berkeman's latest activity
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berkeman replied to the thread A philosopher who challenges the basics and their assumptions.Welcome to PF. Please be sure to read the PF Rules (see INFO at the top of the page). We do not allow personal speculation or... -
berkeman replied to the thread Interpreting VIA PCB through TDR and TDT.Sorry, I meant to post a different 2nd link: https://en.wikipedia.org/wiki/Telegrapher%27s_equations This equation from that link...
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berkeman replied to the thread Interpreting VIA PCB through TDR and TDT.BTW, do you want me to fix the "TRT" in your thread title to "TDT"?
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berkeman replied to the thread Interpreting VIA PCB through TDR and TDT.https://en.wikipedia.org/wiki/Reflection_coefficient https://en.wikipedia.org/wiki/Telegrapher%27s_equations EDIT -- fixed 2nd link.
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berkeman replied to the thread Interpreting VIA PCB through TDR and TDT.The direction of the reflection (adding or subtracting from the transmitted pulse) will tell you if the ##Z_0## mismatch at the via is...
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berkeman replied to the thread Interpreting VIA PCB through TDR and TDT.The "TD" in TDR refers to the time domain (Time Domain Reflectometer). It measures reflections in the time domain as seen at the...
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berkeman reacted to Ken Fabian's post in the thread Artemis 2 launch - humans return to the Moon after 54 years with
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You sure the sun is behind the Earth in this pic? Remarkable colour photography of night-side if that is the case. More usually we would... -
berkeman replied to the thread Artemis 2 launch - humans return to the Moon after 54 years.Just a friendly reminder that PF is a science forum and conspiracy theory nonsense does not belong here. Enough said (hopefully).
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berkeman replied to the thread Interpreting VIA PCB through TDR and TDT.What you show is a 3-layer PCB, which is not used in practice. This point made by @Baluncore should be emphasized. It is generally a...
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berkeman replied to the thread Marcus Jensen.Welcome to PF. It's great that you are so interested in Science at such a young age. :smile: Please be sure to read the PF Rules (see...
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berkeman reacted to Baluncore's post in the thread Interpreting VIA PCB through TDR and TDT with Like.
You have two tracks with known impedance, joined through the PCB by a short cylindrical via. The via will probably not match the...
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No it isn't. That looks like a launch from complex 40 (Falcon 9) not 39B, but in any case that picture is quoted in a post by Chris...
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I look at pictures of the Artemis II launch taken up close, like this one: and I'm amazed by how much energy and resources have to be...
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Welcome to PF. This is a problem of understanding how the circuit works, assuming perfect components. If you specify the frequency...
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berkeman replied to the thread Engineering Half wave voltage doubler.Welcome to PF. This basic schoolwork question does not involve detailed values like frequency and parasitics. It is just a basic...
