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Hi,

When Multipath occurs due signals being reflected and they come in phase the signal increases its strength and when they arrive out of phase the signal decreases its strength , is that it ?

Because i read that if they were 0 to 120 degrees out of phase they would increase its signal ( upfade ), between 121 and 179 they would decrease ( downfade )and 180 they would null each other.

Are these different things ? A signal will only increase strength if it is in phase with main signal or could there be an increase when it is out of phase ?

Last question, if a signal arrive at 90degrees our of phase, would the singal strength increase (upfade) ?

thanks