Lnb Attributes; The Lnb Offset - International Datacasting SuperFlex SRA2100 Series User Manual

LNB Attributes

This submenu allows you to set the parameters for controlling the LNB. All LNB attributes
are common to both DVB Carriers. The LNB Attributes page similar to Figure 4-7 will be
displayed when the LNB Attributes submenu item is selected. The meaning of each
attribute is explained under the Edit LNB Attributes page.

(The LNB Offset)

On the LNB Attributes page, the LNB offset is updated to the current value whenever the
page is updated (either through menu selection or browser refresh). The LNB Offset that is
displayed is the stored frequency offset in kHz between the frequency set by the user (in the
DVB Carrier Definitions) and the actual frequency that the receiver is locked to. Every 10
seconds, the receiver calculates the difference between the set frequency and the
frequency being used by the RF front-end demodulator when it acquired lock. If the
difference is greater than five percent of the symbol rate, this difference is added to the
accumulated drift. If the accumulated drift is greater than 1.5 MHz (1500 kHz), it is stored
as a positive or negative LNB Offset, which is then displayed on the GUI on both the metrics
area at the bottom of the screen, and the LNB Attributes page on refresh. On startup or
during carrier lock, the receiver is tuned at the set frequency plus this LNB offset. This LNB
Offset can be reset to 0.0.
NOTE:
The LNB Offset is
not automatically
updated on the
LNB Attributes
page. You must
use the refresh
button on your
browser to update
the LNB Offset.
S R A / S F X 2 1 0 0
Figure 4-7 LNB Attributes Page
S E R I E S S A T E L L I T E R E C E I V E R
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