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It's a two-dimensional boundary separating two three-dimensional regions, hence "plane". Phil M1GWZ

There are actually two charts as you can see overlaid, usually in two colors to assist reading. The chart on your vna is the Z plane chart. After rotating it 180 degrees it becomes an admittance

In the case of waveguide, where scattering parameters and such were originally used, there is a "plane", cutting across the waveguide.? One hopes, of course, that you're using waveguide that supports

I'd never have thought to use jumpers at hundreds of MHz, assuming they'd be too reflective. Though I admit, I've done little work at hundreds of MHz. Nice work! I see what appears to be quite small

I look at the calibration plane as dividing electrical space in two with the measurement system on one side and the DUT on the other. The calibration of the measurement system occurs at the plane.

I might add, waveguides fall under the same class and the use of a plane across the flange of the guide is apparent.

In some calibration systems like TRL, using transmission lines, thru, reflect, line... The cal pieces actually are a PLANE sheet, the various line edges which serve as the cal junction. So not a point

As far as I can tell, calibration is done at a single point in a circuit. A plane suggests two dimensions, and that anywhere on that two dimensional object, the calibration is the same. But everyone

Success! Removal of the FM9688 and adding the jumper did the trick. The nVNA starts up every time. I'm using an external battery pack with it. Thanks! --Al

You can try to remove the FM9688 first in order to confirm if it is caused by a fault in the FM9688.

Hugen, thank you for your reply. Do you think it's worth trying to replace the FM9688 IC? I have some experience and equipment to work on SMD and that chip has enough spacing of its leads to make it

Thanks for the suggestion. I tried it, but all I get is a more dramatic flickering of the display at a slower rate. --Al

It looks like the power IC is malfunctioning, so if you are willing to work without the battery, try removing the FM9688 and shorting pin4 and pin8 of the FM9688 location on the PCB.

Try disconnecting the battery, disconnecting the USB cable, powering it on to discharge any caps, and then boot it with just the USB as power supply? Battery might be getting soft... 73, Willie N1JBJ

Hello all, I'd had this nanoVNA-H for a few years, h/w v.3.4, and it's had this startup trouble for a long time. At power on, the screen lights up, a blank screen flickers as if trying to boot and

circle is the series circle" .... or is that back-to-front?? I've read it exactly this way in another article too. And in some other article I found it the other way around. IMHO I think it's just a

Hi, Re this article is Point 3, Page 3 correct ?? ie "The right/constant resistance circle is the shunt circle, and the left/constant conductance circle is the series circle" .... or is that

Hi Miro, Yes, you need 2 jumpers to engage a section, but only 1 to bypass it. It is more convenient to keep the 2 jumpers together, this way you switch the section with a single motion of turning the

SimSmith is a very powerful application. It's free and can be accessed at: http://www.ae6ty.com/smith_charts.html and an excellent tutorial specifically addressing SimSmith:

A nice document with a lot of good information.? The restrictions on impedance matching range in Figures 4 and 5 of the Abracon white paper are shown in more detail in Figures 5.57 and 5.58 of the