Harmonic ProView 2900 Installation Manual page 91

Chapter 6: Receiver Configuration Modules
LNB Power Supply
6.2.1.5.
The ProView 2900 sets the polarization of the receiving antenna by providing different
voltage levels to the satellite Low Noise Block (LNB), 13v for vertical polarization and 18v for
horizontal polarization.
The polarization of the receiving antenna is determined according to the polarity of the
satellite transponder. The following figure illustrates the LBN Power Supply screen.
1 1 1 1
2 2 2 2
3 3 3 3
The available options are:
OFF - No voltage is supplied to the LNB. Use this option either when cascading IRDs
•
using the loop-through connector on the L-Band interface or when this voltage is supplied
to the LNB by external source.
13V (VERTICAL) – Vertical polarization
•
18V (HORIZONTAL) – Horizontal polarization
•
LNB 22 KHz
6.2.1.6.
The receiver controls the LNB band by sending a 22 kHz signal. When the signal is sent, the
LNB uses its High Band Local Oscillator (L.O.). When the signal is not sent, the LNB uses its
Low Band L.O.
The local oscillator is used to convert the signal from Ku-Band or C-Band to L-Band. Two
local oscillators exist one for each band to leverage full spectrum. The following figure
illustrates the LNB 22KHz screen.
1 1 1 1
2 2 2 2
The available options are:
The available options are:
OFF (Low Band) – the 22 kHz signal is not generated and low band reception is
•
selected.
ON (High Band) - the 22 kHz signal is generated and high band reception is selected.
•
© Harmonic Inc. Manual p/n 101543/Ver 1.0
LNB Power Supply LNB Power Supply LNB Power Supply LNB Power Supply
13V (VERTICAL) 13V (VERTICAL)
13V (VERTICAL) 13V (VERTICAL)
18V (HORIZONTAL) 18V (HORIZONTA L)
18V (HORIZONTA 18V (HORIZONTA L) L)
OFF OFF
OFF OFF
LNB 22 KHz LNB 22 KHz
LNB 22 KHz LNB 22 KHz
OFF (Low Band) OFF (Low Band) OFF (Low Band) OFF (Low Band)
ON (High Band) ON (High Band) ON (High Band) ON (High Band)
Satellite Receiver Configuration
6-6 ProView 2900 Series/SW Version 1.94