Without changes in the firmware it will not work properly. Of course, if you're only interested in SWR it's probably enough, but you'll see 50 ohms instead of 75 when measuring impedance.

In this firmware https://github.com/DiSlord/NanoVNA-D/releases/tag/v1.2.40 is a option DISPLAY/PORT-Z where you can specify impedance, ex 75, or 100 etc. Calibrate normally before entering PORT-Z with

These params work for me: for dfu file: dfu-util -a 0 -D filename.dfu for bin file: dfu-util -d 0483:df11 -a 0 -s 0x08000000:leave -D filename.bin

@Roger, thank you for these tests that confirm the problem, you did a good job! @Siegfried - after all, the whole topic is about getting an incorrect result despite calibrating the cable. Did you meas

@Brian - It may be relevant. Comparison of Open in calibrated NanoVNA-App and calibrated NanoVNA-Saver. In Saver it looks better, oscillating around 1 and in NanoVNA-App it is > 1 for all points.

@DiSlord - But that's exactly right. The measurement range is identical to the calibration range, the number of points is also the same, the calibration frequencies are equal to the measurement freque

@Brian - My s1p was generated in NanoVNA-App. Whether there is a period or a comma probably depends on operating system's regional settings. According to wikipedia https://en.wikipedia.org/wiki/Decima

Roger, thank you for reproducing the experiment. We have clarity that it is a Bug after all. I did an experiment in which I change the calibration data for a 4 specific frequencies by editing a copy o

Could someone be so kind as to reproduce this measurement at his computer, on his copy of the NanoVNA-App, with his NanoVNA and his cable of several meters? If the result is good, it means that I am d

Hello Roger and John. I did not write exactly what the s1p files are, sorry. short.s1p open.s1p = These are the cable measurement files with calibration in the NanoVNA-App application. These are the r

Hello. If I connect a cable to the NanoVNA and calibrate OSL at the end of that cable, and measure the same cable, I should get 1 small point to the right of the Smith chart when the cable is open, or

Recal saved s1p bmp and cal data is possible in DiSlord firmware in sd card menu. I'm not sure from which version, but I think it's 1.2.00. DiSlord commited this option to open source version at Dec 2

For 9600 transmission you need an FM modulator whose deviation directly depends on the amplitude of the signal. There can be no filtering or preemphasis/deemphasis there. In other words, you feed a si

In the current firmware there is an option to control the device through the serial port, instead of the usb port. (Menu/Config/Connection/Serial and Serial Speed) I used a Serial/Bluetooth HC-05 conv

You cannot upload normal firmware to S-A-A V2.2 with DfuSE.In this version of NanoVNA there is a bootloader at the beginning 0x08000000. If you have uploaded firmware from this address, you have overw

You will only have 3-4 calibration points in the 3-4MHz range, and 101 measurement points. If the error is large, you will notice ripples on the graph. I recently measured an antenna on a car using a

How is the sweep synchronized in both of these devices? Unless it doesn't have to be synchronized, but it seems to me that it does.

David Reichard: That's not what I thought about, maybe it's a language barrier issue, I'm using a translator.The SWR meter designed for 50 Ohms is only able to measure SWR for a 50 Ohm antenna system,

The NanoVNA measuring bridge at the S11 connector is in equilibrium at a load of 50 Ohms, and works most accurately in this region. The further away from 50 Ohms the more error there is in the measure

If you calibrate at the end of the cable, there should be no difference in either case. But I would choose option 1 because the attenuation of 18 feet of LMR-100 at 145MHz is only 1.62 dB and the perf