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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

Thanks. How do you explain this: MFJ: 1.8 NanoVNA not connected to laptop via USB-C: 2.7 Forget about the laptop, the USB-C cable, the NanoVNA Saver app .. but just unplugging/plugging the coax among

When I have this problem it’s usually because I’m getting RF coming back on the shield, I put a couple of clamp on fairite chokes on or coil the coax and I get good readings again. Just an idea.

This has been addressed a number of times in this group. If you cal without the USB cable connected and then connect it for a measurement of your unknown, this is quite expected. The case of the VNA

Very happy you were able to resolve your issue73's

Possibly a ground loop thru the USB-C. Try running the laptop from its battery, no recharging PS. WA0VYU Sent from the all new AOL app for Android On Mon, Jun 6, 2022 at 1:19 PM,

Hi, I have a MFJ-259B antenna analyzer and now also a NanoVNA-H, along with the NanoSaver App. I get inconsistent VSWR readings with both devices: MFJ: 1.8 NanoVNA not connected to laptop via USB-C:

Thanks Chris, finally figure it out it was the driver all the time.

Thanks for Replying Fred I am using a NanoVNA-H Finally figure it out it was the driver all the time.