Frequency Modulation and Demodulation Trainer

Product Code: JL--1496

Frequency Modulation and Demodulation Trainer

FM Transmitter and Receiver Trainer has been designed with a view to provide practical and experimental knowledge of Frequency Modulation & Demodulation Trainer technique as practically implemented in Analog Communication system on a SINGLE P.C.B. of size 300 x 400 mm.

Object: To Study Theory of Frequency Modulation & Demodulation:
Frequency Modulation via varactor / reactance Modulation

Frequency Demodulation via Detuned Resonant/Ratio/Quadrature/Foster - Seeley/Phase locked loop detector

Separate VCO circuit to demonstrate FM waveform


The board consists of the following built-in parts:
POWER SUPPLY : ± 12DC IC Regulated power supply

FM Modulating signal generator : Sine wave

Frequency Range : 300 Hz to 3.4 Khz

Amplitude Range : 0 to 5 Vpp.

Modulator Type : Varactor modulator (With carrier frequency adjustment) : Reactance Modulator (With carrier frequency adjustment)

Demodulator (Detuned resonant detector) : 
Quadrature detector

Foster - Seeley Detector

Ratio Detector

Phase locked loop Detector

Mixer/Amplifier : 1 No. (With gain adjustment) Allows FM input signal to be amplitude modulated by a noise input to demodulation.

Low pass Filter : 3.4 KHz. Cut of frequency Amplifier (with adjustable gain)

VCO Circuit : FM Wave form demonstrate

Test Point : 78

Power supply requirement : 230V AC, 50 Hz.

On Board Switched Faults : 8 Nos.

On Board Amplitude limiter with Amplitude control.

Input - Output and Test points provided on board.

A self contained Trainer.

Effect of noise on the detection of FM signal may be investigated.

Good Quality, reliable terminal/sockets are provided at appropriate places on panel for connections/ observation of waveforms.

Strongly supported by detailed Operating Instructions, giving details of Object, Theory, Design procedures, Report Suggestions and Book References.

Weight : 6 Kg. (Approx.)

Dimension : W 412 x H 150 x D 310

Other Apparatus Required:
Cathode Ray Oscilloscope 20MHz.

Patch Cords



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