Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

EIRP (dBm)

Required number input.

Receiver gain (dB)

Required number input.

Path loss (dB)

Required number input.

Receiver sensitivity (dBm)

Required number input.

Compute the link margin in decibels as EIRP + receiver gain - path loss - receiver sensitivity. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Link margin (dB)

The resulting link margin returned as a number.

• RF gain, noise, compression, intercept, mismatch, sensitivity, and link calculations require consistent impedance, bandwidth, frequency, reference plane, temperature, modulation, and cascade ordering. Datasheet values at different conditions cannot be combined without correction.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Link Margin dB

  Compute the link margin in dB as EIRP plus receive gain minus free-space path loss minus receiver sensitivity.

• FSPL Calculator

  Calculate free-space path loss in decibels for a link distance and frequency.

• EIRP Calculator

  Calculate effective isotropic radiated power from transmitter power, antenna gain, and cable loss.