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Link Budget Calculator

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RF Link Budget Calculator | Wireless Propagation System Planner
OPTIONS
MHz
dBm
dB
dB
miles
dB
dB
dBm
dB
Please enter valid measurement settings.
RESULTS
FADE MARGIN
-
FREE SPACE LOSS
-
RX SIGNAL STRENGTH
-
LINK STATUS
-

Input Parameters Specification

Tx Power / Cable Loss System source driver output level matching composite passive line drop steps.
Antenna Gains (Tx / Rx) Directional aperture focus coefficients tracking total radiated focus parameters.
Free Space Path (Distance) Absolute geometric signal displacement field bounds measured over clear line of sight.
Rx Sensitivity Threshold Dynamic minimum boundary scale required by terminal devices to process payloads safely.

Practical Operational Examples

Input Link Profile Matrix

Freq = 2440 MHz, Tx = 23 dBm
Tx Gain = 9 dB, Rx Gain = 24 dB
Distance = 10 miles, Sensitivity = -90 dBm

Calculated Component Results

• Path Loss (FSL) = 124.3 dB
• RSSI Energy = -83.1 dBm
• Computed Link Fade Margin = 6.9 dB

Diagrams & Theory

Tx radio cable antenna path loss antenna cable Rx radio dBm distance Tx power EIRP Rx power Rx sensitivity Margin

A composite Link Budget evaluation sums up system amplification gains and subtracts geometric path attenuations line by line to calculate terminal signal energy envelopes safely.

Formulas & Mathematical Logic

Free Space Loss = C + 20 * log10(Distance) + 20 * log10(Frequency)
ERP = Tx Power - Tx Cable Loss + Tx Antenna Gain
Rx Signal Strength = ERP - Free Space Loss + Rx Antenna Gain - Rx Cable Loss
Fade Margin = Rx Signal Strength - Rx Sensitivity

Constants adjust dynamically matching environment scale vectors ($C=36.6$ for standard miles tracks / $C=32.5$ for kilometer metrics).

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About this tool

Link Budget Calculator is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.