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Years ago I needed to do some tests with a real TDR, so I put one together using some CMOS chips. It worked quite well despite its simplicity. It didn't care what the impedance of the transmission

Can’t you just put it up as you intend to use it and find the low points in the SWR chart, or am I forgetting something? That way it would work against the counterpoise/ground plane that you intend

Yes, it is, I did it many times and it gives me repeatable results. Simply connect the single wire into the S11 input (a cable with a PL239 socket here), I also ground the nanovna at the socket (the

You need to measure against a counter poise. Use 1 or more quarter wavelength radials connected to the ground connector shell of the nanovna. Try to replicate you operating position. Mike N2MS

Because the TDR is not really a TDR. Using frequency sweeps it does a TDR like function.But it's just a VNA doing calculations on the peaks and dips of a sweep. Just a wire by itself is NOT a 50 Ohm

The "TDR" function works - why shouldn't this? It's simple enough to test, too! -- Doug, K8RFT

Hi Brian The basic wavelength calculations would of course be your starting point.Height above ground, nearby objects, are all issues and again you really need a counterpoise to get a good

Thanks Kent. I wasn't looking at this from a 1/4 wave antenna perspective. I was looking at trying to find what frequencies can be found in a length of wire x feet long. I just happen to use the

Not really A 1/4 wave antenna is NON-FUNCTIONAL. i.e. it does not work ........ by itself. A 1/4 wave only works as a resonate antenna went mounted on a ground plane about 1/2 by 1/2 wavelengths. So

We can use the time honored formula of 234/length to get the quarter wave frequency of a piece of wire. But... is there a way to connect that wire (e.g. 14AWG 7 strand insulated) to the NanoVNA and

I recommend you have a look at this guide /g/nanovna-users/files/Absolute%20Beginner%20Guide%20to%20The%20NanoVNA

I have an OG nanoVNA - about 2-1/2 years now and am thinking about updating the firmware. How do I find out the hardware version number and the firmware version number for my unit? I would like to

Yes, use the x64.zip file. No need for the source zip file. Extract the zip, then click on the exe file to run it. Your older firmware should be fine; you only need newer firmware if you want more

Roger, Thanks for that info - I did have the right page but guess I didn't wait long enough fo the program to load. I should use the .64 program, since I have Win 10 as my OS, correct? Also, do I have

This is the official NanoVNA Saver github release directory https://github.com/NanoVNA-Saver/nanovna-saver/releases/tag/v0.4.0 When you start it you will get a black command box. Be patient It will

For most of today I have been searching for a nano saver offering that works with my SAA-2N and that will actually download. I've seen lots of github lists of programs with no ".exe"in the program. i

Yes, you always calibrate at the very end of the cable you are going to use then..

Thank you DiSlord for helping realize my mistake. I was inputing the stimulus frequecy and instead of pressing the M, I was pressing the x1. 73, John - W7OTD

Thanks again for your help

For a rough and ready cal, for the open, just don't put anything on. For HF, there's not a lot of difference between a connector that's open, and a connector that's missing. It's the short that you