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Chapter 3. Theory of Operation
3.1
Modem Hardware
The modem is based on a two printed circuit card (minimum configuration) design with
additional optioned printed circuit cards available for additional features. The minimum
configuration consists of an L-Band/IF Assembly and a Digital Baseband Assembly. The
optional printed circuit cards include a Turbo Codec printed circuit card and one of several types
of Interface printed circuit card (refer to Appendix A). A block diagram of the DMD50 is shown
in Figure 3-1.
3.1.1 L-Band/IF Printed Circuit Card
The L-Band/IF Printed Circuit Card consists of an analog modulation function, an analog
complex downconversion, and two wide-band digital synthesizers. The block diagram of the L-
Band/IF Assembly is shown in Figure 3-2.
MN-DMD50– Revision 3
Figure 3-1. Block Diagram
3–1
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Troubleshooting
