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General| Frequency Range | 144-148 MHz |
|---|---|
| Power Supply | 13.8 V DC |
| Voltage | 13.8 VDC |
| Type | Transceiver |
| Sensitivity | 0.25 μV |
| Receiver Sensitivity | 0.25 µV |
| IF Rejection | 70 dB |
| Image Rejection | 70 dB |
Explains the PLL synthesizer system and frequency configuration of the TR-751A/E.
Details the general receiver system, SSB circuit, and FM circuit operation.
Discusses receiver front-end performance, sensitivity, and AGC characteristics.
Describes the noise-operated SSB squelch circuit and its sensitivity.
Outlines the transmitter system operation, SSB, and FM modes.
Explains the CW circuit, keying waveform, semi break-in, and side tone.
Details the ALC detection and SWR protection circuits for output power control.
Describes the PLL system block diagram, digital VFO, and frequency generation.
Explains the control unit structure, MPUs, interface circuits, and input/switching circuits.
Covers MPU interfaces for data exchange and the reset backup circuit for power stability.
Describes input circuits for front panel keys, switches, and encoders using key scan techniques.
Details mode switching, standby circuits, and various other I/O functions like busy input and squelch.
Lists and describes the functions of elements in the final unit (X45-1490-11).
Lists and describes the functions of elements in the control unit (X53-1460-XX).
Lists components for LCD, DC-DC, AF Preamp, Squelch Switch, and MIC AMP units.
Provides specifications for capacitors and resistors, including types and values.
Lists various semiconductor devices like diodes, transistors, ICs, and FETs.
Lists general parts, cabinets, panels, and components for the control unit.
Lists necessary test equipment and outlines preparation steps before adjustments.
Guides common adjustments for TX-RX sections and the PLL system.
Details adjustments for receiver and transmitter systems, including sensitivity and drive output.
Covers adjustments for receiver sensitivity and S meter calibration in FM and SSB modes.
Guides adjustments for noise blanker, SSB squelch, and open channel search functions.
Details adjustments for transmit output, RF meter, low power, and protection circuits.
Covers adjustments for FM deviation, side tone, CW break-in, and beep functions.
Guides adjustments for carrier point, carrier suppression, and spurious signal minimization.
Outlines microprocessor operation checks and memory entry/recall procedures.
Shows component and foil side views for the Composite Unit RX board.
Displays component and foil side views for the Control Unit board.
Shows component side views for Sub VCO, Squelch Switch, MIC AMP, CW Break-in, DC-DC, AF Preamp units.
Shows component and foil side views for the Final Unit board.
Shows foil side views for the Composite Unit RX board.
Shows component and foil sides for the Composite Unit RX board.
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