Cum se calculează Link Budget
Ce este Link Budget?
Calculates wireless link margin comparing transmit power and gains against path loss and noise. Determines link reliability and range.
Formulă
Path loss = 20 log10(4πd×f/c)
Ghid pas cu pas
- 1Transmit power + antenna gain - cable loss - path loss + receive gain - noise figure = link margin
- 2Path loss = 20 log10(4πd×f/c)
- 3Positive margin = good signal; negative = insufficient range
- 4Typical 10-20 dB margin for reliability
Exemple rezolvate
Intrare
Tx 30dBm, path loss 100dB
Rezultat
-70dBm rx
Greșeli frecvente de evitat
- ✕Not accounting for cable losses (2-3 dB typical)
- ✕Using theoretical max power instead of regulated output
Întrebări frecvente
What's acceptable link margin?
Minimum 3 dB; 10+ dB good; 20+ dB excellent; accounts for fading and interference.
How do I improve link budget?
Increase transmit power, better antennas, lower frequency, shorter distance, or better receiver.
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