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Below are the test results from my 16 GB SD card... Warning: Only 14753 of 14754 MByte tested. Test finished without errors. You can now delete the test files *.h2w or verify them again. Writing

Here is the Zsource I derived (using the method of Owen Duffy). I used one 100ohm SMD resistor (99ohm using DVM) soldered between two female SMA PCB connectors: [image: afbeelding.png] Zsource indeed

Hello ROger, I check again and if I use a Zsource of around 43ohm and a Zload as measured using the S11reflect of port2. Using that Zsource gives me more or less comparable graphs for the differently

that's a bit less than 2 ppm. That's pretty good for an inexpensive TCXO.? If you want to hack, you might be able to put a voltage on the trim input, but that could actually make things worse. You're

Thanks for posting those. I guess that Auto would somehow adjust the current based on reflected (or thru) values to try to keep the reflected (or thru) values in some range? 520 Hz in 300 MHz seems

FYI - I made an output voltage measurement based on the "Px" settings (on my H4, fw v1.2 from the release .dfu file, o'scope w/ 50ohm input, CW=10MHz, square wave: Pauto 160mV P2mA 160mV P4mA 320mV

Thanks for the tip.

I updated the spreadsheet with a note, and removed the column that was confusing (just one of my experiments). -- ~R~ 72/73 de Rich NE1EE The Dusty Key On the banks of the Piscataqua

Actually, it's -20 x log10 (0.016) -- ~R~ 72/73 de Rich NE1EE The Dusty Key On the banks of the Piscataqua

Hello Roger, I try to have zero extension after the calibration planes (at least for 30MHz). So I use SMA connectors with open, closed, load (2-100ohm SMD in parallel) and through pins, see:

Check the SD card with (for example): https://h2testw.en.lo4d.com/windows Cheers, David -- SatSignal Software - Quality software for you Web: https://www.satsignal.eu Email:

It is recommended in the NanoVNA beta group that you power off to install or remove SD cards. IIRC some cards have been permanently damaged by "hot swapping". Roger

I have found (-H4, v4.3, DiSlord firmware v1.2) 1. I can hot swap the SD cards. No mounting, unmounting. I don't rush the write ops, but it is clearly done when it says it is. 2. I tried a newer 32 GB

I normally use the NanoVNA without the computer connected, and it matches well with my MFJ analyzer. When connecting to the computer today, I saw a similar issue when measuring an HF multiband

Version 1.1; Build Dec 21 2021. Verbatim 16 GB micro SD card. First formated Fat 32 via Windows 10 system. Wouldn't write from NANO. Next installed "SD Card Formater" on my desktop. Did a full Fat 32

Is the MFJ running on batteries?? Or a wall wart? Personally seen erroneous readings MFJ on wall wart, batteries are better. Then check adapter/cable for NanoVNA. Something is different in the RF

1. I cannot get "VSWR" to start / display anything reasonable , BUT "return loss" works as expected 2. How do I delete "marker" - say delete all markers? (I hate clutter) 3. moving mouse wheel zooms

The calculations for S21 series method are based on the Port1 (Ch0) and Port2 (CH1) impedances Zref being 50+j0 (not |Z| = 50). See attached equations. I used the 15 cm Cable that came with my -H4 and

Another case which will result in varying readings is a vertical antenna (e.g for a handheld) which is lacking a ground/counterpoise/ground plane/feedpoint choke; then the measurement system becomes

In some applications a square wave can be beneficial. Many mixers will perform better with a square wave LO than with a sinusoidal one. 73, Don N2VGU