RADIO PARAMETERS
QUICK LOAD DEVICE PRESET
Heltec V3
T-Beam
RAK4631
T-Echo
dBm
dBi
dBi
MHz
dBm
SF11/BW125: −136 · SF7/BW250: −120 · SF12/BW125: −137
dB
LINK BUDGET RESULTS
23
dBm EIRP
EFFECTIVE TX POWER
—
dB FSPL
@ ESTIMATED RANGE
—
km
ESTIMATED RANGE
—
dB
FADE MARGIN
LINK BUDGET EQUATION
Fill in parameters above...
NOTES
• FSPL = 20·log₁₀(d) + 20·log₁₀(f) + 32.44 (d in km, f in MHz)
• Fade margin target: ≥20 dB for reliable link
• EU 868: max 25 mW ERP = 14 dBm ERP ≈ 16 dBm EIRP
• US 915: max 30 dBm EIRP (no duty cycle)
• Antenna height gain not included — add ~6 dB per doubling
• Real-world range typically 40–60% of free-space estimate
• Fade margin target: ≥20 dB for reliable link
• EU 868: max 25 mW ERP = 14 dBm ERP ≈ 16 dBm EIRP
• US 915: max 30 dBm EIRP (no duty cycle)
• Antenna height gain not included — add ~6 dB per doubling
• Real-world range typically 40–60% of free-space estimate