90 Chapter 4
Troubleshooting the RF Section (E4446A, E4447A, E4448A)
What You Will Find in This Chapter
What You Will Find in This Chapter
The following information is found in this chapter:
1. Theory of operation of the RF section for model numbers E4446A,
E4447A, and E4448A.
2. Isolating the cause of an hardware problem by verifying the
functionality of assemblies in the RF section signal path.
3. Block diagrams of the RF section of the analyzer.
NOTE Each section describes how the assembly works and gives information to
help you troubleshoot the assembly. Each description covers the purpose
of the assembly, describes the main components, and lists external
connections to the assembly.
This following descriptions are found in this chapter:
• RF Section Description (E4446A, E4447A, E4448A) .............page 91
• Overall Front End ....................................................................page 95
• A14 and A15 Step Attenuators ................................................page 96
• A21 FELOMA and A29 FELOMA/SBTX Driver ....................page 98
• A19 SBTX/RYTHM Assembly ...............................................page 101
• A18 YTO .................................................................................page 103
• A20 Lowband ..........................................................................page 104
• A13 Front End Driver ............................................................page 107
• A22 Low Band Preamplifier (Option 1DS) ...........................page 108
• A27 Electronic Attenuator Description (Option B7J) ..........page 109
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