PRODUCT OVERVIEW: The SB-TEK SB-2NTL Advanced Network Filters & Transmission Line Trainer is a high-precision academic laboratory platform designed for comprehensive study of RF networks, filters, transmission lines, and antenna characteristics. Developed for engineering institutions and professional training laboratories, the system combines hands-on experimentation with highly accurate RF measurement tools, enabling students to visualize impedance, attenuation, signal propagation, and radiation behavior in real time. The trainer features modular design, industrial-grade components, and built-in safety features, making it an ideal solution for communication engineering, RF studies, and electronics laboratories.
TECHNICAL SPECIFICATIONS
General Parameters
The trainer operates from a 230V AC, 50Hz input supply and uses a regulated 12V DC operating voltage. It supports a wide frequency range of 100Hz to 30MHz with a measurement accuracy of ±2%. The system is built within compact dimensions of 600mm × 450mm × 200mm (L×W×H) and has a total weight of 10kg. It is designed in compliance with IEC 61010-1 safety standards for laboratory electrical equipment.
Hardware Modules:
Symmetrical/Asymmetrical T & ? Network:
The unit includes symmetrical and asymmetrical T and ? network sections equipped with variable resistors ranging from 1? to 10k?, precision capacitors ranging from 100pF to 1?F, and inductors between 1mH and 100mH, enabling flexible network analysis.
Attenuator Section:
A dedicated attenuator section features T-type and ?-type attenuators, each with a 0–40dB adjustable range and step resolution of 1dB for accurate attenuation measurements.
Filter Networks:
Integrated filter modules include low-pass filters with 1MHz cutoff, high-pass filters with 500kHz cutoff, band-pass filters centered at 2MHz with a 200kHz bandwidth, and band-stop filters centered at 3MHz with a 300kHz bandwidth.
Transmission Line Section:
The transmission line module incorporates selectable 50? or 75? coaxial lines, a quarter-wave transformer configured for ?/4 at 10MHz, and load options including open, short, and terminated terminations for impedance and SWR studies.
Antenna Measurement Unit:
The system contains a dipole antenna designed for ?/2 at 30MHz, a 360° rotatable mount for radiation measurements, and a built-in field strength meter for antenna characterization.
Measurement Instruments:
The trainer includes an RF millivoltmeter covering the range of 1mV to 10V, a digital frequency counter supporting 1Hz to 100MHz, and a phase difference meter with a measurement range of 0° to 180°. These instruments enable accurate, real-time analysis of RF signals and network behavior.
Safety Features
The unit incorporates comprehensive safety provisions including overvoltage protection, short-circuit protection, fully insulated banana jacks, and an emergency power cutoff switch for safe laboratory operation.
EXPERIMENT LIST
Network Analysis
• Measurement of characteristic impedance of symmetrical T and ? networks
• Image impedance measurement of asymmetrical T and ? networks
• Attenuation measurement using T-type attenuators
Filter Characterization
• Attenuation versus frequency response evaluation for low-pass filters
• Frequency response analysis of high-pass filters
• Characterization of band-pass filters
• Analysis of band-stop filter attenuation behavior
Transmission Line Studies
• Measurement of characteristic impedance of various transmission lines
• Impedance matching experiments using quarter-wave transformers
• Standing Wave Ratio (SWR) measurement and interpretation
Antenna Measurements
• Radiation pattern measurement of dipole antennas
• Analysis of antenna polarization characteristics
Key Features:
The trainer features a modular design allowing individual operation of filter, transmission line, and antenna sections. Real-time plotting functionality is supported through PC connectivity via USB, enabling live visualization of frequency response graphs. Hands-on learning is ensured through adjustable component values using rotary switches, allowing students to observe immediate effects on impedance and attenuation. The system uses industry-standard RF connectors such as BNC and SMA for professional-quality experimentation.
Installation, Training & Documentation
SB-TEK provides free installation, commissioning, operation, and maintenance training at the purchaser’s Power Electronics (PE) laboratory site. Also include the original product catalogue, user manual, and product description manual with the system.
Warranty
The SB-2NTL trainer includes a 1-Year Warranty starting from the date of delivery.
