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The SARK-110 is an antenna analyzer. I know it's a tiny point of distinction, but one nonetheless.

Unfortunately I cannot reproduce the problem, I set the range 450-490, 460-475. Calibrated, everything went smoothly. I later added a reset of the generator cache when starting the scan, maybe this

Alan, Why not trying to increase the span by 10mhz at a time to see where you get correct readings? That may help to narrow down the issue.? On Thu, 1 Oct 2020 at 10:10 AM, Alan “W2AEW”

Hello DiSlord, Thank you for the reply. I tried this procedure, and still have the same problem. I am not sure why. When I run through the calibration procedure over a wider span, it works

This is calibration issue. Reset device (off/on), load your calibration slot, and not made calibration reset, do only ISOLN/THRU after press done and save to slot. PS Firmware allow made apart

Does S21 look "normal" in uncalibrated state?

Perhaps an open cable or a failed connection during calibration?

I just tried the previous version - same result - S21 very noisy, sitting well above 0dBm with both ports open. Strange.

Same version. Judging by the git logs, DiSlord regularly merges changes from H into H4 so the basic functionality should be the same. [email protected]> wrote:

Same firmware? I believe the 2.8" unit has a 2.8" nanovna-H has an stm32f072cbt6 with 16kbytes of RAM vs an stm32f303cct6 on the nanovna-H4 with 40kbytes of RAM. And that for this reason the 2.8"

That is strange. Try the previous version ( https://github.com/DiSlord/NanoVNA-D/releases/tag/1.0.38) wrote:

I did, several times. Reset and re-ran calibration over this narrow range, some result. If I use a cal over a much wider span, and rely on cal interpolation, it works. Just not if I cal over this

Used your settings on a 2.8" unit, same firmware. Everything works as expected. Did you try to reset the calibration? wrote:

I updated my -H4 with Dislord's latest v1.0.39 firmware, and for the most part it looks great - up to 401 points, adjustable measurement BW, etc. All good. However, I have a strange problem with it

You find hints in the manual in the Wiki. The RED led ( i think ), has the behavior of a USB power pack LED, because there is a power-pack chip (IP5303) in the Nano to charge the battery and a "watch

Let me clarify that scattering parameters expressed as return loss S11, imply a power measurement. Ken

The formulas were taken from G3TXQ spreadsheet so compare with it? If you are good with excel/libreoffice graphs you can mark the regions where Z > 2K and R > |X| (the desired resistive choke) same as

Well, at last I've loaded my .s2p into excel and generate a graphic of my choke.. I would like to know how reliable is the whole thing..... Federico ik3umt

If the characteristic Z of the system is the same thru out, it matters not if you use 20log(Va/Vb) or 10log(Pa/Pb). Where the voltages or the powers are known.

Just make sure that you use the second version where ATAN2 is used for phase calculation.