Sea Tel 5012-91, Руководство по установке, Страница: 53 / 138

Setup – Tracking Receiver – VSAT 5012-91 Installation Manual
7-1
7. Setup – Tracking Receiver – VSAT
If your system is using OpenAMIP these parameters will be set by the modem for the satellite/beam that the modem is using
(this also allows for automatic beam switching to be controlled from the model, remotely controlled from the network).
Follow the instructions below to manually set these parameters. .
7.1. 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
Enter the entire six digits of the “megahertz and
kilohertz” is simply entered as one value. This is done in
the Position Antenna screen.
7.2. 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.
Use Polang to peak the polarity.