📡 RF Link Budget Calculator
3GPP / Ericsson / Nokia aligned · Microwave / 5G / Satellite links
📤 Transmitter
dBm
dBi
dB
dB
🌍 Link Parameters
MHz
km
dB
📡 Receiver
dBi
dB
dB
dBm
dB
dB/km
dB
dB
⚡ Formulas align with 3GPP TR 38.901 & ITU-R P.525 · EIRP, FSPL, Rx Power, Link Margin
📊 Link Budget Results
Live update · color intensity indicates performance
📡 EIRP (Effective Isotropic Radiated Power)0.00 dBm
🌍 Free Space Path Loss (FSPL)0.00 dB
📥 Received Power0.00 dBm
📈 Link Margin0.00 dB
✅ Link Status
PASS
📡 EIRP (dBm)
EIRP = PTx + GTx – LTxCable – LTxOther
→ Transmitter Power + Antenna Gain – Cable Loss – Other Losses
EIRP = PTx + GTx – LTxCable – LTxOther
→ Transmitter Power + Antenna Gain – Cable Loss – Other Losses
🌍 Free Space Path Loss (FSPL) [dB]
FSPL = 32.44 + 20·log10(fMHz) + 20·log10(dkm)
→ ITU‑R P.525 standard formula (f in MHz, d in km)
FSPL = 32.44 + 20·log10(fMHz) + 20·log10(dkm)
→ ITU‑R P.525 standard formula (f in MHz, d in km)
📥 Received Power (dBm)
PRx = EIRP – FSPL – LAdd + GRx – LRxCable – LRxOther
→ Includes additional path losses (atmospheric, rain, obstruction)
PRx = EIRP – FSPL – LAdd + GRx – LRxCable – LRxOther
→ Includes additional path losses (atmospheric, rain, obstruction)
📈 Link Margin (dB)
Margin = PRx – SensitivityRx
→ Positive margin means signal above receiver threshold
Margin = PRx – SensitivityRx
→ Positive margin means signal above receiver threshold
✅ Pass / Fail Criteria
PASS if Margin ≥ Required Fade Margin
→ Ensures link reliability under fading conditions
PASS if Margin ≥ Required Fade Margin
→ Ensures link reliability under fading conditions
All formulas comply with 3GPP TR 38.901, ITU‑R P.525, and common industry practices (Nokia, Ericsson).
EIRP strength
FSPL
Rx Power / Margin
Fail threshold
✅ Pass = Link Margin ≥ Required Fade Margin | 🧾 Industry standard formula (ITU‑R)