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  COMMUNICATION TRAINER KIT

ALS-CT-05

8 CHANNEL TIME DIVISION MULTIPLEXING AND DEMULTIPLEXING TRAINER
This kit facilitates the students in learning Pulse Amplitude modulation and de modulation, multiplexing of the sampled signal and reconstruction of the original signal.

FEATURES:

8 Channel multiplexing and demultiplexing.

On board variable Sine Triangle and square wave generators.

Low Pass Filters.

Various test points to observe the process at various stages.

Potentiometers to vary the frequency of the signal sources.

FEATURES:

8 Channel multiplexing and demultiplexing.

On board variable Sine Triangle and square wave generators.

Low Pass Filters.

Various test points to observe the process at various stages.

Potentiometers to vary the frequency of the signal sources.

LIST OF EXPERIMENTS:

To Study 8 channel Multiplexing and Demultiplexing.

To Study address generation and its use in multiplexing and demultiplexing.

To Study Pulse Amplitude Modulation and demodulation.

 

 

ALS-CT-06

AMPLITUDE SHIFT KEYING MODULATION AND DEMODULATION TRAINER
This trainer provides an opportunity to study carrier modulation of digital signals.

There are various carrier modulation techniques required for transmission of digital information. Amplitude Shift Keying (ASK) is one such modulation scheme. Digital signal is represented by a sequence of '0's and '1's. In ASK a carrier frequency is switched On if the data bit is '1' and switched off if the data bit is '0'. This trainer provides a bit pattern generator and carrier signal required to carryout the experiment.

FEATURES:

 

Data pattern generators.

Carrier with variable frequency.

Low Pass Filters.

Various test points to observe the process at various stages.

Potentiometers to vary the frequency of the signal sources.

TECHNICAL SPECIFICATIONS:

 

On-board Data sources: 4 no.s of Data Patterns ranging from
1K Hz to 5 KHz @ 4V pk-pk

Modulation: Amplitude Shift Keying Modulation

On-board carrier frequency Range: 100KHz

Test Points: 7 nos.

Interconnections: 2mm Sockets with patch cords.

Power: External 5V,+12V and -12V

 

 

 

 

LIST OF EXPERIMENTS:

 

To Study Amplitude Shift Keying by connecting various Data patterns available on-board.

To Study Data recovery by using Low pass filters and Data squaring circuit

On-board carrier frequency Range: 100KHz

 
ALS-CT-07
PHASE SHIFT KEYING MODULATION AND DEMODULATION TRAINER

This trainer provides an opportunity to study carrier modulation of digital signals. There are various carrier modulation techniques required for transmission of digital information. Phase Shift Keying (PSK) is one such modulation scheme. Digital signal is represented by a sequence of '0's and '1's. In PSK. Carrier signal which is in-phase or 180 degrees out of phase is switched depending on whether the Input Data is '1' or '0'. This trainer provides a bit pattern generator and carriers with 0 deg. and 180 deg.Phase difference.

FEATURES:

Data pattern generators.

Carriers with variable frequency.

Low Pass Filters.

Wave shaping circuits.

Comparator and Data squaring circuits.

Various test points to observe the process at various stages.

Potentiometers to vary the frequency of the signal sources

TECHNICAL SPECIFICATIONS:

On-board Data sources: 4 no.s of Data Patterns ranging from 500 Hz to 2.5
KHz @ 2.5V pk-pk

Modulation: Phase Shift Keying Modulation

On-board carrier frequency Range: 2 KHz to 10KHz adjustable @ 2.5V pk-pk

Test Points: 7 nos

Interconnections: 2mm Sockets with patch cords.

Power: External 5V,+12V and -12V

LIST OF EXPERIMENTS:

To Study Phase Shift Keying by connecting to various Data patterns available
on-board.

To Study Data recovery by using Wave shaping circuits, filters and Data squaring circuits.

 

 

ALS-CT-08
FREQUENCY SHIFT KEYING MODULATION AND DEMODULATION TRAINER

This trainer provides a facility to study carrier modulation of digital signals. There are various carrier modulation techniques required for transmission of digital information. Frequency Shift Keying (FSK) is one such modulation scheme. Digital signal is represented by a sequence of '0's and '1's. In FSK a carrier signal is switched between two frequencies depending on whether the Data bit is '1' or '0'. This trainer provides a bit pattern and carrier generator.

FEATURES:

Data pattern generators.

Low Pass Filters.

XR2206 is used as FSK modulator. This IC is made to output two different frequencies depending on the state of the Input Data.

LM565 is used as a demodulator.

Filters and Comparator as Data squaring circuits at the output.

Test points to observe the process at various stages.

Potentiometers to vary the frequency of the signal sources.

TECHNICAL SPECIFICATIONS:

On-board Data sources: 4 no.s of Data Patterns ranging from 60 Hz to 300 Hz
@ 4V pk-pk

Carrier frequency: 2124Hz for DATA =1 and 2975Hz for DATA=0

Modulation: Frequency Shift Keying Modulation

Test Points: 14 nos

Interconnections: 2mm Sockets with patch cords.

Power: External 5V,+12V and -12V

 

 

 

LIST OF EXPERIMENTS:

To Study Frequency Shift Keying by connecting to various Data patterns available on-board.

To Study the output signal by properly tuning the center frequency of PLL (in the Demodulator).

To Study Data recovery by using filters and Data squaring circuits.

 

ALS-CT-09

PULSE POSITION MODULATION AND DEMODULATION TRAINER
Pulse Position Modulation (PPM) is a basic Pulse Modulation technique. The trainer provides complete set up to the students for performing experiments to learn PPM. They can study Sampling, Pulse Modulation, and Demodulation & Signal reconstruction process. Separate circuits are provided for each stage.

FEATURES:

On-board signal generator.

Low Pass Filters at the output.

Various test points to observe the process at various stages.

Potentiometers to vary the frequency of the signal sources.

TECHNICAL SPECIFICATIONS:

LM3524 is used to convert the Input signal (Sine or DC) to Pulse Width Modulated signal and also to generate sampling clock.

Sampling clock: 20K Hz to 50 KHz (Adjustable)

On-board signal generator:

  • Sine wave: 300 Hz to 3 KHz (Adjustable) @ 1V pk-pk
  • DC signal: 1.0 V to 2.3 V (Adjustable)

Modulation: Pulse Position modulation

Test Points: 10 nos

Interconnections: 2mm Sockets with patch cords.

Power: External 5V, +12V and -12V

LIST OF EXPERIMENTS:

To Study Pulse Position modulation and de modulation.

To study change in pulse width and pulse position in accordance with Input signal amplitude.

To Study Effect of sampling clock frequency on the modulated and recovered signal.

To Study Data recovery by using filter, buffer and amplifier.

 

ALS-CT-10

PCM COMMUNICATION USING CODEC
This trainer provides an opportunity to study CODEC. A CODEC has two parts, Encoder
and Decoder. Encoder converts the input audio signal sampled at regular intervals into
PCM data. Decoder converts the input PCM data to an equivalent analog voltage. While
doing this it applies either A-law or Mu-law. It also provides anti-aliasing filter.
The trainer uses HD44233P CODEC which is an A-law codec.


FEATURES:

 

On-board signal generator.

Various test points to observe the process at various stages.

Potentiometers to vary the frequency of the signal sources.

Two numbers HD44233P CODEC is used as modulator demodulator for both way communication.

Amplifiers at the output.

TECHNICAL SPECIFICATIONS:

 

On-board signal generator:

  • Sine wave: 2 nos. 300 Hz to 3 KHz (Adjustable) @ 1.5V pk-pk

 

Test Points: 12 nos

Interconnections: 2mm Sockets with patch cords.

Power: External 5V,+12V and -12V

List of Experiments:

To Study PCM communication with CODEC

 

ALS-CT-11

PULSE AMPLITUDE MODULATOR AND DEMODULATOR TRAINER
Pulse Amplitude Modulation (PAM) is a basic Pulse Modulation technique. The trainer
provides complete set up to the students for performing experiments to learn PAM.
They can study Sampling, Pulse Modulation, and Demodulation & Signal
reconstruction process. Separate circuits are provided for each stage.


FEATURES:

 

On-board signal generator

Low Pass Filters at the output.

Various test points to observe the process at various stages.

Potentiometers to vary the frequency of the signal sources.

Adjustable Sampling rate.

TECHNICAL SPECIFICATIONS:

 

Sampling clock: 20 K Hz to 70K Hz (Adjustable)

On-board signal generator:

  • Sine wave: 300 Hz to 3 KHz (Adjustable) @ 1V pk-pk
  • DC signal: -2.0 V to 2.0 V (Adjustable)

 

Modulation: Pulse Amplitude modulation

Test Points: 8 nos

Interconnections: 2mm Sockets with patch cords.

List of Experiments:

Power: External 5V, +12V and -12V

LIST OF EXPERIMENTS:

 

To Study Pulse Amplitude modulation and de-modulation.

To study change in pulse amplitude in accordance with Input signal amplitude.

To Study Effect of sampling clock frequency on the modulated and recovered signal

To Study Data recovery by using filter, buffer and amplifier.

 

ALS-CT-12
PULSE WIDTH MODULATOR AND DEMODULATOR TRAINER
Pulse Width Modulation (PWM) is a basic Pulse Modulation technique. The trainer
provides complete set up to the students for performing experiments to learn PWM.
They can study Sampling, Pulse Modulation, and Demodulation & Signal
reconstruction process. Separate circuits are provided for each stage.


FEATURES:

 

On-board signal generator

Low Pass Filters at the output.

Various test points to observe the process at various stages.

Potentiometers to vary the frequency of the signal sources.

TECHNICAL SPECIFICATIONS:

 

LM3524 is used to convert the Input signal (Sine or DC) to Pulse Width Modulated signal and also to generate sampling clock.

Sampling Clock: 5 KHz to 40 KHz (Adjustable)

On-board signal generator:

Sine wave: 300 Hz to 3 KHz (Adjustable) @ 1.5V pk-pk

DC signal: 1.3 V to3.7 V (Adjustable)

 

Modulation: Pulse Width modulation

Test Points: 8 nos

Interconnections: 2mm Sockets with patch cords.

Power: External 5V, +12V and -12V

LIST OF EXPERIMENTS:

 

To Study Pulse Width modulation and de modulation.

To study change in pulse width in accordance with Input signal amplitude.

To study effect of sampling clock frequency on the modulated and recovered signal.

To Study of Data recovery by using filter, buffer and amplifier.

 

ALS-CT-14

FREQUENCY MODULATION AND DEMODULATION TRAINER
Frequency modulation (FM) conveys information over a carrier wave by varying its
frequency. In analog applications, the instantaneous frequency of the carrier is directly
proportional to the instantaneous value of the input signal. A simple form of FM often
used for digital communications is FSK. Digital Data can be sent by shifting the carrier's
frequency among a set of discrete values, a technique known as Frequency Shift Keying
(FSK). In FSK frequency changes abruptly in contrast to FM.

FEATURES:

 

On-board signal generator.

Low Pass Filters at the output.

Various test points to observe the process at various stages.

Potentiometers to vary the frequency of the signal sources.

XR2206 is used for modulation.

LM565 is used as a demodulator.

 TECHNICAL SPECIFICATIONS:

 

On-board signal generator:

Sine wave: 500 Hz to 1.5 KHz (Adjustable) @ 3.5V pk-pk

DC signal: 0 V to 5.0 V (Adjustable)

Carrier: sine wave in the frequency range of 53K Hz to 84 KHz

Modulation: Frequency Modulation

Test Points: 9 nos

Interconnections : 2mm Sockets with patch cords.

Interconnections: 2mm Sockets with patch cords.

Power: External 5V, +12V and -12V

LIST OF EXPERIMENTS:

 

To Study change in frequency of the modulator output in accordance with the
DC level of the input signal.

To Study the output signal by properly tuning the center frequency of PLL (in
the Demodulator).

To Study Data recovery by using filters and Data squaring circuits.

 

ALS-CT-15
AMPLITUDE MODULATION AND DEMODULATION TRAINER
Amplitude modulation (AM) conveys information over a carrier wave by varying its
amplitude. In analog applications, the instantaneous amplitude of the carrier is directly proportional to the instantaneous value of the input signal. A simple form of AM often used for digital communications is ON-OFF keying, a type of Amplitude Shift Keying (ASK) by which binary data is represented as the presence or absence of a carrier wave.


FEATURES:

 

On-board signal generator.

Low Pass Filters at the output.

Various test points to observe the process at various stages.

 

Potentiometers to vary the frequency of the signal sources.

Transistors and Tuned circuits are used as modulator.

A simple diode is used as a demodulator.

TECHNICAL SPECIFICATIONS:

 

On-board signal generator:

  • Sine wave: 200 Hz to 2 KHz (Adjustable)
  • Amplitude of sine wave: 1V to 12V(Adjustable)

 

On-board Carrier: sine wave tuned to 100 KHz

Amplitude of Carrier: 3V to 5V(Adjustable)

Modulation: Frequency Modulation

Modulation: Amplitude Modulation

Test Points: 8 nos

Interconnections : 2mm Sockets with patch cords.

Power: External 5V, +12V and -12V

LIST OF EXPERIMENTS:

 

To Study Modulation Index of the modulated signal.

To study effect of over modulation

 

ALS-CT-16

DIFFERENTIAL PHASE SHIFT KEYING MODULATION AND DEMODULATION TRAINER
This trainer provides an opportunity to study carrier modulation of digital signals.
There are various carrier modulation techniques required for transmission of digital
information. Differential Phase Shift Keying (DPSK) is one such modulation scheme. It
is similar to PSK. In PSK before keying, DATA is not conditioned. In DPSK the Input DATA
is conditioned to NRZM format before keying. After demodulation, the DATA is
reconditioned to get back the original DATA
This trainer provides a bit pattern generator and carriers with 0 deg. and 180 deg.
Phase difference.


FEATURES:

 

Data pattern generators.

Carriers with variable frequency.

Low pass Filters.

Wave shaping circuits.

Comparator and Data squaring circuits.

Various test points to observe the process at various stages.

Potentiometers to vary the frequency of the signal sources

TECHNICAL SPECIFICATIONS:

 

On-board Data sources: 4 no.s of Data Patterns ranging from 500 Hz to 2 KHz @ 20K Hz carrier

Carrier: sine wave - 2 KHz to 20 KHz (Adjustable)

Modulation: Differential Phase Shift Keying Modulation

Test Points: 22 nos

Data formatting de-formatting circuits.

Test Points: 8 nos

Interconnections : 2mm Sockets with patch cords.

Power: External 5V,+12V and -12V

LIST OF EXPERIMENTS:

 

To Study Differential Phase Shift Keying by connecting to various Data
patterns available on-board.

To Study Data recovery by using Wave shaping circuits, filters and Data
squaring circuits.