Download (IBUC) Operation Manual - Satellite Bandwidth by New Era Systems

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Connect the LNB to the demodulator RX input by attaching the coaxial cables from
the RX L-band OUT on the LNB to the demodulator RX L-band input port. When
configured with the IFU, connect the IFU RX OUT (J5) to the demodulator RX Lband input port and connect the LNB to the IFU RX input by attaching the coaxial
cables from the RX L-band OUT on the LNB to the RX input port (J4) on the IFU.
Antenna Alignment
WARNING: WHEN ALIGNING THE ANTENNA, THE IBUC MUST NOT
TRANSMIT.
Ensure that the desired transponder is in operation. To find the satellite and peak the
receive signal, perform the following:
- Apply power to the LNB.
- Sweep the antenna through previously determined azimuth and elevation
adjustments. Note: This must be done very slowly in order to locate the satellite.
- Simultaneously, monitor the RECEIVE signal level at the demodulator. Wideband
signals such as video carriers are easiest to find and should be used when available.
- Tune the antenna and adjust its polarization according to the antenna
manufacturer's instructions until the satellite is found.
TX Power Alignment
Transmit L-band Input Adjustment with Modem or Converter
Warning; DC power may be present on the cable so the use of a DC block is
recommended when performing the following steps.
To set the power level of the modulator output:
- With a spectrum analyzer, measure the power level of the L-band signal at the
output of the coaxial cable that connects to the IBUC at J1 (TX L-band).
- Use the modem or converter level adjust to increase and decrease the power level.
Adjust this for a level of -30 dBm (this will result in rated power at the IBUC output).
For shorter cable runs the attenuator in the IBUC may be used.
- Check that the 10MHz reference signal is between +3 and –12 dBm.
- Disconnect the spectrum analyzer from the coaxial cable.
Transmit RF Output Adjustment with Modem or Converter (70 MHz to L-band)
To adjust the power level of the IBUC transmitter output:
- Connect a waveguide to coax adapter and a 40dB high power attenuator to IBUC TX
waveguide output.
- Connect the TX L-band input signal to J1 (TX L-band) on the IBUC.
- Enable the TX signals in the modem or converter and the IBUC.
- Measure the RF output with the power meter connected at the waveguide output.
For accuracy measure pure carrier.
- With a Satellite modem: Adjust the RF output to the designated power level
(provided by the satellite network operation center, or its engineering staff) with the
L-band output (modem) level adjust.
- Disable the TX signal in the modem or converter.
IBUC Operation Manual
Terrasat Communications Inc.
Rev. A
4-15