Comtech EF Data Vipersat Load Utility v3.5.x - Manual (Page 82)

Digicast Media Router Remote Commander
4-12 VLoad User Guide
Tuner Settings
Figure 4-14 Tuner Settings box
• LNB Frequency (MHz) – The frequency of the Local Oscillator that
resides in the Low Noise Block amplifier, located at the antenna. Review
the products specification sheet or visit the manufacturer’s web site for
information regarding the capabilities of the Low Noise Block in use.
• Down Frequency (MHz) – The receive frequency being down linked
from the satellite to the Low Noise Block amplifier.
The combination of the LO and the downlink frequency produces the L-
Band frequency expected by the DVB-S2 Media Receiver. To obtain the
L-band frequency, subtract the receive frequency from the LO frequency.
Some examples are shown below:
Example 1
LO = 10,750 MHz
Ku-Band Receive Frequency = 11,895 MHz
L-Band Frequency = 11,895 MHz – 10,750 MHz = 1,145 MHz
Example 2
LO = 10,600 MHz
Ku-Band Receive Frequency = 12,010 MHz
L-Band Frequency = 12,010 MHz – 10,600 MHz = 1,410 MHz
Example 3
LO = 5,150 MHz
C-Band Receive Frequency = 3,920 MHz
L-Band Frequency = 5,150 MHz – 3,920 MHz = 1,230 MHz