An RF link budget adds defined gains and subtracts defined losses in dB from a starting power level in dBm. Keep reference planes and frequency consistent.
How it works in practice
Include source level, cables, attenuators, splitters and amplifier gain as applicable. Use frequency-specific values and distinguish nominal from measured data. Radiated link budgets also need antenna and propagation terms; a conducted bench budget does not predict coverage by itself.
Example and interpretation
20 dBm source minus 10 dB pad minus 2 dB cable loss gives 8 dBm at the downstream plane before other effects.
Checks before use
- Draw the path
- Collect gains and losses
- Use consistent signs
- Include uncertainty and limits
Important limit
Do not use one nominal budget as proof of field coverage.
Related Centron RF product
SMA 2 W 6 GHz fixed attenuator. Use calculated levels to define a requirement, then compare it with the exact product’s current bandwidth, input power, impedance and available attenuation options. Calculations assume stated conditions and do not replace a component datasheet.
Further reading
Keysight: Fundamentals of RF and Microwave Power Measurements. This background reference explains general principles; the selected Centron RF model’s datasheet governs its own ratings.
Related guides
Educational guide. Numerical examples use the stated assumptions and are not test results for a supplied unit.