Terrasat IBUC 2, Operation Manual

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3-22
|
Cyber Hardened IBUC
2
, IBUC
2e
, IBUC
2 G
, IBUC
R
, IBUC
G
Operations Manual: Installation
Engineered to Endure
2. Use the level adjust mechanism of the modem or converter to increase or decrease
the power level. Adjust to reach a level of –30 dBm. (All IBUC units are designed
to reach rated power at P1dB over frequency and temperature with - 30 dBm at the
input when the attenuator is set to minimum attenuation.) For some modems and
shorter cable runs, it is not possible to reach –30 dBm. In this case, the attenuator
in the IBUC may be used instead.
3. Check that the 10 MHz reference signal is present and within the range of +5 dBm
though –12 dBm.
Note:
The Cyber Hardened IBUC
2
, IBUC
2e
, IBUC
2 G
, IBUC
R
and IBUC
G
require
a 10 MHz reference signal to operate. Check the model number of your IBUC to
determine whether an external 10 MHz signal is required.
4. 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,
1. Connect a waveguide - to - coaxial adapter and a 40 dB high - power attenuator to the
IBUC waveguide output.
2. Ensure that DC power to the IBUC is applied in the proper voltage range.
(Depending on your setup, this could be through the coaxial cable or through the
J3 connector.)
3. Connect the Tx L - band input signal to the Tx L - band connector J1 on the IBUC.
4. Enable the Tx signals in the modem or converter and the IBUC.
5. Measure the RF output with a power meter connected to the attenuator attached at
the waveguide output. For accuracy, measure pure carrier (that is, continuous wave
or CW) and the frequency allotted to you by the satellite network operations center
(NOC).
6. If the modem still has available range, use the level adjust mechanism to reach the
designated power level. If there is no available range, use the attenuation setting on
the IBUC instead.
Note:
To set attenuation on IBUC, you first need to establish communication with the
IBUC. For more information about the various M&C interfaces you can use to
establish communication, see Chapter 5, Monitor and Control Features .
7. If using a satellite modem, adjust the RF output to the designated power level
(provided by the satellite network operations center or its engineering staff) with
the L - band output (modem) level adjust mechanism.
8. Disable the Tx signal in the modem or converter.
9. Disconnect the Tx L
- band input signal.
10. Remove the waveguide-to-coaxial adapter and install the transmit waveguide
section to the antenna transmit feed.