Start-up Checklist | 4-3
When the Tx Output is set to Disabled, the Tx Output level displayed from com-
mand TPO reads -99.0 dBm. This is not the actual reading. See page C-42 for fur-
ther description.
When conditions cause the automatic shut-off of the Tx Output signal, the Tx
Output is muted and the Tx Output level displayed from command TPO reads
-96.0 dBm. This is not the actual reading.
3. Configure the Power Monitor Frequency to set at which frequency you are
operating. Use the TFR command described on page C-39. The factory default
values in Table C.6 on page C-40 are listed according to the model number of the
IBUC.
Note:
To ensure accurate readings, you must set the actual operating frequency.
Example: If, according to your Satellite NOC, your allocated frequency is
6400 MHz, set the Power Monitor Frequency to 6400 MHz. Do not use the factory
default value unless that is your actual operating frequency.
Note:
It is critical to the operation of the IBUC that TFR be set correctly. The configured
frequency increases the accuracy of input and output power readings. The
attenuator requires the TFR frequency to ensure accurate values are applied when
using the TPT command. See page C-43 for detailed operation of TPT command.
4. Set the Power Read Mode via TPM command. Options include:
• Burst
• Continuous Wave
See page C-42 for further description.
5. Set the Gain Mode via TGC on page C-40. Options include:
• Open
Open is the gain obtained when there is no feedback in the measuring loop.
• AGC (Automatic Gain Control)
The IBUC continuously monitors input and output levels. When AGC is
enabled, the gain of the system is maintained at a constant level by an internal
algorithm. Gain is the difference between output power and input power.
• ALC (Automatic Level Control)
Similar to the AGC system, when ALC is enabled the gain is adjusted when
changes are detected in order to maintain a constant output level.
Note:
The IBUC has an internal temperature compensation feature that minimizes gain
variations due to to changes in temperature. This feature is configured at the factory
and requires no user input. For specific information about your particular model
IBUC, see the datasheets in Appendix D, Component Specifications and Reference
Drawings.
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