The Albert Einstein Institute http://www.einstein-online.info/spotlights/doppler teaches that, when the light source starts moving towards the stationary observer (receiver), the distance between subsequent pulses emitted by the source DECREASES:

http://www.einstein-online.info/imag...ler_static.gif (stationary source)

http://www.einstein-online.info/imag...ource_blue.gif (moving source)

In contrast, when the observer starts moving towards the stationary source, the distance between subsequent pulses emitted by the source REMAINS UNCHANGED:

http://www.einstein-online.info/imag...ler_static.gif (stationary observer)

http://www.einstein-online.info/imag...ector_blue.gif (moving observer)

Clearly the moving-observer scenario is fatal for Einstein's relativity. Since the distance between subsequent pulses REMAINS UNCHANGED, the frequency measured by the observer shifts (Doppler shift) because the speed of the pulses relative to the observer shifts, in violation of Einstein's relativity.

Pentcho Valev