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I'd tend to agree with you that 50ohms is fine as a standard, who needs 75? However, as a reader of this thread I'd have to say that far from belly aching the active particpants in the thread are

All you need to do is make a measurement, reverse the DUT and make a 2nd measurement. What you proposed is fraught with trouble and would not work without a lot of effort. The DUT would see 25 ohms

All of the RF world standardizes on 50-Ohms as a system impedance (with very few special applications)................EXCEPT the television industries. Personally, I'm perfectly happy with a 50-ohm

last update for today: I found another spot in the calibration part that had 50ohm hard-coded. The diff attached to this post also corrects for that. for those who want to play along at home (with

Hi Larry, Thanks, I already saw your previous comment and finally checked out the wiki. Since I use the NanoVNAs almost exclusively together with a computer because of the larger screen a 75ohm

I quickly made a female 75ohm SOL cal set from 3 female SMA PCB edge connectors, the 75ohm load is two 0805 150ohm resistors in parallel which measures 75.36ohm with a multimeter. I then used my

ok that's ugly.. I attach the xls But t

Bear in mind that a resistive pad might provide "minimum loss" but is not an "impedance transformer" for making measurements. That is, it's not the same as changing the reference impedance on your

https://www.maximintegrated.com/en/design/technical-documents/tutorials/9/972.html Simple 75 to 50 and 50 to 75 Ohm minimum loss matching pads. These are lossy by nature, about 5.7dB. Best! Steve

Gentlemen - if you look in the forum's file section, you will find NanoVNA & H (not H4) firmware for 75 ohm by forum member Xenomorph.

It will not be perfect since as you pointed out the hardware (bridge, ...) is 50ohm but at least if you calibrate with a 75ohm reference all values displayed will be shown as referenced to 75ohm at

Just to be sure. Can you just change in the code this 50 into 75ohm? Everything (S11 and S21) in the NanaoVNA is measured using a 50 ohm (internal in the device), Perhaps one could recalculate to

code obtained with: git clone https://github.com/NanoVNA-Saver/nanovna-saver.git

addendum to my previous reply ... For those who are using NanoVNAsaver, I had a quick look into the source code for place(s) of hard-coded Z_0 = 50 ohms. I believe (but have not tested ...) that if

those values are correct, your VNA will display values in a 50 ohms world. It doesn't know that you transformed to 75 ohms and calibrated with 75 ohms at the other end of the pad. What you have to do

Roger that... ..and 10-4 It is obviously my fault - but you did not say that If it bothers me that "Johnny still cannot read " I should NOT be participating in forum . I believe that was a title of

So I would have to ask "seller" - is your version "new" and " does it have I/O pins suitable to connect to bluetooth module?" Years ago I purchased SDR hardware which required soldering to SMD IC

Best to start off reading this excellent tutorial.... /g/nanovna-users/files/Absolute%20Beginner%20Guide%20to%20The%20NanoVNA/Absolute_Beginner_Guide_NanoVNA_v1_6.pdf Roger

Also remember that you must press the reset menu item each time before a calibration , otherwise it doesn't take.

If you use the save under the Calibration menu, it prompts you for a memory slot #. If you use the save under the Config menu, it doesn't I did notice that. How do I make sure I am saving to the