Terrasat IBUC 2, Operation Manual

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General Requirements
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3-21
Engineered to Endure
Setting the Tx and Rx Frequencies
All transmit and receive frequencies are set in the modem.
If using a direct connection to an L - band modem, follow the manufacturer’s
instructions for setting the transmit and receive frequencies.
Receive L - band Output Measurements
To check the receiver,
1. Ensure that 15 VDC to 24 VDC (LNB Bias) is present at the modem input.
2. Use a spectrum analyzer to ensure that the 10 MHz reference signal is present at
the modem.
3. Connect the LNB to the demodulator’s Rx input by attaching the coaxial cables
from the Rx L - band output on the LNB to the demodulator’s Rx L - band input port.
Transmit Power Alignment
Transmit L - band Input Adjustment with Modem or Converter
To set the power level of the modulator output,
1. Use a spectrum analyzer to measure the power level of the L - band signal at the
output of the coaxial cable that connects to the IBUC at the Tx L - band connector
J1.
!
WARNING
DC power will be present on the cable. Terrasat recommends the use of a
DC block when using a spectrum analyzer.
!
WARNING
DC power might be present on the cable. Terrasat recommends the use
of a DC block when using a spectrum analyzer.