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Analog Communication Training System

Key Feature:

  • The Analog Communication System experiments at the Block Diagram level.
  • Theory comes to life as they build different Modulators and Receivers.
  • Self-contained with all required Modulating Signals
  • Carriers generated on Board and the students can connect respective functional blocks using patch-chord to build their required Modulation / Receiver Scheme.
  • Waveforms can be displayed on a Digital Storage Oscilloscope which is generally available in the Laboratory.
    • Inquiry to Buy 
    ARMOR is pleased to announce the Launch of Analog Communication System which allows the Students to learn the fundamental concepts by building the Analog Communication System experiments at the Block Diagram level. Theory comes to life as they build different Modulators and Receivers.

The System is completely self-contained with all required Modulating Signals, Carriers generated on Board and the students can connect respective functional blocks using patch-chord to build their required Modulation / Receiver Scheme. Waveforms can be displayed on a Digital Storage Oscilloscope which is generally available in the Laboratory.

This System covers the complete Analog Communication Curriculum and serves as a very good practical learning board to teach the fundamentals of Analog Communication.

     

    Technical Specification – Transmitter GENERATOR BLOCK

    Function Generator 1

    Waveform: Sine, Square & Triangular

    Frequency: 1Hz to 100 KHz, Variable

    Amplitude: 0 to 2V, Variable

    Faction Generator 2

    Waveform: Sine, Square & Triangular

    Frequency: 1Hz to 100 KHz, Variable

    Amplitude: 0 to 2V, Variable

    Carrier Generator 1

    Waveform: Square wave

    Frequency: 1 KHz to 20 KHz, Variable

    Amplitude: 2V, Fixed

    Carrier Generator 2

    Waveform: Square wave

    Frequency: 1 KHz to 30 KHz, Variable

    Amplitude: 2V, Fixed

    Voltage Controlled Oscillator (VCO) & FM Modulator

    Frequency: 400 KHz to 1500 KHz, Variable

    Amplitude: 0 to 2V, Variable

    Voltage Controlled Oscillator (VCO2)

    Frequency: 400 KHz to 1500 KHz, Variable

    Amplitude: 0 to 2V, Variable

    MODULATOR BLOCK

    Balance Modulator 1

    Modulation               : Amplitude modulation,

    Double sideband, single sideband (USB and LSB)

    Carrier Input             : 1-1000 KHz Modulation Input         : 0.1 – 100 KHz Carrier Null : Adjustable Output Amplitude                : Adjustable

    Balance Modulator 2

    Modulation               : Amplitude modulation,

    Double side band, Single

    side band (USB and LSB).

    Carrier Input             : 1MHz Modulation Input      : 400-500KHz Carrier Null : Adjustable Output Amplitude                              : Adjustable

    Balance Modulator 2

    Modulation               : Amplitude modulation,

    Double side band, Single side band (USB and LSB).

    Carrier Input             : 1MHz Modulation Input      : 400-500KHz Carrier Null : Adjustable Output Amplitude                              : Adjustable

    Colpitt’s Oscillator: 1MHz Sine Wave with variable amplitude 0 to 2V

    Ceramic Filter: Central Frequency 460KHz Bandwidth 10 KHz + / – 3 KHz

    Band Pass Filter:  Central Frequency 1.455MHz Bandwidth 10 KHz + / – 3 KHz

    FDM Transmitter:

    Input 1 Band Pass Filter: 7KHz to 11KHz Fc = 9KHz

    Input 2 Band Pass Filter: 18KHz to 22KHz Fc = 20KHz, Pilot Carrier 256KHz

    Pre-emphasis: Time Period with 50us

    Armstrong Modulator: 450 KHz Carrier Generator with 90° Phase Shifter

    Phase Modulator: Adjustable to 400KHz to 500KHz

    Reactance Modulator: Reactance modulator with variable amplitude

    NOISE GENERATOR & FILTER BLOCK

    Noise Generator & Adder: Adjustable from 0V to maximum input value signal + Noise Adder stage 0 to 4V white noise

    Sweep Generator: Sweep frequency-10Hz, Sweep depth -Adjustable Output for oscilloscope

    -X axis

    RF/Spectrum Detector: Minimum. Input – 100mVpp, Adjustable

    Band Pass Filter:

    Frequency Range 7KHz to 13KHz

    High Pass Filter: Cut off Frequency 3.4 KHz

    Band Reject Filter:

    Frequency Range 7KHz to 13KHz

    Matched T Filter: Cut off Frequency 20 KHz Matched II Filter: Cut off Frequency 20 KHz

    TRANSMISSION VIA ANTENNA AND APPLICATION BLOCK

    Antenna: Ferrite Rod & MW coil

    Output Amplifier:

    600 KHz to 1650 KHz with adjustable gain

    Audio Pre-amplifier: Audio pre-amplifier with Microphone and adjustable gain

    Technical Specification – Receiver RF AMPLIFIER BLOCK

    Rf amplifier: 600 KHz to 1650 KHz with adjustable gain

    LOCAL OSCILLATOR BLOCK

    Output signal: Sine wave for local oscillator input Frequency: 900 KHz to 2.1MHz variable Amplitude: Adjustable from 0 ~ 2Vp-p

    Output impedance: 50 Ohms

    MIXER BLOCK

    Dual gate MOSFET IN

    Inputs: Local oscillator and RF Signal Output Frequency: 455KHz adjustable Filter: Dual tune LC

    IF AMPLIFIER & FILTER BLOCK

    1st IF and 2nd IF amplifier Central frequency: 455KHz Load impedance: Variable R-L-C

    Gain: 32dB with automatic gain control

    Filter 1 & Filter 2: Cut off Frequency of 3.4KHz

    DEMODULATOR BLOCK

    Beat Frequency Oscillator

    Central Frequency: Adjustable to 457KHz Amplitude: 0 to 2V variable

    Diode Envelope Detector

    Detection of Positive & Negative envelope with variable RC filter DSB

    Limiter:

    455KHz central Frequency 1.5V output amplitude

    Quadrature / Product Detector

    Operating frequency: Adjustable from 400KHz ~ 500KHz SSB

    Input amplitude: 1Vp-p

    Foster Seeley / Ratio Detector

    Operating frequency: Adjustable from 400KHz ~ 500KHz SSB

    Input amplitude: 1Vp-p

    PLL Detector

    Operating frequency: Adjustable from 400KHz ~ 500KHz SSB

    Input amplitude: 1Vp-p

    Detuned Resonance Detector Operating frequency: Adjustable from Input amplitude: 1Vp-p

    De-emphasis

    Time Period with 50us

    FDM Receiver

    Band Pass Filter: 7 KHz to 11 KHz, Fc = 9 KHz, Band Pass Filter: 18 KHz to 22 KHz, Fc = 20 KHz

    Power Meter with Integrator and Dump Circuit:

    2 Digit Seven Segment Display with 1 – 15 sec Timer.

    Input signal Amplitude 0 to 2V

    RECEPTION VIA ANTENNA AND APPLICATION BLOCK

    Antenna: Ferrite Rod & MW coil

    Audio Amplifier: Audio Amplifier with headphone and adjustable gain.

    Switch Fault: Switch Faults are provided to simulate fault condition in various parts of the Circuit.

    Power Supply: GND, +5V, + 12V, -12V

    OPTIONAL MODULES

    Module 1: Linear Modulation

    • Amplitude Modulation
    • Frequency Spectrum of AM
    • Power in AM wave
    • Generation of AM signal
    • Modulation Index of AM
    • Observed Linearity Curve of AM Modulator
    • SSB-SC
    • DSB-SC
    • AM Demodulation – Envelope and Square
    • Law Demodulation
    • Phase Discriminator Method
    • Armstrong Modulation

    Module 2: Frequency Division Multiplexing

    • FDM

    Module 3: Angle Modulation

    • Principle of frequency and phase modulation- Relation between FM and PM waves
    • Frequency deviation & Modulation Index of FM
    • Bandwidth of FM
    • Spectrum of FM
    • Armstrong Modulation

    Module 4: Demodulation of Angle

    • Modulated Signals
    • FM detectors-slope detectors
    • Ratio detectors
    • The Phase Locked Loop
    • Pre-emphasis and de-emphasis

    Module 5: Receivers and Noise in

    • Analog Communication
    • Super-heterodyne receiver (AM and FM)
    • Observed Frequency Response
    • of Ceramic Filter
    • Study of Selectivity & Sensitivity of AM Receiver
    • Effect of Noise on Analog Systems
    • Noise Power Spectral Density Measurement
    • SNR and Noise Figure measurement

    Module 6: Filter

    • Study of Band Pass Filter
    • Study of Band Reject Filter
    • Study of High Pass Filter
    • Study of Low Pass Filter
    • Study of Matched T Filter
    • Study of Matched II Filter

    Module 7: Applications

    • Transmit AM Signal Via Antenna
    • Study of Amplifier Circuit
    • Study of Voice communication
    • Study of Switch Fault

     

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