Frequency Modulation

Frequency Modulation .
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

• 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)

• 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

• Cathode Ray Oscilloscope 20MHz.
• Patch Cords