Well, unfortunately it appears I was sent a defective STM32F303.
I removed it and put the original F072 back and my Nano is working again.
I thought I might have a problem when I saw that the seller had wrapped shipping tape around the chip carrier to hold the F303 in place. So much for no antistatic precautions.
I'll have to see if the seller will send me a replacement, wrapped in aluminum foil.
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On Thursday, June 4, 2020, 8:34:24 p.m. EDT, Hugen <hugen@...> wrote:
Try this early test version, it can run on F303 without external crystal, there may be a lot of errors.
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Hello,
What I have not seen up to now is a *permission* problem fix with the access to the USB serial port (nanoVNA).
What to do:
# Add user to group dialout, for USB-Serial access.
$ sudo usermod -a -G dialout <user name>
# Reboot
$ groups
rudi adm dialout cdrom sudo dip plugdev lpadmin lxd sambashare vboxsf
# "dialout" must show up in the list.
73, Rudi DL5FA
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Re: ¡°Fixture In A Hurry¡±. And a Transformer.
Finger mistake
20Log(10)(1/67) = ¨C36dB
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-----Original Message----- From: Lee Sent: Friday, June 05, 2020 10:05 AM To: [email protected]Subject: [nanovna-users] ¡°Fixture In A Hurry¡±. And a Transformer. Although I got my NanoVNA back in ?February? I have not taken time to work with it much. I did purchase a bag with ?10? PCB edge mount SMA connectors and after yesterday¡¯s traffic about ¡°NanoVna Test fixture¡± decided it was time to get some PCB copper clad and a Dremmel and make up my ¡°Fixture In A Hurry¡±. See attached. I though what might be fun to test and the transformer I use in a HV power supply came to mind. It is a CoilCraft part number: FL2015-2LB I drove the secondary and measure the primary. Both primary and secondary I loaded with 50ohms shunt to ground. (Was the shunt a good idea?) Turns ratio 1:67 so, if I am operating the calculator correctly this should be 10Log(10)(1/67) = ¨C36dB I measured S11 and S21 with NanoVNA Saver. The S21 measurement way down at 50KHz. is about the ¨C36 predicted. Note the S21 measurement gets the saw tooths (sawteeth?) soon after 50KHz. +++++++++++++++ Lee Erickson Spectrum Techniques LLC. lee@...
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Weird! I tried get it working on my Windows PC, and everything seemed to be going fine. However, while using the calibration assistant built-in to NanoVNASaver, I had a similar crash due to pyserial. This was also with Python 3.7 instead of 3.8 that I have on my Linux box. Now I'm starting to suspect the firmware that I flashed last year, ttrftech version 0.5.0-1. Further experimentation needed.
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¡°Fixture In A Hurry¡±. And a Transformer.
Although I got my NanoVNA back in ?February? I have not taken time to work with it much. I did purchase a bag with ?10? PCB edge mount SMA connectors and after yesterday¡¯s traffic about ¡°NanoVna Test fixture¡± decided it was time to get some PCB copper clad and a Dremmel and make up my ¡°Fixture In A Hurry¡±. See attached.
I though what might be fun to test and the transformer I use in a HV power supply came to mind.
It is a CoilCraft part number: FL2015-2LB
I drove the secondary and measure the primary. Both primary and secondary I loaded with 50ohms shunt to ground. (Was the shunt a good idea?)
Turns ratio 1:67 so, if I am operating the calculator correctly this should be 10Log(10)(1/67) = ¨C36dB
I measured S11 and S21 with NanoVNA Saver.
The S21 measurement way down at 50KHz. is about the ¨C36 predicted.
Note the S21 measurement gets the saw tooths (sawteeth?) soon after 50KHz.
+++++++++++++++
Lee Erickson
Spectrum Techniques LLC.
lee@...
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Re: Rotted Link to NanoVNA-Saver on Wiki
Lee,
When accessing web links, if you find a dead link, go up one level to see if anything has changed.
If you look at
You will see there is a German and English folder.
Have a look in those folders and you will find the updated filename info.
I will update the forum wiki.
Cheers,
Larry
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On Friday, June 5, 2020, 9:20:58 a.m. EDT, Lee <lee@...> wrote: I am trying to come up to speed with my NanoVNA and the NanoVNA Saver software on my own (not asking every single question on the forum). I have installed NanoVNA-Saver and connected to my instrument but need instructions. Regarding the wiki at: /g/nanovna-users/wikiThe link on getting started with NanoVNASaver goes to a message with a link that has rotted ? ? Getting Started (NanoVNA-saver Version 0.2.0) by Gunthard Kraus, DG8GB ? ? /g/nanovna-users/message/7663The rotted link: ? ? < At this moment this is my stumbling block to getting further with NanoNVA Saver. What should I do? Lee Erickson
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Re: Rotted Link to NanoVNA-Saver on Wiki
Update.
Still no luck finding the article. The way back machine had some of his information but not on the NanoVNA-Saver.
Gunthard Kraus looks to have had some nice work.
Lee
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-----Original Message----- From: Lee Sent: Friday, June 05, 2020 9:19 AM To: [email protected]Subject: [nanovna-users] Rotted Link to NanoVNA-Saver on Wiki I am trying to come up to speed with my NanoVNA and the NanoVNA Saver software on my own (not asking every single question on the forum). I have installed NanoVNA-Saver and connected to my instrument but need instructions. Regarding the wiki at: /g/nanovna-users/wikiThe link on getting started with NanoVNASaver goes to a message with a link that has rotted Getting Started (NanoVNA-saver Version 0.2.0) by Gunthard Kraus, DG8GB /g/nanovna-users/message/7663The rotted link: < At this moment this is my stumbling block to getting further with NanoNVA Saver. What should I do? Lee Erickson
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Rotted Link to NanoVNA-Saver on Wiki
I am trying to come up to speed with my NanoVNA and the NanoVNA Saver software on my own (not asking every single question on the forum). I have installed NanoVNA-Saver and connected to my instrument but need instructions. Regarding the wiki at: /g/nanovna-users/wikiThe link on getting started with NanoVNASaver goes to a message with a link that has rotted Getting Started (NanoVNA-saver Version 0.2.0) by Gunthard Kraus, DG8GB /g/nanovna-users/message/7663The rotted link: < At this moment this is my stumbling block to getting further with NanoNVA Saver. What should I do? Lee Erickson
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Genuine NanovnaH4 back in stock r&l electronics
#nanovna-h4
Just thought I'd let the group know that r&l electronics has the h4s back in stock for $59.95. f o b Hamilton Ohio so shipping will be fast. I have no interest other than being a satisfied customer of r&l.
--
Randy AB9GO
Milan Indiana USA
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hi, then I will help you with the solution: you download the ...- master.zip on github, unzip it and find a "fixture" folder in it where you can find the gerber files to make the pcb. You will usually need to send this in .zip packaging to the pcb manufacturer who manufactures it. By the way, Dan, KW4TI is the author who made it all. Its name is on the first page of the presentation. You can read about it in another group here: /g/radioartisan/topic/latest_version_of_the/53014887I wish you a successful making. 73, Gyula HA3HZ -- *** nothing is permanent only change ( ) ***
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Hi,
If you are viewing this message on your mail client a link at the bottom of the message will take to the io group page and then files and wiki menu will be on the left of your screen.
73,
Bill KU8H
bark less - wag more
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On 6/5/20 5:00 AM, Jon-G0MYW wrote: there's lots of real good information (+ manual) in the "Files" + "Wiki" section on the left of this screen....
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Re: Help Testing a Low Pass Filter
Hi GM7,
Yes I understand now surely after seeing your picture of the testfixture itself. I understand you found the problem in? the mean time.
The results not being perfect can be caused by component tolerances, stray -capacitances en -inductances, resistance of the inductors and in- and output of the filter not being terminated perfectly.
73
Jos
Op 4-6-2020 om 22:20 schreef GM7:
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Hi Jos,
Thanks for the reply. The photo doesn't show the setup very clearly. The LPF is a small board with male pins at either end. The fixture I built is a small board with female sockets to match the pins of the LPF. These sockets are connected to the SMA sockets on the board.
I also built two very small plugs to use for calibration. One with the pins shorted and one with a 50ohm resistor across the two pins. To calibrate I connect the fixture without the LPF to the NanoVNA using the two short SMA cables. I then follow the normal calibration routine before fitting the LPF.
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there's lots of real good information (+ manual) in the "Files" + "Wiki" section on the left of this screen....
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Re: Help Testing a Low Pass Filter
Another response plot with better display settings for the x-axis.
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Re: Help Testing a Low Pass Filter
Hi All,
I've attached the response curve of the 40m filter after being corrected. It's not perfect but it now looks like the response for a 40m LPF. The initial passband has some loss but that's presumably a function of component losses?
Roger, good spot on the logarithmic x axis scale.
Thanks again to everyone for their help. If anyone has anything more advice on LPF design or measurement it would be gratefully received.
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Re: Help Testing a Low Pass Filter
Hi avvidclif,
The test fixture and calibration 'tools' are homemade. You can see more detail in this picture.
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Re: white screen and flashing
Read more info on my site.
73, Gyula HA3HZ
--
*** nothing is permanent only change ( ) ***
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Re: Help Testing a Low Pass Filter
Might I ask where you got the test fixture?
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In the RARS presentation on using the NanoVna it references a test fixture supposedly available thru github. It's the one with the ZIF socket for testing components. Is anyone making those for sale or knows where to buy one, either complete or just the PCB??? My searching is not going well...
BTW that presentation is very nice, even I could understand it.
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Hugen,
The early FW version talks about connecting PA10 to PA12 but in your H4 schematic, it shows PA8 through R48 to PA12.? I assume R48 is not installed?
Also, what about the USB_V_IN on PA4? Do I need to sense that if using the F303?
Thanks
Larry
On Thu, 4 Jun 2020 at 8:34 PM, Hugen<hugen@...> wrote: Try this early test version, it can run on F303 without external crystal, there may be a lot of errors.
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Ignilux
Randy.AB9GO
Gyula Molnar
Jon-G0MYW
