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Both articles well done. Thanks. I have had some good success matching antenna impedance using the smith chart but using a chunk of coax for a shunt inductor eludes me. Could that possibly be the

I can envision the potential for lots of coupling due to either magnetic field or capacitive coupling at nasty power line harmonics which can extend out quite far in frequency.

Many thanks to everyone for replies. Im still playing about with the device, and very impressed. Just wish i could could Mr J Smiths software to work, although i believe hes stopped development and

Are you certain that you are actually downloading to the NanoVNA, and not possibly uploading the old from it, and overwriting your image? If you errantly did that even once, subsequent correct

Hello, I have a nanovna H4 I downloaded the firmware and installing it with the Dfuse program, all very well, but the firmware in the H4 not change, it remains the same, any suggestion? Thank you

The WTCP irons are not cheap irons. I have three of them at work. I can verify that the tips are grounded. I have a cheapie Weller 25 watt iron that I added a solder lug and a wire with an alligator

Eric, You need the Device manager to show that you have a DFU device installed. Using the Device Manager (DM), and with the nano connected, delete any STM bootloader device(s) shown. Then, use Zadig

Let me know how you go, I am also interested to do that.

This thread may be helpful: /g/nanovna-users/topic/80361897#20422 Reinier

Working on 900 MHz patch antennas (copper foil for tuning and matching) with about 1 or 2 meter of coax to the (original) SAA-V2, I had 3 broken units (1 from my customer). All revived by replacing

Yes, and I have seem the ground pin cut off, and I have seen miss wired wall sockets. Just letting people know that simple/cheap soldering Irons can kill digital electronics.? Kent

I would also think that even if a tip did have capacitive coupling, unless the board had earth ground somewhere, that no current would flow . . . .kinda like a bird on a power lime.

The typical Weller WTCP irons all have grounded tips.

If you measure capacitance between the AC cord to the Iron tip, you get about 200 pf. The AC voltage is capacitively coupled to the Iron tip unless you have a specially grounded IRON,(And have the

maybe a spike killed the first switching chip (those are well known to burn up) dg9bfc sigi Am 02.10.2022 um 17:24 schrieb linhz0hz@...:

dont shoot on me if you break it ... grin dg9bfc sigi Am 02.10.2022 um 19:17 schrieb Danny K5CG:

I am interested if anyone figured this out, because I just fried mine nanoVNA SAA-2N just now. -_-! I was building some homebrew amplifier. Before measuring that, I wanted to calibrate the test PCB

Now look what you've done Siegfried. Now I'm going to have to try that.

Hi, in using a nanovna H4 , WIN 10 64bit , 16G ram I could not get the program to run at all, ive downloaded the 32bit version and it runs fine, however takes a good many secs to load up.

If you dont mind using CMD Line Interface, try dfu-util to install firmware. See https://docs.particle.io/archives/installing-dfu-util/ to install. Real easy to use once you have .dfu file downloaded