Operation Manual

SFX SERIES USER’S GUIDE
Rev 2.2 32
Edit Field Description
Modulation Standard Selects the modulation standard as either one of DVB-S or DVB-S2 (if your model of receiver is
equipped with the DVB-S2 capability).
Viterbi Rate Selects the Viterbi FEC rate of the carrier, using one of the options based on the Modulation
Standard:
DVB-S: Auto, 1/2, 2/3, 3/4, 5/6, 7/8
DVB-S2: Auto
Alpha Factor ????
NCC PID The PID number of the NetManager2 NCC PID (in decimal or hex), in the numeric range 0x20
to 0x1FFE. Specifying 0 disables the NCC PID.
Enable 22kHz Tone Enables or disables the 0.5vpk-pk 22 kHz tone to the LNB. The 22 kHz tone is used to select
the LO frequency pf a universal LNB. The presence of the 22kHz tone switches the universal
LNB to “hi band” (10.6 GHz); the absence switches the LNB to “lo band” (9.75 GHz).
Polarization Selects the polarization of the LNB by setting the output DC voltage from the receiver to the
LNB using one of the options: h for horizontal (18VDC standard or 15 VDC optional) and v for
vertical (13VDC standard or 11 VDC optional).
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 2- 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. This is then displayed on the metrics area at the bottom of the
screen and the LNB Attributes page, when you refresh. During carrier lock, the receiver is tuned to the set frequency
plus this LNB offset. This LNB Offset can be reset to 0.0.
Aside from the Common Menu Items, the following menu items are available:
Menu Item Description
Show Attributes Selecting this button will always return you back to the LNB Attributes page, as shown in
Figure 2- 7. The current LNB offset value in kHz is displayed, as calculated by the receiver as
it compensates for LNB drift.
Edit Selecting this button will enter the Edit LNB Attributes page, as shown in Figure 2- 8.
Reset LNB Offset This will reset the receiver’s internal LNB drift tracking offset frequency back to 0.0 kHz.