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  Construction

Introduction to Construction

Construction contains a stable frequency AF oscillator and RF oscillator. If consists of modulator, driver and output stages. It its front panel, several controls are managed. A scale is fitted in this panel. This type of instrument can be formed to operate with a.c mains or along with a battery.

RADIO ALIGNMENT AND SERVICING

To align and service a radio receiver, equipments such as

1. Signal generator

2. Multimeter is required.

SIGNAL GENERATOR

 

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It is the method to preserve a receiver in appropriate condition.

INTRODUCTION

Signal generator is an instrument that generates audio frequency and radio frequency signals. Thus signal generator is termed as AF and RF signal generator. It is employed to test audio stages and in the receiver align the RF stage.

CONSTRUCTION

It contains a stable frequency of AF oscillator and RF oscillator. It consists of modulator, driver and output stages. In front panel of it, several controls are arranged. A scale is fitted within this panel. This instrument can be ready to operate with a.c mains or with a battery.

WORKING

Through driver and output stages the radio frequency signal is amplified. Audio signals are amplified through AF amplifiers. To generate modulated output signal, the modular modulates the RF and AF signals.

PANEL CONTROLS

1. ON / OFF SWITCH

On/off switch is employed to operate the generator.

2. MODE SELECTOR

Mode selector is three positioned service control. It is operated to choose the needed carrier, modulated and audio signals.

3. BAND SELECTOR

Band selector is also termed as range selector. It is operated to choose the needed bands in the dial.

4. FREQUENCY SELECTOR

Frequency selector is main control. It operates to choose desired signal frequencies within the dial. It is also termed as tuning control.

5. OUTPUT GAIN CONTROLS

They are divided into AF and RF controls. They are operated to manage the gain of audio and radio frequency signals.

6. OUTPUT TERMINALS

Output terminals (Points) are separated into RF and AF terminals. They are employed to acquire the output signals.

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