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) :
Foster - Seeley 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.