Long PCB Shows Effects of Ludicrous Speed

Transmission strains can seem to be magic. When you make use of them it appears unusual piece of wire can block or cross sure frequencies. It is much less frequent to make use of transmission strains with pulses and sometimes your circuit’s transmission line conduct isn’t all that important. That is, till you need to transfer a sign a comparatively lengthy distance. [Robert Baruch] has been utilizing a protracted PCB to test pulse behavior on a bus he’s engaged on. He really has a number of movies on this sequence which might be value watching.

What makes it attention-grabbing is that [Robert] has sufficient distance on the board to the place light-speed results present up. By utilizing a really good DPO7104 oscilloscope and a sign generator, he reveals how the sign displays on the road at varied factors, including and subtracting from it. The measurements matched idea pretty intently. You shouldn’t count on them to match precisely due to small results that happen randomly all through the system.

Before you determine you wish to run out and purchase the identical oscilloscope, you higher verify your checking account. The most cost-effective used one we may discover was about $5,100 and most have been double that (probably as a result of put in choices; we misplaced curiosity in trying). A brand new one is kind of a bit extra.

It could be actually attention-grabbing to construct a board like this for exhibiting how a half wave or quarter wave stub shorted at one finish can act like a filter. In truth, it isn’t so magic if you consider how currents move in an antenna. Transmission strains will be on a PCB like [Robert’s] however you may as well make antennas out of PCB traces.

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