Need help?Do you have a question about the Eddystone 990R and is the answer not in the manual?
General technical specifications and characteristics of the receiver.
List of transistors used and their functions within the circuit.
Details the radio frequency amplifier, mixer, and local oscillator circuits.
Explains the operation of the receiver's local oscillator systems.
Describes the intermediate frequency stages, filters, and AGC system.
Covers automatic and manual gain control mechanisms for RF and IF stages.
Details the audio output stages, including low-level and high-level channels.
Overview of the receiver's power supply design and AC/DC operation.
Information on fuses, protection devices, and power supply connections.
Describes the receiver's construction, suitability for mounting, and dimensions.
Details the placement and arrangement of internal circuit boards and components.
Lists optional accessories and associated equipment available for the receiver.
Provides instructions for converting the receiver for rack-mounting.
Explains how to check and adjust mains voltage transformer tappings.
Details how to connect aerials, power, and other external devices.
Explains the purpose and operation of the receiver's front panel controls.
Describes the primary tuning control and its associated logging scales.
Explains how to select the local oscillator control mode (N, EXT, Crystal).
How to engage the carrier-controlled muting circuit to suppress noise.
Overview of routine maintenance, servicing, and component guarantees.
Instructions for replacing fuses for AC and DC power protection.
Guidance on when and how to perform receiver alignment procedures.
Step-by-step procedure for aligning the AM intermediate frequency channel.
Table of typical voltage readings for troubleshooting circuit faults.
Comprehensive list of components, their values, tolerances, and locations.
List of available spare parts with circuit references and part numbers.
Details of the ancillary IF converter unit for driving a panoramic display.
To Next Page
General