communication trainer
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CommunicationsPulse Amplitude Modulation/Demodulation Trainer
The unit is one of a range of digital communication trainers and provides all necessary inputs and connections for students to study pulse amplitude modulation / demodulation techniques, time division multiplexing and demultiplexing of signals and signal reconstruction.
Experiments:
- Study of pulse amplitude modulation technique
- Study of time division multiplexing and demultiplexing
- Study of PLL as frequency multiplier to generate clock from sync signal
- Study of effect of varying duty cycle of sampling pulse on signal reconstruction
- Study of 3 modes of operation to regenerate original signal
- 3 connections between transmitter and receiver (clock, sync & information)
- 2 connections (sync & information). Clock regenerated at receiver
- 1 connection (information only). Clock and sync derived at receiver
Key Features
- Crystal controlled Clock
- On-board signal generator (Synchronized) DC and Sine
- On-board pulse generator
- Demonstrates sampling and reconstruction as per Nyquist criterion
- 4 Analog input channels (TDM-PAM)
- Four switch selectable sampling frequencies
- Pulse duty cycle selectable
- Generation of clock at receiver by PLL system
- 4th order Butterworth L. P. Filters
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CommunicationsPulse Code Modulation Transmitter Trainer
The 7403 is one of a range of digital communication trainers and provides all necessary inputs and connections for students to study pulse code modulation transmission techniques. A communication link can be established by using model 7404, the pulse code modulation receiver.
Experiments:
- Study of pulse code modulation
- Study of A/D conversion
- Study of control signals and their timing
- Study of time division multiplexing
- Study of synchronization by pseudo random code
- Study of error check codes
- Three modes of operation to regenerate original signal
Key Features
- Functional blocks indicated via on board mimics
- Test points
- Crystal controlled clock
- On-board sine generator (synchronized)
- 2 TDM analog channels
- PCM transmitter
- Fast and slow modes for real time operation and data flow examination
- Error check code options (odd-even parity, hamming code)
- 4 switched faults allow different error check code options
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CommunicationsSatellite Communication Trainer
The Satellite Communication Trainer 7272 provides an in-depth study of a basic satellite communication system. It consists of an Uplink Transmitter, Satellite Link and Downlink Receiver, which can be conveniently placed in the laboratory. The satellite can be placed at an elevated position if required. The satellite transponder receives signals from an Uplink Transmitter and retransmits at different frequencies to a Downlink Receiver. The Uplink and Downlink frequencies are selectable and carry three signals – Video, Audio, Voice and Data simultaneously. Any broadband signal, digital/analogue data or function generator waveforms can be communicated through the Satellite link.
Experiments:
- Understanding the concepts of satellite communication
- Establish a direct communication link between Uplink Transmitter and Down link Receiver using tone signal
- To setup an active satellite link and demonstrate link fail operations
- To establish an audio-video transmission through a Satellite link
- Study base-band analogue signal (voice) in satellite link
- Transmission and reception function generator waveforms through satellite link
- Transmission tone through satellite link
- Establish PC to PC communication using satellite Communication Link
Key Features
- Simultaneous Communication of three different signals at each up-linking frequency
- 2414-2468 MHz PLL microwave operation
- Crystal Control Frequencies
- Communicate Audio, Video, Digital data, PC data, Tone, Voice,
- Function generator waveforms
- Communication of external broadband digital and analogue data and base-band signals
- Choice of different transmitting and receiving frequencies
- Built-in microphone and speaker for Voice and Audio link
- Detachable Dish Antenna at each station
- Facility to attach Analogue/Digital communication kits
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