Transmission systems - board system

Transmission systems - board system

In telecommunications, a transmission system is a system that transmits a signal from one place to another and the signal can be electrical, optical or radio signal. Some transmission systems contain also multipliers (to amplify the signal prior to re-transmission) and/or regenerators (to reconstruct and re-shape the coded message before re-transmission).
An example of common transmission system that people use everyday is the mobile network.
The De Lorenzo’s board system is composed of:
1) analogue signal transmission and processing that deal with analogue modulation/demodulation and computing techniques;
2) digital modulation/demodulation and signal transmission that deal with the most common techniques and the operating principles of digital signals;
3) optical transmission to study the principles of the communication (analogue and digital) through optical fibers (ST or POF type);
4) transmission line (simulated by RLC components) to test the propagation of electrical signal with loads;
5) optoelectronics to study the characteristics of the electronic devices that source, detect and control light, usually considered a sub-field of photonics;
6) cellular telephony that deals with basic operations, complete with components (keypad, display, microphone, loudspeaker, DSP and battery charger) to simulate a mobile phone.
All the above systems include faults simulation that can be introduced manually or via software. In this category, there are also available two important trainers, antenna and microwave.
The first designed to introduce students to the comprehension of the antennas operation mode and the second to experiment with the microwave components as well as to study the aspects of wave propagation. They are recommended for high schools and first years of university.

Products Details

ANTENNA TRAINER

The trainer has been designed to introduce students to the comprehension of the antennas operation mode.
Technical features:
The trainer includes: basic panel with generator, Lecher line, RF detector, mobile receiver, joint for fixing to the base, supporting base for receiver, reflector, locking knob, shielded connecting cable between the Lecher line and the detector with banana plugs, diam. 2 mm (length = 60 cm), set of cables for measuring and connections, coaxial support for antenna (mast) with turning base, ‘T’ BNC, set of 5 monopoles with banana terminations, different lengths, ground plane antenna, Yagi antenna, folded dipole antenna, simple dipole antenna, coaxial cable RG59 with F/F BNC, length = 60 cm complete with M/M and F/F adapters. Frequency: from 860 to 950 MHz. Input power supply: - 15 Vdc, 200 mA Examples of performable exercises:
• The Lecher line
• Polarization
• The elementary dipole
• The folded dipole
• The Yagi antenna
• The ground plane antenna
• The matching stub

DL 2595

ANALOGUE SIGNAL TRANSMISSION

DL 3155M60
The design and construction of electronic circuits to solve practical problems is an essential technique in the fields of electronic engineering and computer engineering. With this board the students can study the operating principles of the most common techniques of analog modulation (AM, DSB, SSB, FM and PM) with the aid also of the signal generators and auxiliary circuits as VCO and PLL.

THEORETICAL TOPICS

• Amplitude modulation and demodulation (AM)
• Double side band modulation and demodulation (DSB)
• Single side band modulation and demodulation (SSB)
• Frequency modulation and demodulation (FM)
• Phase modulation and demodulation (PM)
• VCO and PLL circuits • Carrier generator
• Low frequency generator
• Noise generator
• Fault simulation
TECHNICAL FEATURES

•AM modulation and demodulation Carrier input 0 – 15 V peak-to-peak, 70 – 700 kHz Modulator input 0 – 15 V peak-to-peak, 3.5 – 50 kHz
•DSB modulation and demodulation Carrier input 0 – 15 V peak-to-peak, 70 – 700 kHz Modulator input 0 – 15 V peak-to-peak, 3.5 – 50 kHz
•SSB modulation and demodulation Selective filter Carrier input 0 – 15 V peak-to-peak, 300 - 350 kHz Modulator input 0 – 2 V peak-to-peak, 30 – 50 kHz SSB demodulator with ACG FM modulation and demodulation Input 1 – 10 V peak-to-peak, 2-5 kHz Carrier 6-9 MHz Quadrature
•FM modulation and demodulation Input 1 – 10 V peak-to-peak, 3-5 kHz PM modulation and demodulation Input 1 – 5 V peak-to-peak, 0 – 300 Hz
• VCO and PLL circuits Input 0 – 4 V peak-to-peak, 0 – 6 kHz
• Carrier generator 0 – 15 V peak-to-peak, 70 – 700 kHz
• Low frequency generator 0 – 15 V peak-to-peak, 3.5 – 50 kHz
• Noise generator
• Transmission with class C amplifier
• Gain of the receiver 15 dB
Complete with theoretical and practical manual. Dimensions of the board: 297x260mm

DL 3155M60

ANALOGUE SIGNAL PROCESSING

DL 3155M60R
The design and construction of electronic circuits to solve practical problems is an essential technique in the fields of electronic engineering and computer engineering. With this board the students can study the operating principle of analog communication systems and analog signal processing techniques such as multiplication, division, square root, power, logarithm, antilogarithm, attenuation, amplitude modulation and demodulation, noninverting adder, difference amplifier, integrator and shunt.

THEORETICAL TOPICS

• Familiarization with analogue computing technique
• Basic and advanced linear operations
• Simultaneous multiplication and division
• Analog computation of powers and roots
• Log ratio computation
• Antilog computation
• Square root operation
• Attenuator overview
• Characteristics and key specifications for fixed and step attenuators
• Audio attenuators
• Forms of amplitude modulation
• Amplitude modulation and demodulation methods
• The Operational Amplifier characteristics
• Main configurations of the OA
• Fault simulation
CIRCUIT BLOCKS

•Reference power supply unit
•Real-time Analog computational unit
•One-quadrant multiplication unit
•One-quadrant division unit
•Root circuit
•Power circuit
•Log ratio operation with thermic compensation
•Antilog operation with thermic compensation
•Attenuator
•Amplitude modulation and demodulation
•Non inverting summing block
•Difference amplifier
•Integrator
•Differentiator (Shunt)
Complete with theoretical and practical manual. Dimensions of the module: 297x260mm

DL 3155M60R

DIGITAL MODULATION- DEMODULATION

DL 3155M61
The design and construction of electronic circuits to solve practical problems is an essential technique in the fields of electronic engineering and computer engineering.
With this board the students can study the operating principle of the digital communications using the most common techniques such as PCM modulation, PAM modulation, PFM modulation, PWM and PPM modulations and finally the DM modulation with the aid also of a signal of noise, of analog filters and output amplifiers.

THEORETICAL TOPICS

Different types of digital modulation and demodulation for analogue signals Evaluation of pros and the cons of each conversion mode Fault simulation

TECHNICAL FEATURES

•PCM modulator and demodulator
•8 bit coding with compression, Mµ or A selectable through bridge
•2 channels for transmission and 2 channels for reception
•Possibility to use 1 or 2 digital channels
•Integrated anti‐aliasing and band limiting analogue filters in reception, capacitive switching type
•Passing band from 300 Hz up to 3400 Hz
•PAM signal generation, demodulation, transmission for each single channel
•PAM modulator and demodulator
•Two channel time division
•Regeneration of the synchronism and channel signals
•Sampled, but not quantified signal
•PTM Signal Generation
•Passing band from continuous to 4000Hz
•PWM and PPM modulator and demodulator
•Single channel with passing band from continuous to 4000 Hz
•Regeneration of the synchronism signal
•Conversion of the PWM signal to PPM and from the PPM signal to PWM
•PCM signal generation and demodulation
•PCM Signal Time‐Division Multiplexing
•PFM modulator and demodulator
•Single channel with passing band from 300 Hz to 3400 Hz Circuit realization with the use of a PLL
•Delta modulator and demodulator Single channel with passing band from continuous to 3400 Hz Timing Ramp signal generation Channel noise Possibility to adjust the noise that is superimposed to both analogue and digital signals
• Analogue filters 2 analogue filters with 3400 Hz limited band •Output amplifier 2 amplifiers able to pilot a small loudspeaker
•Microphone amplifier
•Microphoneamplifier with automatic gain control Channel bandwidth
Complete with theoretical and practical manual.
Dimensions of the board: 297x260mm

DL 3155M61

DIGITAL SIGNAL TRANSMISSION

DL 3155M62
The design and construction of electronic circuits to solve practical problems is an essential technique in the fields of electronic engineering and computer engineering. With this board the students can study the operating principle of the transmission of digital signals using the most common modulations such as ASK, FSK and PSK with the aid of encoders/decoders NRZ, RZ, Manchester, Biphase and Duo-binary.

THEORETICAL TOPICS

•The transmission of digital signals
•The base band transmission analysed through the study of NRZ, RZ, Manchester, Biphase, DPSK and duo-binary coders and decoders
•The numerical modulators and demodulators to realize, verify and test the ASK, the FSK, the PSK modulation
• Fault simulation

CIRCUIT BLOCKS

•NRZ (Non Return to Zero) coding and decoding
•RZ (Return to Zero) coding and decoding
•Manchester coding and decoding
•Bi-phase coding and decoding
•Duo-binary coding and decoding
•ASK modulation and demodulation
•FSK modulation and demodulation
•PSK modulation and demodulation
Complete with theoretical and practical manual.
Dimensions of the board: 297x260mm

DL 3155M62

AUXILIARY BOARD

DL 3155M62A
The design and construction of electronic circuits to solve practical problems is an essential technique in the fields of electronic engineering and computer engineering.
• Clock and carrier generator, obtained by a single quartz source at 2.4576 Mc/s with a selectable clock frequency of 2400, 4800, 9600, 19200 or 38400 cycles / sec,
• Pseudo-random data generator that generates two random sequences of 1 and 0 of different length, 15 bits and 255 bits,
• Bit Error Rate (BER) meter,
• Digital delay equalizer,
• Artificial noise generator, that generates a quasi-white spectrum signal in the band 2 - 40 kHz,
• Jitter meter.

DL 3155M62A

FIBRE OPTICS

DL 3155E63

The design and construction of electronic circuits to solve practical problems is an essential technique in the fields of electronic engineering and computer engineering. With this board the students can study the operating principle of the communications through the use of the optical fiber analyzing the distortion characteristics and the quality of the transmitted signals.

THEORETICAL TOPICS

• Introduction to fibre optics communication
• Attenuation
• Numerical openings
• Propagation methods
• Transmitted power specifications
• Chromatic and modal dispersion
• Cable attenuation specifications
• Received power specifications
• Time division (TDM) and wave length division(WDM) transmission
• Fault simulation

CIRCUIT BLOCKS

• Clock signal generation
• Serial interface
• ST fibre Analogue input / output POF fibre
• Printer interface
Complete with theoretical and practical manual.
Dimensions of the board: 297x260mm

DL 3155E63

TRANSMISSION LINES

DL 3155E64
The design and construction of electronic circuits to solve practical problems is an essential technique in the fields of electronic engineering and computer engineering. The board has been designed to guide the student to the comprehension and testing of the physical principles of the propagation of electrical signals on transmission lines and as an introduction to the use of the lines as a main element in communications systems.

THEORETICAL TOPICS

• Familiarization with the transmission line theory
• Practical types of transmission lines.
• The four terminal model of the transmission line (Equivalent circuit model)
• Measurement of the characteristic parameters of the line
• Attenuation measurement
• Line frequency characteristics
• Line input impedance
• Stationary waves
• Signal phase shift along the line
• Fault finding along the line
• Line in pulsed state

CIRCUIT BLOCKS

- Function generator - Input and output stages
- RLC simulated coaxial cable transmission line of 80m (4*20m)
- R L C loads Additional modules for coaxial cable measurements:
- Bridge circuits for RLC measurement (DL 3155E64A1).
- Coaxial cable module (DL 3155E64A2).

Complete with theoretical and practical manual.
Dimensions of the board: 297x260mm

DL 3155E64

MICROWAVES TRAINER

MAIN TOPICS
The trainer has been designed to introduce students to the microwave technology.
It consists of a set of components, accessories and instruments and can be used as a laboratory test bench to experiment with the microwaves components as well as to study the aspects of wave propagation.
Our 3 cm. waveguide trainer provides users with an in-depth training on frequency transmission characteristics and gives students the possibility to perform all the main exercises in this field.
The trainer is provided complete with a detailed educational manual.
The trainer includes the following components: variable attenuator, crystal detector, directional coupler, shorting plate, matched termination, waveguide to coaxial adaptor, waveguide, frequency meter, 6dB fixed attenuators, hybrid tee, horn antenna, slotted line, slide screw tuner, function generator (with DDS PLL built in), power meter, SWR meter.

DL 2594N

Download Area

ProductsCodeCatalogueTender specsManuals SimpleVideo
ANALOGUE SIGNAL TRANSMISSIONDL 3155M60
ANALOGUE SIGNAL PROCESSINGDL 3155M60R
DIGITAL COMMUNICATIONDL 3155M61
DIGITAL SIGNAL TRASNSMISSIONDL 3155M62
AUXILIARY BOARDDL 3155M62A
FIBER OPTICSDL 3155E63
TRANSMISSION LINEDL 3155E64
ANTENNA TRAINERDL 2595
MICROWAVES TRAINERDL 2594N
OPTO ELECTRONICSDL 3155M70