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Link Budget & Path Loss Calculator

Analyze complete carrier link budgets, mapping equivalent isotropically radiated power (EIRP), free-space path loss (FSPL), and system margins.

Link Parameters
Transmitter (Tx) Setup
Equivalent: 15.0 dBW / 31.6 W
Dish Dia (m)
Efficiency (%)
Tx Waveguide/Feed Loss (dB)
Propagation Path
Atm (dB)
Rain (dB)
Misc (dB)
Receiver (Rx) Setup
Dish Dia (m)
Efficiency (%)
LNB NF (dB)
Ant Temp (K)
Signal & Modulation
Bandwidth (MHz)
Bit Rate (Mbps)
Modulation
Req. Eb/No (dB)
Link Budget ResultsLink Locks
Calculated Eb/No
18.94
dB
Required Eb/No
6.0
dB (QPSK)
Link Margin
+12.94
dB
Transmitter EIRP55.7 dBW
Free Space Path Loss (FSPL)205.6 dB
Total Propagation Losses206.6 dB
Received Signal Power (Prx)-115.6 dBW
System Noise Temperature170 K
Receiver G/T13.0 dB/K
Carrier-to-Noise Density (C/N0)90.7 dB-Hz
Carrier-to-Noise Ratio (C/N)20.7 dB
Power Level Cascade Diagram
+60 dBW-55 dBW-170 dBW15.0 dBWTx Pwr-1.0 dBFeed Loss55.7 dBWEIRP-207 dBPath Loss+35.3 dBiRx Ant-115.6 dBWPrx
Diagram showing relative power levels from Tx Output → Waveguide Feed → Satellite EIRP → Space Attenuation → Rx Reflector → Carrier Reception.