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For a choke we want to determine high im[edance values and the one port is not really good in that (low accuracy). See here for some background:

Solved : just change line thickness and point size before closing window

Hi all, I don't know if this has been posted before, but I'll give it a try. I use the software on my Mac and all seems to run. But when I go to 'Display Setup' and check 'Show lines' the software

Thanks, just been reading the late G3TXQ articles. Very useful. He said a one port measurement is no good. Surely if I terminate the choke with a r ohm resistor , I can measure R + j X that way and

There are two methods to Convert S21 to Z. The series method is used for "high impedances" and the "shunt method" for low impedances. These are built into the latest firmware for H/H4 and in NanoVNA

I posted an updated version of this doc, which is the same content as the older doc, but because it contains more operational information, I renamed it to a user manual. I thought that I had sent a

The following files and folders have been deleted from the Files area of the [email protected] group. * /user manual and menu maps/nVNA-H4 v4.3_MS, firmware 1.1, Menu Items & Descriptions

Yes, disconnect all power for a while. The ultimate and first try to fix ANY and EVERY computer that I know of. Even my wife has learned that. Dave K8WPE David J. Wilcox’s iPad

Thanks, Roger. I'll give that a try. Perry [email protected]> wrote:

You might find this useful...I did it with real data from my -H4 and my EF 40 m wire. You can make a copy of this spreadsheet so that you have a backup. Then open it, and start a new spreadsheet.

Great thanks. Any body has a spreadsheet then to convert S21 gain and phase data into impedances?

I find the TDR method to be quite accurate. NanoVNA Saver works quite well. However all these methods need an accurate Velocity Factor (VF) input. The VF of an actual cable will often differ by +/- a

I can't remember where I got it. It might have been in a previous post in this group. Roger

Just click "Display Settings" and then select "Show Lines" Then select your line width and dot size. See attached screenshot. To import into Excel just create a .s1p or .s2p Touchstone file. Import it

Save it as a s1p or s2p file.? While not precisely Excel, they are close enough - use convert data to columns Here's a sample # HZ S RI R 50 50000 0.3278822061648298 0.0003739103343315503 248313

Make sure that "Show Lines" is checked in the Display Settings.

Does anyone know to improve the plots? They look faint and grainy. I tried averaging over several sweeps to no avail. They are barely visible on screen. Also how do I export the data file to Excel

Nice chart, Roger. What is the source? If I were to guess, I would say from a professional VNA unit. Thanks Brian D KF6BL

One thing you might try is to charge the unit overnight. Then open the case and then disconnect the battery by taking the connector off the board. Wait a minute or so and then re-connect the battery.

On Sat, May 28, 2022 at 09:02 AM, Brian Donaldson wrote: > > I also notice that by changing the STOP frequency, the value of length > changes. Minor but still there are changes. Do you have a