RF Term
Ndb
Ndb is a concept in RF and microwave engineering. This term is commonly encountered in the design, analysis, and testing of radio frequency systems and components. A comprehensive technical definition with formulas, comparison tables, and FAQs will be added in a future update.
Key Equations
NDB (Non-Directional Beacon):
Frequency: 190–535 kHz (LF/MF)
Power: 25 W–5 kW
Reception:
ADF (automatic direction finder) on aircraft
Bearing accuracy: ±3–5°
Range:
Ground wave propagation
R = K×√P (P in watts)
Typical: 15–200 NM depending on power
Frequency: 190–535 kHz (LF/MF)
Power: 25 W–5 kW
Reception:
ADF (automatic direction finder) on aircraft
Bearing accuracy: ±3–5°
Range:
Ground wave propagation
R = K×√P (P in watts)
Typical: 15–200 NM depending on power
Comparison
| Class | Power | Range (NM) | Frequency | Application |
|---|---|---|---|---|
| Compass locator | <25 W | 15 NM | 190–535 kHz | ILS marker |
| Low power | 25–50 W | 25–50 NM | 190–535 kHz | Local approach |
| Medium power | 50–2000 W | 50–100 NM | 190–535 kHz | En route |
| High power | 2–5 kW | 100–200 NM | 190–535 kHz | Oceanic/remote |
| Marine beacon | 10–100 W | 20–50 NM | 285–325 kHz | Coastal navigation |
Overview
Ndb plays a role in modern RF and microwave system design. Understanding this concept is important for engineers working with radio frequency circuits, antennas, signal processing, and electromagnetic compatibility. This page will be expanded with detailed technical content, engineering equations, comparative reference tables, and frequently asked questions.
See Also