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Generally, look for where the most pronounced ‘dip’ is relative to the frequency you’re tuning for. It should be close to what you’re looking for. If the lowest SWR is at a lower frequency

You'll not be rewinding that transformer. The assembly is 6 mm (1/4") on a side, and it is "not user serviceable", in that the winding is probably bonded to the core, the core is bonded into the tiny

I added a python program to my toolbox that retrieves the S-parameter from NanoVNA-H and stores them either as S-parameter or Z-parameter in touchstone RI (real/imag) format. It would be easy to

Using formula 234/freq for a 1/4 wave vertical with 4 radials I was building gave me a wire length of 16 feet 6 and 1/8 inches. Nano vna gave swr of 2.3 (too high for my qrp station) so tried to find

`That's what I thought. Looked for a file, but no luck so far.

The NanoVNA doesn't have very good visibility into its internal state, i.e. the sweep range and other parameters. The software can send a sweep command to get the current sweep setup sweep – sets

If you have to rewind a transformer then you could just buy a core and completely build it... Why not just buy a different one that directly fits your needs?!? 73 sigi dg9bfc Am 25.07.2022 12:01

Using nvna-s 0.3.9. Why does nvna-s default to a sweep range of 1M to 100M when I connect to the device? I have set the cal range to 100k to 50.1M on the device itself. Where is the nvna-s default

I see the link is in his message.

Ed, Thanks for that link! Do you have a link to the entire work? Chuck Bland

Fran?ois, Greek letters are everywhere, in Physics, Maths, Medicine &c. &c. In English there is a fairly uniform pronunciation

Mini-circuits T1-1T-X65 https://www.ebay.co.uk/itm/402773717736?hash=item5dc72f32e8:g:UJAAAOSw1QRgZbWB Might be a fake, so might other items on ebay! Kind regards Ed, G8FAX

Hi Francois, It seems you want in EXCEL to separate out the real and imaginary parts of a COMPLEX number. You could use the functions IMREAL and IMAGINARY to do this. and then make use of the other

I was only able to find on the UK ebay the COILCRAFT TTWB1015 0,07MHz-225MHz Wideband RF Transformer 1 : 1.5 (

My "formula" are used to perform calculations in Excel; for example, to calculate 'L' adapters. The algebraic form is easier to copy, especially when you have to pay attention to cells with $. The

Hi Francois, Your development to conclusion appears correct. To be sure use some test values to check it. You might find an alternative approach less mathematically demanding: Addition and subtraction

Hello ** I agree gamma=S11 ** In effect If we use Z = Zo * (1+gamma) / (1-gamma) that means: Zo + Zo.gamma = Z - Z.gamma gamma.(Zo+Z) = Z - Zo gamma = (Z-Zo)/(Z+Zo) But the question was how to

Re comment: “But S11 is not the equivalent of gama.“ Indeed Gamma (a vector) is calculated by the quotient of (Zload-Zo)/(Zload+Zo) with Zload and Zo both complex numbers. The result Gamma of this

For Z2S and S2Z for S11 and S21 I made this one up. It might help a bit. https://pa3a.nl/wp-content/uploads/2022/07/Math-for-nanoVNA-S2Z-and-Z2S-Jul-2021.pdf 73 Arie

Two years ago I have built the enclosed spreadsheet in ODS format (Libre Office) for education purpose. Maybe it can helpful, and also be easily modified or adapted. Blue fields are input ones. The