timing diagram for tone burst control signal
5/12
5 Page 
TA0321
6 Conclusion
6 Conclusion
As explained and demonstrated, all LNB power supplies have to be protected against lightning.
The best in class solution for cost effective and reliable protection are the new LNVTVSx-22xx
devices from STMicroelectronics. All devices are available and are in mass production.
7 Revision history
Date
09-Jan-2006
Revision
1 Initial release.
Changes
11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TA0321.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| TA0321 | TECHNICAL ARTICLE | ST Microelectronics |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |