The two pulses are both emitted from the TDR.

Really, you are only interested in the red box. Here, the pulses after the first are reflections.

Everything to the right of the purple line is from the next pulse emitted by the TDR.

 

Really, you are only interested in the red box. Here, the pulses after the first are reflections.

yeah, i will like to listen more....!!

 

What else would you like to know?

(Cheers Georacer)

 

Why you are using two pulses and after reflection how we know this pulse is of open and short circuit??

 

I think he uses a pulse train. He needs to send pulses continuously, because his oscilloscope doesn't have a memory to record the response. So he needs to pulse continuously to be able to see the reflection at all times.

It's just that two pulses can fit in his screen. If he zoomed in the time, I bet he would see only one.

 

Georacer hit the nail on the head.

 

I'm surprised no-one spotted the, er, deliberate mistake.

Can a mod change the formula to λ=c/v

 

Actually you can. As a Sr. Member you can edit your personal posts forever.

 

That's spooky, I checked earlier and there wasn't an edit tab...

But there's one now...

Ohhhhhh....

 

Hola sparky49,

Could you post a readable circuit? I would like to build it.

Congratulations for the job.

Gracias.

 

Sorry, it does seem pixleated...

I will get one up soon.