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PK-232 TECHNICAL MANUAL
3.1
System Diagrams
Please refer to APPENDIX C for the various diagrams used as reference in this chapter.
3.1.1
Block Diagrams
Refer to the Functional Block Diagram, Figure 1 in APPENDIX C. Dashed lines separate the
five sections of the PK-232. Each section will be described separately and is labeled as fol-
lows:
3.1.2
Logic Diagrams
Refer to the Logic Diagram, Figure 2 in APPENDIX C. Figure 2 shows the digital logic por-
tion of the PK-232 which includes:
The major portion of the power distribution section is also shown on this drawing.
3.1.3
Schematic Diagrams
Refer to the Schematic Diagram, Figure 3 in APPENDIX C. Figure 3 shows the analog por-
tion of the PK-232, which includes:
PK232TM Rev. A 5/87
CHAPTER 3 – THEORY OF OPERATION
o
Analog
o
Digital
o
Input/Output (I/O)
o
Display
o
Power Distribution
o
the microprocessor
o
Read Only Memory (ROM)
o
Random Access Memory (RAM)
o
clock and control logic
o
part of the display logic
o
the logic associated with the digital communications between the PK-
232 and the terminal.
o
mode-dependant bandpass filters
o
MARK and SPACE resonators
o
audio frequency discriminator
o
mode-dependant low pass filter
o
comparator circuitry
o
AFSK generator
o
watchdog time
o
transmitter audio driver
o
keying circuitry
o
radio switching
o
tuning indicator circuitry
CHAPTER 3 – THEORY OF OPERATION
3-1
Page 11
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