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General characteristics of the FS-1550, including frequency range and accuracy.
Details on the FS-1550's transmitter performance, RF output power, and emission.
Specifications for the FS-1550 receiver, covering sensitivity, selectivity, and audio.
Technical specifications for the antenna coupler's input impedance, tuning speed, and power.
List of parts required for maintenance of the FS-1550, with quantities and codes.
Comparison of functional differences between the FS-1550 and FS-1500 models.
Detailed description of the FS-1550 Transceiver Unit's operation and components.
Explanation of the FS-1550 Antenna Coupler Unit's block diagram and function.
Explanation of the functions of various DIP switches for equipment configuration.
Procedure for storing desired frequencies into the FS-1550's memory channels.
Instructions for changing the input voltage settings for power supply units.
List of test equipment required for FS-1550 adjustments and their specifications.
Procedure for checking the input and internal line voltages of the unit.
Checking the frequency and level of the local oscillator outputs.
Steps for calibrating the transmitter's output power and levels.
Procedures for adjusting receiver sensitivity, S-meter, and IF gain.
Methods for verifying the performance and functions of the antenna coupler.
Instructions for performing the self-test facility of the antenna coupler.
Guidelines for replacing key components like final transistors on the PA board.
Steps for disassembling and replacing printed circuit boards within the unit.
Diagrams showing the location of components on the CPU board.
Identification of components and test points on the TX/RX board.
Component locations for PA, TX FIL, RELAY, and SW REG boards.
Diagrams showing parts and test points on the antenna coupler board.
Detailed specifications and manufacturers for integrated circuits used in the unit.
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