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VVJ-8718-19/FE HF RECEIVER
CIRCUIT DESCRIPTION
SECTION III
CIRCUIT DESCRIPTION
3.1
INTRODUCTION
This section describes the theory of operation of the receiver.
A
receiver simplified block diagram is provided to show overall functional partitioning of
the receiver.
Functional block diagrams are provided for each of the receiver's major
sections to show functional signal flow through the receiver.
The functional
descriptions are followed by individual circuit descriptions of each receiver module.
3.2
GENERAL DESCRIPTION
Figure 3-1 is a simplified block diagram of the receiver.
The receive
functions have been grouped into the following seven sections:
1.
Input RF Switching Section
2.
Frequency Extender Section
3.
RF/IF Conversion Section
4.
IF/Demodulator Section
5.
Synthesizer Section
6.
Digital Control Section
7.
Power Supply Section
A general discussion of each of these sections follows.
3.2.1
INPUT RF SWITCHING SECTION
A general discussion of the Input RF Switching Section functions and
signal interfaces is provided in the following paragraphs.
3.2.1.1
Input RF Switching Functions
The Input RF Switching Section performs the following functions:
a.
Signal Routing - HF signals (.005 to 29.99999 MHz) signals
are routed directly to the Input Conversion Section and VHF
signals (30 to 100 MHz) are routed through the Frequency
Extender Section to the Input Conversion Section.
b.
Band Limiting - Signal output from the Input Switching
Section to the Input Conversion Section are bandlimited to 30
MHz maximum.
3-1
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