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The R-4C Receiver is a triple conversion super-heterodyne receiver for amateur radio communications.
Outlines the 5-chapter structure of the manual for operator and service technician convenience.
Procedures for removing the receiver from its carton and checking for damage.
Guidance on placement, ventilation, power requirements, and grounding connections.
Details on connecting the antenna to the receiver's input jack.
Interfaces for external switching, transmitter anti-vox, and transceive injection.
Connections for carrier oscillator, PTO lamp illumination, and audio output.
Powering accessories and installing optional crystal filters.
Adding new tuning ranges using accessory crystals.
Instructions for installing the optional 4-NB Noise Blanker.
Connecting the R-4C with Drake T-4, T-4X, T-4B, T-4XB transmitters.
Using the R-4C as an external receiver with TR-4 or TR-4C transceivers.
Overview of controls and the function switch's roles.
Choosing reception modes and understanding the tuning dial.
Steps to accurately calibrate the main tuning dial.
Detailed explanation of all front panel controls including S Meter, Function, Mode, Tuning, AGC, Notch, Gain, etc.
Using the XTALS, BAND switches and PRESELECTOR for tuning.
Adjusting selectivity with PASSBAND TUNING and controlling audio/RF gain.
Controlling automatic gain, attenuating interference, and monitoring signal strength.
Headphone use, S Meter zero adjustment, and initial control presets.
Step-by-step guides for operating in SSB and CW modes.
Step-by-step guides for operating in AM and RTTY modes.
Activating the noise blanker and using accessory crystals for extended coverage.
Introduction to block diagrams and description of RF amplifier stages.
Explanation of the premixer system and the first mixer stage.
Description of the 5645 kHz IF amplifier and crystal filter.
Operation of the second IF system, detectors, and AGC circuit.
Explanation of the S Meter, audio amplifier, and power supply circuits.
Description of the 100 kHz and 25 kHz crystal calibrator.
Factory service information, contact details, and safety warnings.
Procedures for accessing the chassis and listing required test equipment.
Methods for finding defective tubes and general troubleshooting advice.
Overview of alignment steps and specific adjustments for BFO, IF, and oscillators.
Detailed alignment procedures for various filters and oscillators.
Alignment steps for the receiver's input stages.
Fine-tuning the S Meter reading and calibrating the crystal oscillator.
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