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| 型號(hào)： | TA0321 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | TECHNICAL ARTICLE |
| 中文描述： | 技術(shù)文章 |
| 文件頁(yè)數(shù)： | 4/12頁(yè) |
| 文件大?。?/td> | 170K |
| 代理商： | TA0321 |
3 22kHz Tone and DiSEqC (Digital Satellite Equipment Control) Encoding
TA0321
4/12
3
22kHz Tone and DiSEqC (Digital Satellite Equipment
Control) Encoding
In addition to selecting the polarization, the LNB needs to select the operating band. Indeed,
each reception band is divided in two bands:
Low Band (10.7-11.7 GHz)
High Band (11.7-12.75 GHz).
●
●
This is done with the use of a 22kHz tone frequency. A 22 kHz pulse-position modulated signal
of about 0.6 V amplitude is superimposed on the LNB's DC power rail. Its coding scheme also
allows the remote electronics to perform more complex functions. Traditionally, when other
encoding functions do not require the 22 kHz tone, simple presence or absence of this tone
selects the operating band by changing the local oscillator frequency of the LNB.
The complex encoding of the 22 kHz burst is done with a more sophisticated communication
bus protocol named the DiSEqC standard (Digital Satellite Equipment Control). The open
DiSEqC standard developed by the European Telecommunication Satellite Organization is a
well accepted worldwide standard for communication between satellite receivers and satellite
peripheral equipment.
The 22 kHz oscillator has to be a tone generator with specific rise and fall time. The wave
shape will be a quasi-square wave (sine with flat-top). The required frequency tolerance is
±2 kHz over line and temperature variations.
Table 1.
Band and polarization selection table
Parameters
22 kHz Tone
present
22 kHz Tone
absent
Operating band
High
Low
V
DC
13 V
Vertical polarization
Vertical polarization
18 V
Horizontal polarization
Horizontal polarization
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