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Git Hub shows 0.0.3.6-rc2 is the latest version of NanoVNA Saver Should I be staying with the 0.0.3 version? or moving to the 0.3.3.6 version? KEoZUW John

I'll note that unwanted shunt-capacitance can result in errors (that increase in frequency) when measuring large impedances using "configuration 3" in the Copper Mountain doc. This same shunt

Thanks Darrell I'll take a look. I've been putting off designing one for myself so this may save me some time...

FYI - In the current source code the internal on-chip vbat divider is always enabled. There is an option where the divider is switched on/off before/after the actual vbat measurement via ADC1_17

This measurement technique was addressed many months ago in a prior thread. https://coppermountaintech.com/measurement-of-electronic-component-impedance-using-a-vector-network-analyzer/ You can now go

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The Vbat, at least what I see in the sources for H4, is being sampled such the Vbat voltage divided by 2 (internal on-chip divider, most probably disconnected when not in use) is converted via the ADC

Just FYI, I designed a protective case for the H4. It is a bit oversized to allow additional SMA connectors to be left on to prevent abuse to the connectors attached directly to the circuit board. The

Dear Clifford, I've studied Dunsmore's publication (thanks for the link!), as I can understand it is more about the way to enhance the U7's input (I'm referring to the 3.4.2) network, namely, the

There have been several threads in the various nanovna forums about the value of applying engineering to these devices. For the record: You statements are incorrect, except, perhaps where you imply

Nice write-up of the measurement problems. Rings a few bells. Now with the nano, I measered several resistive loads (47 to 10k) using S11 en S21 in the HF range a few weeks ago. For high impedance

Excellent! Thanks very much, Pete. 73, Jeff, k6jca

Hi Jeff, Here's the paper: Showed up below as Challengesandsolutionsforimpedance When I did the complex algebra it was a good refresher. 73, Pete

It was a bug releases between v0.3.0 and v0.3.2 fixed in v0.3.3 https://github.com/NanoVNA-Saver/nanovna-saver/issues/202 73 Holger, DG5DBH

This depend from calibration and calibration set, how good it made. And possible you made calibration and use cable, but then made measure not or different.

@DiSlord: while using H4 with v0.8.4.5fw (most stable pre-SDcard version here) I see data outside the Smith Chart (both on the H4's LCD and in nano-saver as well). See below the picture. Is that ok?

I got them a year ago. Links & vendors change...

Just search on Ali...

Have you got links for the generator & attenuator?

You should understand NanoVNA can use as SA, but it one point bandwidth (on old firmware as in your variant) ~1kHz so you can see spectre in 100*1kHz = 100kHz span (can be bigger but then you can get