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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

I made a simple little video about using the Nano as a spectrum analyzer... Might be of interest to some. Also showing off my RF test bench ;-) https://www.youtube.com/watch?v=ZiN6hv3do04

Dear Clifford! First of all - please acept my apology for making a typo in your name (in my previous post). That's great! I wish it would be implemented in the NanoVNA-H ref.3.5 and its' -H4 sister

Why post rants directed at a single person publicly? Ragcheving has it's place and this board is likely not it, similarily to some folks stsrting to chew the rag during some technical net and then

OK,? I think it won't because it has a different CPU, maybe your updates will be in DiSlord future firmware, thanks anyhow. Op 15-7-2020 om 14:25 schreef OneOfEleven:

It would if I had a H4 to test on Jos, but I don't have one so I can#t reliably compile it for the H4 unfortunately. It would be easy enough for those out there with a H$ to make it H4 compatible if