fren6·2 lata temu·discussOn the contrary, I've used the standard "free space path loss" formula, aka path loss in vacuum. You'd have to add additional losses for water vapor and atmosphere, I have no idea how much additional loss they would incurr. Maybe 5dB?
fren6·2 lata temu·discussPath loss for 2.4 GHz at 600km is 155dB. BLE tx power is 10dBm, sensitivity is -103dBm. There is 155-113=42dB missing.I guess they get 21dB from directional antenna, another 21dB from message coding (essentially repeating each bit 128 times to improve SNR)?