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Thanks Jim! Op di 7 jun. 2022 om 22:16 schreef Jim Lux <jim@...>:

On 6/7/22 1:14 PM, Jim Lux wrote: > On 6/7/22 10:30 AM, Victor Reijs wrote: >> In the meantime I found a document: >>

https://www.rfmentor.com/sites/default/files/NA_Error_Models_and_Cal_Methods.pdf "Network Analyzer Errro Models and Calibration Methods" by Doug Rytting of Agilent (at the time))

If I work really hard, and adjust the screws, I can fins a spot where the screen seems to work. But I still can’t get the control Knob to work at all. Is there an internal connector or ribbon

I have an H4 with latest DiSlord 1.2 firmware. But all of the SD card support firmware was done by DiSlord, and was introduced several versions ago - and it uses the same SPI interface on all of the

Stan: Which NanoVNA did you have and which software version? I assume this makes a difference regarding SD card compatibility?

In the meantime I found a document:

Figured this could use its own thread. https://www.convict.lu/pdf/ProdManualSDCardv1.9.pdf https://images-na.ssl-images-amazon.com/images/I/91tTtUMDM3L.pdf

You can use up to 32 GB. Finding out which cards are SPI compatible is another thing. You just have to search. Not sure how to find out for most. I tried to find out for SanDisk, and had no success.

I don't know of an easy way to see the SPI compatibility of a card. But these Patriot cards work (see photo). I purchased them inexpensively on Amazon.

1.6 SD CARD SNP files and screen images are saved with names VNA_yymmdd_hhmmss, and extensions of s1p, s2p, or bmp. Although it seems that the SD cards can be hot-swapped, the NanoVNA beta group

Which cards are proven to work with the NanoVNA-H? I don't want a collection of 16GB cards that don't work.

Could you please provide a link to the "Duffy method" of determining Zsource? Roger

Hello Kurt, Do you have a definition of this 10/12 term correction method? I am interested in understanding it. Thanks. All the best, Victor

Use a different card. Some manufacturer's cards just don't support the protocol used by the nanovna firmware. See this post: /g/nanovna-users/message/26892 [email protected]> wrote:

In Expert settings there is the reference frequency you may change to your like, so I had to decrease that value a little bit (by 45 units afaik) such I now read 300.00000 an my counter.

Below are the test results from my 16 GB SD card... Warning: Only 14753 of 14754 MByte tested. Test finished without errors. You can now delete the test files *.h2w or verify them again. Writing

Here is the Zsource I derived (using the method of Owen Duffy). I used one 100ohm SMD resistor (99ohm using DVM) soldered between two female SMA PCB connectors: [image: afbeelding.png] Zsource indeed

Hello ROger, I check again and if I use a Zsource of around 43ohm and a Zload as measured using the S11reflect of port2. Using that Zsource gives me more or less comparable graphs for the differently

that's a bit less than 2 ppm. That's pretty good for an inexpensive TCXO.? If you want to hack, you might be able to put a voltage on the trim input, but that could actually make things worse. You're