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Re: TDR Measurement

 

I am finding that watching YouTube videos on the NanoVNA over and over again it is starting to sink in how to use the many features. Just take time to read and re read the instructions and watch and re watch the videos. These guys trying to show us things know what they are doing but either are or were gurus in this type of device or they had to do the same thing I am doing over and over again to figure it out. There is NO easy road. These wonderful devices are NOT plug and play.

In fact my old MFJ wasn¡¯t plug and play even though in my ignorance I thought it was. Since I have sold it I have learned so much more about what it really can do.

I have a friend who sold his nice RigExpert after understanding what his $50 nano was capable of. Now he has $300 to spend on other radio toys.

Dave K8WPE

David J. Wilcox K8WPE¡¯s iPad

On Sep 16, 2020, at 7:17 PM, Clifford Heath <clifford.heath@...> wrote:

?If you want a TDR, there's nothing like a proper TDR. I have a Tektronix 7904 with the 7S12 plugins (25ps resolution), but it's fragile and I don't use it much. You can measure the impedance of individual PCB traces and see signals jump on and off SMD components and connectors. It's a shame we haven't seen a "nanoTDR" product actually. It would be a good deal simpler than the NanoVNA, and read impedance-over-length more reliably, if only to 100ps resolution or so.

Nevertheless, I suspect this won't help Helmut. My father used to say "people will never forgive you for their own stupidity". It's a lesson to not try to demonstrate something to an audience without having practised it yourself.
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