measuring multipath - Multipath Distortion

9-26 — elektor september 1980 ejektor an invitation to investigate, improve and implement imperfect but interesting ideas Multipath distortion occurs when the signal of a transmitter reaches the receiver along more then one "path". Figure one illustrates this. If the difference in distance between two of those signals is equal to an odd number of half wave lengths, then these are out of phase relative to each other. This is the case in fig- ure 2 where the direct (a) and the reflected (b) signals of figure 1 have been drawn. If they are both equal in strength, then one can- cels the other. This is an extreme case and it does not occur that often. There is usually a difference in amplitude between a direct and a reflected signal and, often, more than one reflected signal reaches the receiver. On the other hand, the singnals add when the dif- ference in distance corresponds to an even number of half wave lengths. Let us now con- sider the complete music or speech modulated transmi...