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Re: New FreeRTOS-based nanoVNA 4.3" 800x480 LCD on Aliexpress
They are claiming 60 dB dynamic range over the full frequency range. Below is quote from site. "Designing a metal shield for the RF front end, allowing the S21 to have a dynamic range better than 60dB
By George · #1858 ·
Re: TDR function vs code space
I've not had time to start working on the code yet. Ultimately I'm more interested in switching to the STM32F303CCT6 with 3x RAM and 2x flash. However, I plan to look into configuring the
By Reginald Beardsley · #1857 ·
Re: New FreeRTOS-based nanoVNA 4.3" 800x480 LCD on Aliexpress
Very interesting. I din note that the display had a ribbon cable connector. That is handy in case you damaged your display. I also liked the fact that controls were on the other end of the VNA.
By JIM Rogers · #1856 ·
Re: Early app for the NanoVNA
Hi Rune, Python version here is 3.7.4 (same as yours if I remember correctly). I recently installed the extra modules for Python 3 for another app, because I too had a default of Python 2, so I knew
By Andy G0FTD 3rd Earl of Whitstable MBE BBC ITV etc etc etc etc etc <punkbiscuit@...> · #1855 ·
Re: Early app for the NanoVNA
Hi Jeff, thanks for the further suggestions - the list is getting long :D Wrt. the import of this particular file, I currently *only* have importing of S-parameters in real-imaginary form normalized
By Rune Broberg · #1854 ·
Re: Early app for the NanoVNA
Hi Andy, the only thing I can think of is possibly having them installed using pip for python 2? Maybe check whether they have been installed with "pip3"? Try looking at pip --version and pip3
By Rune Broberg · #1853 ·
Re: Early app for the NanoVNA
Hi Rune, Here's the error messages $ python3.7 nanovna-saver.py Traceback (most recent call last): File "nanovna-saver.py", line 19, in <module> from PyQt5 import QtWidgets ModuleNotFoundError: No
By Andy G0FTD 3rd Earl of Whitstable MBE BBC ITV etc etc etc etc etc <punkbiscuit@...> · #1852 ·
Re: Early app for the NanoVNA
Thanks, Rune. I didn't realize there was an alpha setting in the color-selection window. Good to know! Playing some more with the 0.0.5 release (and really enjoying it), here are some more comments...
By Jeff Anderson · #1851 ·
Re: Don't rotate the SMA centre pin! But how do I avoid that?
Bnc stds valid above 600Mhz are nontrivial, and not so cheap. Well. Not sure that fixes anything. Might be wrong about that. Or to a female-male barrel.
By Hans J Albertsson · #1850 ·
Re: Don't rotate the SMA centre pin! But how do I avoid that?
In reality, how much damage is being done? Is all the hassle trying to avoid rotating the pin really worth it when you consider how easy it would be to replace the SMA ports on the VNA? / Gerry
By Gerry Kavanagh · #1849 ·
Re: Don't rotate the SMA centre pin! But how do I avoid that?
1) Use BNC or N instead of SMA. 2) Fabricate your own (female) short to use with (male) pigtails. 3) Keep (male) 50 Ohm SMA connected to female-female barrel for use with (male) pigtails.
By Oristo · #1848 ·
New FreeRTOS-based nanoVNA 4.3" 800x480 LCD on Aliexpress
Interesting development folks - while browsing the Russian NanoVNA forum, I found a reference to this link: https://www.aliexpress.com/item/4000145797356.html <<< lots of photos there. Features:
By Larry Rothman · #1847 ·
Re: Early app for the NanoVNA
Hi Andy, could you tell me what error message you are seeing? What command did you run to try and start the software? Since you mention Linux, I assume you are using a git checkout of the source. The
By Rune Broberg · #1846 ·
Re: Don't rotate the SMA centre pin! But how do I avoid that?
I hereby solicit further answers to this question, i e other people's takes on this issue. I did glean, from a joeqsmith video, that ideally one might leave two male-female cables permanently attached
By Hans J Albertsson · #1845 ·
Re: Early app for the NanoVNA
Just for info, I am having difficulty getting the Python software to run the app. Same errors as other posters have mentioned. Upgrade Python on my Linux Mint and I appear to have all the correct
By Andy G0FTD 3rd Earl of Whitstable MBE BBC ITV etc etc etc etc etc <punkbiscuit@...> · #1844 ·
Re: Adding battery to Banggood version
Karl, Have a look at a few of my earlier photos I uploaded. I used a thin 1100mAH battery from an old cellphone. The charging chip used on the Nano will charge almost any small LiIon battery. Do a
By Larry Rothman · #1843 ·
Re: Adding battery to Banggood version
FWIW, given the overall construction quality, I'm going to repackage mine when I have some time. I intend putting a much larger battery in - perhaps something that will last 24 hours, so I just have
By Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...> · #1842 ·
Adding battery to Banggood version
What is the max. physical size the battery can be to add to the Banggood model? Unlike a lot of other models, this one came without a battery, and I am looking for some advice as to what to buy. Do I
By Karl Heinz Kremer · #1841 ·
Re: How to measure source impedance?
Output impedance can be calculated (estimated, at least) from the (complex) incremental change in output voltage and current after a small change in load impedance. No need to run anything open
By Hans J Albertsson · #1840 ·
Re: How to measure source impedance?
you initially waved around a complaint which might as well be a surrealist's dream: your HT will be un-burnt when you fill your bathtub with brightly colored screwdrivers. and now you make rude
By kb3cs · #1839 ·