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Re: what does your NanoVNA circuit board look like?
Hugen,
I noticed that the accuracy of the touchscreen is not the best. I was going through the NanoVNA GitHub source and I saw a few calibration and self test routines in control.c . Do you know how to get to them or do you need to recompile the code with a runtime flag to enable? Thanks |
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Re: NanoVNA software on windows 10 x64?
On Wed, Jun 26, 2019 at 01:47 AM, <f4htq@...> wrote:
There's no plan for open source nanovnasharp in the short term. The 900M firmware will comply with the gnu License and open source after fixing some errors. |
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Anyone pushed the available firmware versions to their unit yet? Comments?
I've pushed both the nanoVNA_900_AA_20190611.dfu and nanoVNA_900_ch_20190505.dfu firmware to my 'Gecko' VNA and have found that they were compiled by gen111.taobao.com as that URL appears on the startup screen under the nanoVNA name.
I would be interested to hear if any others have pushed any of the firmware found in the download archives mentioned previously in this group. I've noticed that they don't always start up and just hang at the boot screen. Comments? |
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Re: what does your NanoVNA circuit board look like?
I would check ALL the solder joints.
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I thought I got ripped paying $75 for mine, but maybe a better manufacturer :-) It's all Chinese junk On 6/25/2019 2:24 AM, Dom Baines M1KTA via Groups.Io wrote:
Thanks Frank, I will take a look at the usb socket soldering. Perhaps that is the issue? |
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Re: what does your NanoVNA circuit board look like?
I connected it to a USB cable and turned it on, nothing. Pulled the USB and there it came up. Plugged the USB in again, and was able to get it to connect to Nanovna sharp (v1.20). Running it in auto update, I can see my tunable filter move without having to hit "get data"
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On 6/24/2019 3:10 PM, Dom Baines M1KTA via Groups.Io wrote:
[Edited Message Follows] |
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Re: what does your NanoVNA circuit board look like?
I hooked mine (White Gecko) to a tunable filter (63 to 125MHz) and I was impressed with what I saw S21 and S11 looked lit was when I swepted it at work. I was recently?? laid off (retired?) and want to do some duplexer tuning, and needed something to do it with . I have a sweep gen and hybrid coupler (plus detector) but you cant get return loss
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I think it is good enough for most ham work. I'll have to look at some of my antennas On 6/24/2019 3:10 PM, Dom Baines M1KTA via Groups.Io wrote:
Tried the gecko version with various different USB cables that do work with phones and other electronics and do see the board either under Linux or Windows. |
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Re: what does your NanoVNA circuit board look like?
It will detune hi freq stuff. Having worked in RF from the KHz to GHz, I know it effects sensitive circuits plus it picks up all kinds of crap. Better off cleaning it off with alcohol then blowing it off. If you dont plow it off, the stuff just moves around the board. I always soaked in 99% IPA (industrial), but above 70% is OK. You can get some 91 to 98 or so at some drugs stores
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On 6/24/2019 3:05 PM, Larry Rothman wrote:
Yeah, thinking about it, you don't want any type of organic material around high freq circuits. |
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Re: what does your NanoVNA circuit board look like?
Tried the gecko version with various different USB cables that do work with phones and other electronics and do NOT see the board either under Linux or Windows.
I might try with an ICSP header. So that is a big fail for me. The flux HAS to be cleaned off this is basic QC really. It has started to collect dust/fluff anyway even though has not seen much more than the bench. 72 Dom M1KTA |
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Re: what does your NanoVNA circuit board look like?
If the flux is water soluble it definitely must be cleaned off or it will corrode the board.
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I worked for a company that partially built their boards to be finished later and they used water soluble flux cored solder. All of the boards were scrap after 3 weeks. If the flux is no clean then the flux does not have to be removed. It is better if it is removed, but, not absolutely required. Glenn On 6/24/2019 1:30 PM, Larry Rothman wrote:
A quick comment on the flux residue - it doesn't have to be cleaned if it's the water-soluble type. It looks bad but it's harmless. --
----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license" |
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Re: what does your NanoVNA circuit board look like?
I have worked in this industry for long enough to know it does make a difference. The flux attracts moisture and can change parameters. I always use IPA (not the beer) to clean the board off. Be careful on the display some are not sealed, and alcohol can screw it up
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On 6/24/2019 1:30 PM, Larry Rothman wrote:
A quick comment on the flux residue - it doesn't have to be cleaned if it's the water-soluble type. It looks bad but it's harmless. |
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Re: what does your NanoVNA circuit board look like?
That is the one I have, and it seem to work OK
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On 6/24/2019 12:13 PM, Dom Baines M1KTA via Groups.Io wrote:
I found that the white version with a gecko on it was a very bad clone. |
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Re: what does your NanoVNA circuit board look like?
See attached screen shot. I purchased my white gecko from 2012moon816. It
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included the battery. On Mon, Jun 24, 2019 at 10:30 AM Larry Rothman <ac293@...> wrote:
A quick comment on the flux residue - it doesn't have to be cleaned if |
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Re: what does your NanoVNA circuit board look like?
A quick comment on the flux residue - it doesn't have to be cleaned if it's the water-soluble type. It looks bad but it's harmless.
Brass shim should work for the shields, but make sure it's not too thin or you'll see something akin to microphonics if the flat surface is able to vibrate. When I worked at Motorola, we had to mould stiff ribs along the surface of the synth VCO covers to prevent issues caused by even the smallest vibrations. If you have a local junk/surplus store see if they have any cellphones/pagers/radios that you can pull some shields off of. Just heat the board up with a heat gun and the shields fall off. As for the battery, I think the ones that came with one, have it sandwiched between the back cover and the PCB. Maybe some can confirm? |
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Re: what does your NanoVNA circuit board look like?
Larry,
Sadly no HT's here but I am guessing some brass shim etc or tin plate screens would help. Still not convinced about the top end freq wise though with SA602. The unit wasn't that expensive so might just bite the bullet and clean the board and add the headers etc. Linux user but that the usb bootloader is present for you at least that would seem helpful for USB programming. If programming via ICSP I am sure the PCB had where that push button should go when programming. The normal process would be disconnect the USB and power only through the ICSP headers though? The recent PC side software doesn't seem to have a Linux version so I guess the python scripts will be the answer but might need to figure out the connection port first. Driver? 72 Dom M1KTA |
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