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Those interested in how the TDR was implemented in NanoVNA Saver will find the details in this groups.io post by Herb Walker. /g/nanovna-users/message/9651 For more details on how

Jim Lux, That was a well written explanation of how "TDR" is done in the NanoVNA. Thanks for taking the time to write it up. Roger

i added a bluetooth module to my sark100 and can now measure "wireless" (use smartphone to display sweeps) dg9bfc sigi Am 10.06.2023 um 16:33 schrieb KK4ITX John via groups.io:

Not at all - NanoVNA-Saver also does the calculations - for calibration, for instance, as well as TDR. It's in ./Windows/TDR.py If you know how inverse FFT to generate the time domain works,

The calculations are in ./Windows/TDR.py (not ./Charts/TDR.py, that's what actually does the plotting) Little discouraging, but I found the same "source code "..... I also realized that , also

We all have our favorites, mine is the SARK 100, got it from Amazon for around $50. It has a bright backlit screen, apply 12v and you’re ready to go, in 30 seconds you have your SWR. Absolutely

Hi Fran?ois, As an example, I routinely use a nanoVNA or antenna analyser to adjust my 136 and 475 kHz antennas at my home and remote QTH's, via a switch or PC-selected port which routes the antenna

On Thu, Jun 8, 2023 at 01:53 PM, Jim VE7RF wrote: <Before the VNA was available, I would just measure the C between center conductor + braid. Knowing how many pf per foot the cable was, it's a

MFJ also has about 8 different antenna analyzers available, some analog and some digital. Comet has very nice ones, too, for around $500. NanoVNA is by far the cheapest, but comes with no

That's good, but anyway, even if the resonance has been found for each of the two frequencies (zero reactant), the radiation resistance will not be identical and neither will be 50 ?. That's why I

When you adjust a fan dipole trim the high frequency one first. Then the lower one, and lower and so on. Look up G3BDQ's book on Practical Wire Antennas.

Hello Some OMs, in fact, temporarily replace their Tx with a nanoVNA to adjust their tuning box. You have to be careful that the TX does not end up in front of the NanoVNA. In France we call that:

Hopefully, if we ignore you, you will stop your BS as you have done in other groups and just fade away. We are willing to help those who are really wanting and needing it. Not those who spread crap

I mainly just want to use it to find the best position on my coil! Lol Its small a lot more portable then a mfj and affordable if it breaks in the field. The stock owner manual goes way overboard

A NanoVNA calculates the SWR for you. If this SWR is so important for an OM at the output of its Tx, it is not a very relevant measurement produced by a NanoVNA. SWR is a number and only *one* A

Thanks for trying to be a help brother. I watched both those videos before but something in them just didn't click. I just sat down and read the beginner's guide start to finish and setting this one

Mike, I found these short videos very helpful for doing SWR readings on antennas. How to read SWR on nanoVNA. https://www.youtube.com/watch?v=xa6dqx9udcg How to calibrate

The calculations are in ./Windows/TDR.py (not ./Charts/TDR.py, that's what actually does the plotting) It's pretty straightforward in function updateTDR() - blackman window, ifft, convolution with

Allow me to discourage you from such posting... you will get crucified by "guardians of purity of nanoVNA" , but I assume you are an adult and can take it. Yes, the nanoVNASaver is a challenge , to

The TDR feature in NanoVNA Saver has some issues. In 5.5 it does not plot the time graph correctly. In all versions the impedance graph was not correct in the initial release and still has