confused a little: 5:07 you say signal is reflected back but at 180° out of phase. wouldn't that make the reflected wave opposite sign or side of x axis ? i.e. shouldn't when forward wave is positive reflected should be negative if they are 180° or half wave out of phase?
Thanks for watching. That makes at least 3. :) Confused about the reflected wave? Yes, it's a little non-intuitive. You can think of it like a mirror image where left become right and vice-versa. As shown in the video, moving ahead 180 and continuing from there, only backwards helps resolve errors where the wave terminates at an inconvenient phase. Otherwise just heading back along the forward wave (seemingly in phase) is actually a 180 degree flip, since it's heading the other direction. Bottom line is the majority reflected component always sums to a greater value while the minority component sums to a lesser value. The majority of reflection is always the component which is least maintained by the load; ie: voltage for a Load < Zo and current for a Load > Zo. In reality, more reflections are actually in play but their effect is small compared to the majority described here. The really cool thing about the phase flip is the ability to detect the forward and reflected sums selectively (Bruene Bridge: Part 3). I doubt that explanation helps much. I prefer the visual approach, but we all learn differently. It took me quite some time to become comfortable with transmission line concepts.
confused a little:
5:07 you say signal is reflected back but at 180° out of phase. wouldn't that make the reflected wave opposite sign or side of x axis ?
i.e. shouldn't when forward wave is positive reflected should be negative if they are 180° or half wave out of phase?
Thanks for watching. That makes at least 3. :) Confused about the reflected wave? Yes, it's a little non-intuitive. You can think of it like a mirror image where left become right and vice-versa. As shown in the video, moving ahead 180 and continuing from there, only backwards helps resolve errors where the wave terminates at an inconvenient phase. Otherwise just heading back along the forward wave (seemingly in phase) is actually a 180 degree flip, since it's heading the other direction. Bottom line is the majority reflected component always sums to a greater value while the minority component sums to a lesser value.
The majority of reflection is always the component which is least maintained by the load; ie: voltage for a Load < Zo and current for a Load > Zo. In reality, more reflections are actually in play but their effect is small compared to the majority described here. The really cool thing about the phase flip is the ability to detect the forward and reflected sums selectively (Bruene Bridge: Part 3).
I doubt that explanation helps much. I prefer the visual approach, but we all learn differently. It took me quite some time to become comfortable with transmission line concepts.