开云体育

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 with

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 nanoVNA.

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 1s

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 problems. I

There is an Absolute Beginners Guide to the NanoVNA in the Files section of this group

I bought a NANO VNA when they first came out to use as a antenna analyzer. I sold it after I bought a regular analyzer and since bought another VNA This is new updated software is confusing compared

It's useful to know how to make the TDR work - I've found more than one feedline problem by using TDR - yeah, sometimes if there's combinations of solid, foam, and air dielectric, the distances don't

Is your coax foam or solid dielectric - RG-6 comes in both forms. What does the trace look like? (can you save it and post it?) I'd expect around 41-42 meters if set to VF=1 (or 100%). if it's set to,

If it is indeed a USB communication error as others have suggested, have you tried using a different USB cable between the NanoVNA and PC? Maybe even try a different USB port on the PC. Are you

Why are you using TDR to do this task? Just sweep from 50 kHz to 20 MHz and set yellow trace to s11 Phase and Green to Smith chart. Then just spin the marker and you can see what you want. Attached is

To directly answer this, what you need to know is the electrical length of the cable, not the physical length. And nanovna-saver can directly display this without the complication of TDR and VF

Here is a new twist .... I replaced current , unknown type , unmarked type of coax with known, good RG6 length plainly marked in cubits and converted them to meters - approximately 35 meters. Now when

I tried a couple of ferrite beads also tried updated software but no luck. I need to get a few more beads to see if that works. Like Stan, I am suspicious that it might be RF. May be a few weeks but

Step size (span/number of points) sets the "unambiguous range" - if the steps are too far apart, then the true length might be a multiple of 1/step size longer. So, if you've got, say, 100 ft of coax

OK, the discussion did covered the theory , now is the time to apply it and be practical. . I shall repeat the task is - is the unknown length of cable in multiples of 1/4 wavelength @ 14 MHz band,?

I have a NanoVNA H4 and it's great for measuring antennas from inside the shack, but not quite rugged enough to used outside up a ladder. Also the display is hard to read in the sunshine. For outside