Analog Communications Trainer

Technical Specification:
This trainer must have the following theoretical and technical features and experiments facilities:
This comprehensive training system should be designed to analyze the DSB/SSB techniques used for Amplitude Modulation. The trainer consists of signal generator and Modulator section. It shall provide the full understanding of conventional Amplitude Modulation circuits.
The training system should also be designed to give the student a deep understanding of recovery techniques of Amplitude Modulation signal.
Receiver is designed similar to that of a commercial Radio Receiver. It demonstrates Super heterodyne Receiver with Automatic gain control (AGC) technique to demodulate the received AM DSB signal. AM SSB signal is received using product detector.
The trainer should also be designed to analyze the techniques of Frequency Modulation & Demodulation using analog signals.
This comprehensive training system should consist of the following trainers and accessories:
AM DSB/SSB Transmitter Trainer
AM DSB/SSB Receiver Trainer
Frequency Modulation/Demodulation Trainer
Power Supply
Experiment Manual
Patch cords and
Power Cord
Technical Features:
AM DSB/SSB Transmitter Trainer:
1. Micro phone Input: Input through micro
phone
2. Audio Generator: Frequency and
Amplitude adjustable.
3. Modulator: Balanced Modulator for AM-
DSB and AM-SSB
4. Local Oscillator: 455 Khz
5. SSB Filter: 450KHz Ceramic Bandpass
Filter
6. Carrier Frequency: Adjustable 1 MHz
oscillator
7. Transmitter: RF amplifier with antenna
8. Audio Amplifier: Monolithic with
9. adjustable gain
10. Speaker: 8 Ohm
11. Interconnections: 2mm gold plated pins
AM DSB/SSB Receiver Trainer:
1. Type: Super Heterodyne AM Receiver
2. Frequency Range: 955 KHz to 2055 KHz
3. Antenna: Standard AM antenna
4. On Board Devices:
o RF Amplifier
o Mixer
o Local Oscillator
o Beat Frequency Oscillator
o IF Amplifier 1
o IF Amplifier 2
5. Detectors:
o Super Heterodyne AM Receiver (DSB)
o Product Detector (SSB)
6. Local Oscillator: 455 KHz
7. Audio Amplifier: Integrated amplifier
with volume control and speaker
8. Low Pass Filter: 5 Order Butterworth with cut off at 3.4KHz
9. Speaker: 8 Ohm
10. Interconnections: 2mm gold plated pins
Frequency Modulation/Demodulation Trainer:
1. Audio Generator: Frequency and Amplitude adjustable.
2. FM Modulator Types: Reactance Modulator, Varactor Modulator
3. FM Demodulator Types:
Detuned Resonant
Quadrature Detector
Foster ?Seeley
Ratio ? Detector
Phase Locked Loop
4. Low Pass Filter: 3.4 KHz Cut off Frequency
5. Amplifier: AC Amplifier with adjustable gain
6. Inter-connections: 2 mm gold plated pins
Following experiments must be carried out with this trainer:
AM DSB/SSB Transmitter Trainer:
Understanding of AM DSB/SSB Transmitter
AM DSB Modulation
AM SSB-SC Modulation
AM DSB-SC Modulation
Transmission of AM DSB-SC Modulated
AM DSB/SSB Receiver Trainer:
Audio Amplifier
Static Measurements
Dynamic Measurements
AM detector and AGC Stage
Static Measurements
Dynamic Measurements
Second AM IF Amplifier
Static Measurements
Dynamic Measurements
First AM IF Amplifier
Static Measurements
Dynamic Measurements
AM Mixer, AM Oscillator and AM Antenna
Static Measurements
Dynamic Measurements
AM Alignment with Test Equipment
Demodulation of AM SSB-SC
Frequency Modulation/Demodulation Trainer:
Study Frequency Modulation using Varactor Modulator
Study Frequency Modulation using Reactance Modulator
Study Operation of Detuned Resonant Circuit
Study Operation of Quadrature Detector
Study Operation of Phase-Locked Loop Detector
Study Operation of Foster ? Seeley Detector
Study Operation of Ratio Detector