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Re: Saving .s1p, .s2p, and Screenshots Directly from the nanoVNA-H4
The 32KHz xtal is only needed if you want a real time of day clock on your unit for accurate dates on data saved to the SD card.?
Without the xtal, you'll need to turn on the Nano, set the time using console commands and then use the sdcard.? Many older PC motherboards use the narrow 32KHz xtal and that's where I got mine from for my units. They work fine and old junked motherboards are easy to come by and usually free.? On Thu., 25 Mar. 2021 at 4:02 p.m., Fred, W9KEY<fred.schwierske@...> wrote: So just to clarify - are the new H4 units from R&L Electronics presently shipping with all required hardware to use a (user supplied) microSD card? ? 1)? Or must the above discussed 32KHz crystal first be installed? ? 2)? And do units currently shipping from R&L have cases which include the card slot, or does the user have to cut an access slot? |
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Re: Pitfalls of measuring components with the NanoVNA
#measurement
So does mine but it still was a clone, nothing major,
few resistors where there should be none and some wrong component values. Only way to be sure is to buy from Hugen store. On Thu, 25 Mar 2021 at 19:15, jmr via groups.io <jmrhzu= [email protected]> wrote: It was a long time ago but I did try and buy the Hugen version with the |
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Re: Saving .s1p, .s2p, and Screenshots Directly from the nanoVNA-H4
I bought my H4 several weeks ago and it did include the microSD card holder attached to the PCB. However, the case did not have a slot cut in it for access. I'll do that myself if I decide to use it.
I don't know anything about the crystal but I don't think it is needed unless you want to have accurate date/time stamps on the files being saved. -- *Don - W3DRM* |
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Re: Saving .s1p, .s2p, and Screenshots Directly from the nanoVNA-H4
So just to clarify - are the new H4 units from R&L Electronics presently shipping with all required hardware to use a (user supplied) microSD card?
1) Or must the above discussed 32KHz crystal first be installed? 2) And do units currently shipping from R&L have cases which include the card slot, or does the user have to cut an access slot? |
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Re: Pitfalls of measuring components with the NanoVNA
#measurement
It was a long time ago but I did try and buy the Hugen version with the blue PCB. I just checked and it does say nanoVNA-H v3.3 on the blue PCB and the case and lettering are the same as the Hugen version. I'm not sure if the Hugen version is a clone but at the time this seemed to be the one to buy.
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Re: Pitfalls of measuring components with the NanoVNA
#measurement
AFAIK all open frame versions are clones.
I have one that I have updated to the latest version of the schematic, works ok but there were some really weird component values originally. It would not hurt to check yours. On Thu, 25 Mar 2021 at 01:14, jmr via groups.io <jmrhzu= [email protected]> wrote: I'm fairy sure my nanoVNA is an H as it had H firmware on it when it |
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Re: Pitfalls of measuring components with the NanoVNA
#measurement
Ken Moorman
There are at least two members of this group who are confused about the NanoVNA-H4¡¯s ability to write sp and screenshot files to micro-SD cards and what needs to be done by us to accomplish this ourselves, if in fact it is possible, with the current hardware and firmware. From the various answers we have gotten it seems like some people have been able to do what we are questioning, but the issue is: How did you do it and what, if any mods need to be done to the board? I believe that both of us have been using the latest version of firmware, v1.50, and Rui has plugged the a card into the slot but was not able to get it to be written into. If you have gotten this very useful function to work for you please give us enough information to allow us to do the same. Thanks.
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Ken, NU4I Sent from my iPod On Mar 25, 2021, at 08:58, Jos Stevens <jrs@...> wrote: |
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Re: Pitfalls of measuring components with the NanoVNA
#measurement
You need the Xtal only when you want to have the date/time displayed correctly.
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Jos Op 25-3-2021 om 09:43 schreef Rui Valente: Hello |
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Re: Pitfalls of measuring components with the NanoVNA
#measurement
Hello
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I installed the latest version 1.0.50 and i solder a new SD card slot...them i tested 3 different sd card and different capacities but anything happen in the menu sd card (no error message) after i remove the cards and theyare empty...is necessary install the 32khz cristal ? I don't install yet... Thanks in advance... 73 CT2GGX A quinta, 25/03/2021, 03:59, DiSlord <dislordlive@...> escreveu: I fix one problem in DSP code (for H version) in 1.0.50. |
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Re: Pitfalls of measuring components with the NanoVNA
#measurement
I fix one problem in DSP code (for H version) in 1.0.50.
H4 use DSP instruction and more faster/accurate in calculations DSP code for H: do{ int16_t ref = capture[i+0]; int16_t smp = capture[i+1]; int32_t sin = ((int16_t *)sincos_tbl)[i+0]; int32_t cos = ((int16_t *)sincos_tbl)[i+1]; samp_s+= (smp * sin)/16; samp_c+= (smp * cos)/16; ref_s += (ref * sin)/16; ref_c += (ref * cos)/16; i+=2; }while (i < length); Yes /=16 used for prevent overflow on int32 values Code for H4: do{ int32_t sc = ((int32_t *)sincos_tbl)[i]; int32_t sr = ((int32_t *)capture)[i]; // int64_t acc DSP functions acc_samp_s= __smlaltb(acc_samp_s, sr, sc ); // samp_s+= smp * sin acc_samp_c= __smlaltt(acc_samp_c, sr, sc ); // samp_c+= smp * cos acc_ref_s = __smlalbb( acc_ref_s, sr, sc ); // ref_s+= ref * sin acc_ref_c = __smlalbt( acc_ref_c, sr, sc ); // ref_s+= ref * cos i++; } while (i < length/2); It use int64 accumulator (it aslo used for accumulate for average/bandwidth) and one instruction for calculate (H can`t fast processing measured data in int64) On H4 i can get up to - 100 - 110dB dynamic range on measure S21 in 1 to 100MHz |
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Re: Saving .s1p, .s2p, and Screenshots Directly from the nanoVNA-H4
Larry,
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Sorry. I meant capacity. I have a 32MB microSD card that I will try. Thanks, Mike N2MS On 03/24/2021 8:12 PM Larry Rothman <nlroth@...> wrote: |
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Re: Pitfalls of measuring components with the NanoVNA
#measurement
I also tried a very harsh test with the nanoVNA. I put two 820pF PPI 1111 caps in series and compared the ESR to just one 820pF PPI cap. In theory, the ESR should double and the Q curve should be the same.
The result below is quite good but this is really stretching the limits of any VNA. The result for two caps in series isn't quite double the ESR but it looks close enough. Note that I'm not doing anything 'clever' with calibration offsets or fudge factors to get these results. I measured the OPEN and SHORT delays on a lab analyser and I use this to correct any slight error in the cal kit. The difference betwen open and short is only about 2ps even uncorrected. So there is no secret sauce or fudgery involved in the setup I'm using. I did note that the edelay 'delay' needs to have a x2 factor included (to give the correction delay I expect) and I'm not used to seeing this. |
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Re: Pitfalls of measuring components with the NanoVNA
#measurement
I'm fairy sure my nanoVNA is an H as it had H firmware on it when it arrived. It was made in 2019 and is the open frame 2.8" model. At the time I did try and buy from a proven seller to get a well made example with the screens and battery fitted.
I didn't keep any notes when I experimented with newer firmware but I think the newer versions of FW that I struggled with were the Dislord 1038 FW and the (latest?) oneeleven FW. Both of these gave much noisier results and I do remember trying different bandwidths. I may have missed something though. I didn't spend much time with either version so maybe I should have given them a better chance. I found that all of the Edy555 versions of FW that I tried seemed to give a clean trace on a 100k and a 1R resistor test. I tried quite a few right up to version 080. However the two most recent versions 070 and 080 seemed to be prone to freezing up and I think this was caused by my own PC tools that I use to communicate with the nanoVNA. I think 070 and 080 have some of Dislord's code in and I'm fairly certain that both these versions were as good as earlier versions in terms of the RF performance. It was just the freezing up issue that stops me using these newer versions. At the moment I'm running 060 FW and this is quite old and it doesn't have as many features. However, it seems to run reliably with my PC tools. |
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Re: Saving .s1p, .s2p, and Screenshots Directly from the nanoVNA-H4
Oops, for size, do you mean capacity or physical?
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It takes an microSD card also known as a TF card of any capacity? I've used a 32GB and 32MB without any problems On Wed., 24 Mar. 2021 at 7:10 p.m., n2msqrp<mstangelo@...> wrote: I just got a new H4 form R&L Electronics and it has the SD receptacle. What size SD card does it accept? Mike N2MS On 03/24/2021 3:26 PM Larry Rothman <nlroth@...> wrote: |
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Re: Saving .s1p, .s2p, and Screenshots Directly from the nanoVNA-H4
I just got a new H4 form R&L Electronics and it has the SD receptacle. What size SD card does it accept?
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Mike N2MS On 03/24/2021 3:26 PM Larry Rothman <nlroth@...> wrote: |
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Re: Saving .s1p, .s2p, and Screenshots Directly from the nanoVNA-H4
See this topic (Now firmware can autodetect installed quartz, if no run LSI mode, time tick only while device power on)
/g/nanovna-users/message/14447 |
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Re: Saving .s1p, .s2p, and Screenshots Directly from the nanoVNA-H4
Ken Moorman
Thanks for the information, Larry. Does the clock have to be working for the screenshot and s1p, s2p to be saved? Or do I just have to plug in a micro-SD card to get it to work? I guess the saved files could be given a time stamp from the clock instead of naming them. Have you already made these mods to the board yourself? It sounds like the crystal (is it a 32khz clock crystal) is mounted on the board edge rather than tacked onto the MCU as I had been thinking. That would certainly make the mod a lot easier! If you have any pictures or other info that would be useful I would really appreciate it.
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Ken, NU4I Sent from my iPod On Mar 24, 2021, at 15:26, Larry Rothman <nlroth@...> wrote: |
W7DRM - Don
Fred, W9KEY
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