Harmonic ProView 2900 Installation Manual page 101

Chapter 6: Receiver Configuration Modules
LNB 22KHz
6.2.2.10.
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:
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.
•
Freq Drift Compensation
6.2.2.11.
The ProView 29000 uses Freq Drift Compensation Feature to automatically correct
inaccurate frequencies inserted by the operator.
When the operator sets the receiver frequency, the ProView 2900 checks whether the
inserted frequency is set to the optimal frequency. When a deviation is detected, the
ProView 2900 calculates the offset from the original setting and enables correcting it.
Turning on the Freq Drift Compensation in the following menu activates the automatic
frequency adjustment. When Drift compensation is turned off, the device uses the original
frequency setting that was inserted by the operator.
The following figure illustrates the Freq Drift Compensation screen.
1 1 1 1
2 2 2 2
The available options are:
OFF – Drift Compensation is off; the receiver remains tuned to the configured frequency.
•
ON - Drift Compensation is on; the receiver tunes to the optimum frequency.
•
© Harmonic Inc. Manual p/n 101543/Ver 1.0
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
Freq Drift Compensation Freq Drift Compensation
Freq Drift Compensation Freq Drift Compensation
OFF OFF OFF OFF
ON ON ON ON
Satellite Receiver Configuration
6-16 ProView 2900 Series/SW Version 1.94