Moving receiver: http://www.einstein-online.info/imag...ector_blue.gif

"...four pulses are received in the time it takes the source to emit three pulses." http://www.einstein-online.info/spotlights/doppler.html

That is:

The speed of the light pulses relative to the source is c = 3d/t, where d is the distance between the pulses and t is "the time it takes the source to emit three pulses".

The speed of the pulses relative to the moving receiver is c' = 4d/t c, in violation of Einstein's relativity.

Pentcho Valev