Installation
34 Block Up Converter Systems 6700/6900 series User Guide
IF levels
The figures and tables in this section show the single carrier IF
levels required to achieve rated P1dB output power from the
BUC using various types and lengths of IF cables. Your actual
IF levels may be different from those shown if you are
operating with multiple carriers and you require output back
off to control intermodulation product levels.
Examples are provided for short cables (with a 3 dB loss) and
long cables (with a 20 dB loss).
The figures in this section are provided as examples only. You
should determine the loss of your selected cable from its
length and your operating frequency (see Table 10 on
page 33). You can then set the modem IF output level and the
BUC attenuator to achieve the required output power.
As a general principle, you should set the BUC attenuator at
the highest possible attenuation setting given the available
modem IF output power and the cable loss. This reduces the
susceptibility of the system to external interference.
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