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Hi, The scale is neither linear nor logarithmic, and I’m not sure what it is. Luckily it does not matter if you just want to use the smith chart. Generally for radio work the centre is defined as 50

Not a math wiz here but one of the best ways I learned about the chart back in college was to see the mathematical calculations (and thus derivations) for the actual circles. The smith chart has

An off - topic question to any math wiz knowledgeable about Smith chart. There are oodles of stuff about Smith chart, but I have not be able to find WHAT is the actual scale of the coordinates. For

Thanks a ton guys! have some 50ohm for dummy loads I planned to build, will use and report.

Hi Larry, Thanks. I have one from the first batch, I am used to upgrade. And it's so easy to go into dfuse mode...

Newer FW versions add functionality and/or correct errors. Any FW version from the beginning of 2020 will do and they are easy to flash into the device.

Thanks, but sorry I did not get if you answered my question: best fw for nanovna-saver Cheers and thanks

Thank you it seems I am too late... Chris --- 'Everything should be made as simple as possible, but not simpler.' -- Albert Einstein Am 24.03.2020 um 11:23 schrieb CT2FZI:

On Tindie you can pay with Paypal. In my account I can use it for paying... Chris --- 'Everything should be made as simple as possible, but not simpler.' -- Albert Einstein Am 05.03.2020 um 21:27

The nanovna saver is not currently being developed because of the busy programmer. Latest Version: 0.2.2.1 (Python 0.2.2) https://github.com/mihtjel/nanovna-saver/releases/tag/v0.2.2 The 2.8-inch core

Hi everyone, From all the firmware versions for the nanovna-H (original) what firmware do you recomend to take the most from the nanovna-saver? Or, is the nanovna-saver agnostic to fw version? Cheers

Howdy Pablo! This virus should has thrown the world into turmoil... I hope it turns out to be a minor virus, not as bad as the flu. As far as coax for antenna for an H/T, I would assume around 145 MHz

Hi Roger, Thanks for this, your results look very similar to mine, there is a slight difference in the frequency of the dips but I assume this is due to differences in the mix of the core material,

Tindie out of stock - I have purchased their last unit :)

Kerr, I wound two 1T to 8T impedance transformers using BN73-202 binocular cores and insulated, solid, silver-plated wire-wrap wire. They were connected back to back and the 1T sides soldered to SMA

Pablo you can also take a look at this video that is very detailed on how to determine the impedance and velocity factor of any unknow coax cable: https://www.youtube.com/watch?v=TpIIftvQPFM

Saludos Pablo, You could use the TDR function of the NanoVNA to check the impedance of an unknown coax cable by soldering a non-inductive variable resistor (value within the range of the suspected

Had exactly the same DANG here. Totally loose display and connector broken. I was able to resolder the display onto the pcb. Took me 5 times of trying but I succeeded :-) Give it a try. 73, Arie Pa3a

50 or 75Ω, it shouldn't make a big difference unless you are wanting to push high power through it.

Try these: /g/nanovna-users/topic/69269493 https://www.rudiswiki.de/wiki9/nanoVNA#Coax_Cable_Impedance