Xicom XTU-400K, Operation And Installation Manual

Page: 185 / 189

MNC-0000-015 4 of 8 Revision C
Operation Addendum, Block Upconverter
Functional Description
The block diagram in Figure 3 provides a schematic for the BUC.
Table 1 presents a frequency plan for the output of the BUC.
The input of the BUC provides diplexing to direct the reference
frequency to the LO Synthesizer and IF frequency to the mixer. The
synthesizer generates the LO frequency from the reference
frequency and filters it to eliminate unwanted harmonics. The LO is
amplified and passed to the LO port of the mixer. The IF frequency
is filtered to eliminate unwanted harmonics and amplified to the
desired gain level of the BUC and passed to the IF port of the
mixer. The mixer generates the mixing products from the
combination of the IF and LO frequencies.
Figure 2, Reference Frequency Phase Noise Chart