How fast do the devices have to move for a Bluetooth signal to change from a 124mm wave to a 121mm wave?

When devices move, the Doppler effect can occur with sound. This could theoretically also happen with radio waves. How fast would two Bluetooth devices have to move toward each other for a 124mm wave to collapse into one 121mm? Then the Doppler effect would occur, and the signal would be received incorrectly. What would it be like with Wi-Fi?

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Hacken90
1 year ago

Here is the formula for the Doppler effect. You have to convert the wavelengths to frequency by sharing them through the speed of light. fB is then the observed frequency and fS is the transmitted frequency. c is the speed of light vB and vS are the speeds of observer and transmitter.

ThomasJNewton
1 year ago

slightly simplified c*(124-121)/124=7258km/s.
That would be roughly 900 times the ISS.