Calculadora de Orçamento de Enlace — Formula
## How a Link Budget Works
A link budget adds up all gains and subtracts all losses between transmitter and receiver to find the received power.
### Formula
**P_rx = P_tx + G_tx + G_rx - L_path - L_misc**
**Link Margin = P_rx - Receiver Sensitivity**
A positive link margin means the link will work. Engineers typically design for 10-20 dB of margin to account for fading and environmental variation.
A link budget adds up all gains and subtracts all losses between transmitter and receiver to find the received power.
### Formula
**P_rx = P_tx + G_tx + G_rx - L_path - L_misc**
**Link Margin = P_rx - Receiver Sensitivity**
A positive link margin means the link will work. Engineers typically design for 10-20 dB of margin to account for fading and environmental variation.
Exemplo Resolvido
30 dBm transmitter, 15 dBi antennas on each end, 120 dB path loss, 3 dB misc losses, receiver sensitivity -90 dBm.
- Received power: 30 + 15 + 15 - 120 - 3 = -63 dBm
- Link margin: -63 - (-90) = 27 dB
- Link is viable with 27 dB margin