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It sounds like you are trying to measure the performance of an "Off Center Fed Dipole" (OCFD), multi-band antenna. The typical resistive component of an OCFD feed-point is about 200 Ohms instead of 72

(Sorry for replying to old post, just came across a datasheet for Mix 61) You might still look at three windings of Mix 61: https://www.fair-rite.com/product/round-cable-emi-suppression-cores

I took a look at the SDRKits presentation again, and all the sweeps stop at 60MHz. That's a clue. The calibration resistor looks like metal film to me. I guess the only way to test limits of the

No problem at all, Ken. Actually you draw my attention to LibreVNA, and I'm trying to figure out how to purchase it. (Import taxes here are huge, and make the prices prohibitive. Let's see.) Thanks

Sorry about that. I got two search results confused. The LibreVNA does look rather interesting if you don’t need a built in screen though. Ken K6MR Sent: Sunday, October 31, 2021 23:16 To:

Many thanks for the suggestion, Ken. LibreVNA-GUI.app seems to be very good and runs well on macOS. Unfortunately, it requires the LibreVNA (hardware), which I don't have - I have the NanoVNA-H4 only.

Sonnet Lite. See my post under Ferrite Identification /g/nanovna-users/message/25242

You might do marginally better with 43 material. 31 material really shines on 160 and 75/80 meters. 43 is a bit better on 14 MHz on upward. But it's not worth the investment in buying a 43 core just

There is a osx version listed on his GitHub page: Releases · jankae/LibreVNA · GitHub<https://github.com/jankae/LibreVNA/releases> Ken K6MR Sent: Sunday, October 31, 2021 13:44 To:

yes, I have, even though I missed to mention :) That is how I measured that antenna has resonance (reactance crosses zero), and real part (resistance) is like simulation (4NEC2) shows. But also wanted

Hello, I tried NanoVNA-App from OneOfEleven and found it excellent. Unfortunately, it runs on Windows, only. Does anyone know whether there is a compiled version for macOS? Thanks

Here is the tutorial I lost from Fair Rite: https://www.fair-rite.com/videos-presentations/ Here is the app that calculated the ?i from the video: https://www.fair-rite.com/toroid-calculator/ You can

1. There is an excellent presentation on how to use the center part of the board for test measurements/ prototyping by Tom Baier DG8SAQ. You can view/download it here >>

The SDR-kits and clone jigs work well at low frequencies but the stray capacitance and inductance limits its usefulness for testing components beyond HF. The lead length of through hole parts becomes

You're doing all the right things. However, once the common mode choke (CMC) is placed inline, you must calibrate the setup to measure at the "antenna side" of the CMC. Have you don't the cal there?

Boy, would the superposition theorem have scrambled you brain.

Ok, struggling with terminology here, so bare with me for a sentence or two :) Question is probably more appropriate for "antenna building" group, but this is tighly related to measuring with nanoVNA

Nice youtube video. The in the video used Zplots does not work with the OpenOffice spreadsheet. Is there an alternative for Zplot which will work in OpenOffice? 73,Kees Op 31-10-2021 om 16:17 schreef

And this one would involve even less length of cabling, SMA to screw terminal adaptor. https://atlas-scientific.com/connectors/sma-screw-terminal/

See https://www.youtube.com/watch?v=KmKQibSDzqM This is a Fair-Rite engineer showing how to measure a ferrite core. At 48 seconds he shows a clever test fixture and describes the calibration. 73,