COBHAM Sea Tel 9711-56 IMA C Band, Installation Manual

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Sea Tel 9711-56 IMA Setup – Tracking Receiver – VSAT
8-1
EAR Controlled - ECCN EAR99
8. Setup – Tracking Receiver – VSAT
8.1. Determining the IF Tracking Frequency (MHz)
The IF Tracking frequency parameter is a value entered into the MXP MHZ Sub-Menu. The value itself may be
provided by your air-time provider and the MHz value will be entered directly in this sub-menu.
Or, the RF downlink frequency of a specific carrier on the desired satellite can be obtained from a satellite
website and calculated by using the formula RF- LO = IF. When you take the Satellite Transponder Downlink
RF value and subtract the LNB’s Local Oscillator (LO) Value, the resultant value will equal the Intermediate
Frequency (IF). It is this IF value that will be entered into the MXP for tracking purposes. The MHz and KHz
are entered as a single value.
Example: Assuming an LNB LO value of 11.25GHz: We want to track a satellite downlink carrier at 12268.250
MHz.
12268.250 MHz – 11250.000 MHz = 1018.250 MHz IF
1. Enter the entire six digits of the
“megahertz and kilohertz” is simply
entered as one value. This is done in the
Position Antenna screen.
8.2. SAT SKEW
SKEW is used to optimize the polarization of the feed to the desired satellite signal. It is entered when a
known satellite is skewed.
1. Use Skew to peak the polarity.