Hyundai HSS-730, Service Manual

Page: 11 / 56

HSS-730/830 & UFD505/515 SERVICE MANUAL HDT DVB SATELLITE STB
Page 11
The following figure is an example of universal LNB.
3.3.3. LNB Switching Control
As shown in the below figure, the STB supports the following LNB switching methods
DiSEqC 1.2 (including the SMATV mode) Compliant (over DiSEqC 1.2 in future).
The switching type controlled by 14/18V DC.
The switching type controlled by 22kHz Tone.
The STB can Generates a DiSEqC command by modulating the 22kHz signal.
10.70 ~ 11.70 GHz
and
11.70 ~ 12.75 GHz
LO
LO
Hor
Ver
RF Amp
14/18V
Switch
RF Amp
9.75 GHz
10.60 GHz
IF Amp
0/22kHz
Switch
Polarization Selection
High/Low Band
Selection
STB
Satellite Dish