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Trio JR-500S - User Manual

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Summary

Special Features

Superior Stability

Achieved via crystal controlled first local oscillator and VFO type 2nd oscillator.

Circuit Theory

RF Amplification

Selects and amplifies weak radio signals, improves S/N and image rejection.

2 nd Mixer and VFO

Converts 1st IF to 455 kHz; features a stable, transistorized VFO with output terminals.

AVC Circuit

Provides automatic gain control using rectified IF output as negative bias.

Controls and Their Functions

FUNCTION Switch

Controls receiver modes (OFF, SSB-CW, STAND BY, AM, AM-ANL).

AF GAIN Control

Adjusts the audio output volume level.

RF GAIN Control

Controls receiver sensitivity, used for overload situations.

TUNING Knob

Main tuning knob for selecting frequencies, with 1 kHz precision.

Operating Instructions

Receiving Procedure

Steps for setting FUNCTION, BAND, RF GAIN, AF GAIN, PRE SELECTOR, and TUNING for reception.

Summary

Special Features

Superior Stability

Achieved via crystal controlled first local oscillator and VFO type 2nd oscillator.

Circuit Theory

RF Amplification

Selects and amplifies weak radio signals, improves S/N and image rejection.

2 nd Mixer and VFO

Converts 1st IF to 455 kHz; features a stable, transistorized VFO with output terminals.

AVC Circuit

Provides automatic gain control using rectified IF output as negative bias.

Controls and Their Functions

FUNCTION Switch

Controls receiver modes (OFF, SSB-CW, STAND BY, AM, AM-ANL).

AF GAIN Control

Adjusts the audio output volume level.

RF GAIN Control

Controls receiver sensitivity, used for overload situations.

TUNING Knob

Main tuning knob for selecting frequencies, with 1 kHz precision.

Operating Instructions

Receiving Procedure

Steps for setting FUNCTION, BAND, RF GAIN, AF GAIN, PRE SELECTOR, and TUNING for reception.

Trio JR-500S Specifications

General IconGeneral
BrandTrio
ModelJR-500S
CategoryReceiver
LanguageEnglish

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