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[email protected]> wrote: If, after calibration, there were perfect opens and shorts* at the reference plane*, there would be dots. But the standards apply opens and shorts some distance from the

We should clarify something here regarding very short (as a function of free space wavelength) radiators. A short radiator (a short monopole or small open ended 'wires' of a transmission line)

Thank you Wofgang and Dave for pointing out the obvious I have two Bird type meters and slugs that have been considered to be the standard in commercial radio service for decades. They are rated at

Every video on the topic or all of them? What is wrong with it? As I see it he is just trying to make his homemade set behave similar to the HP one. Could you point to a better article/video about the

Jim's response is making some sense, I think. Ideal transmission lines and antenna wires, and ideal caps and inductors in a matching network, they should all be lossless. The primary issue with very

Links within the FAQ now work. thanks! I could understand the results shown in that FAQ if the VNA is calibrated using one set of O-S-L standards and the VNA is then used to measure the open and short

David, Having O-S-L correction factors only available in host software like nanovna-saver seems a fine solution. Though there are larger ARM processors that should have no trouble doing this sort of

For now I'm just hoping it will be close enough to at least somewhat improve the results. I wouldn't use them for a data-based calibration either, the idea is to maybe just fit delay and a single

Dr David Kirkby Ph.D C.Eng MIET Email: drkirkby@... Web: https://www.kirkbymicrowave.co.uk/ Kirkby Microwave Ltd (Tel 01621-680100 / +44 1621-680100) Stokes Hall Lodge, Burnham Rd,

Ah, I see. I was thinking about mentioning swap-equal adapters, but didn't because they are mostly obsolete and expensive. They are not exclusive to APC7 though. The nicer 3.5mm calkits e.g. tend to

Despite that discussion is now starting to get carried away from any relevance to NanoVNA (which will make this my very last post on that thread).... Apart from the skin effect - *any* load does have

Thanks Dave, that was exactly my point. We should take it as the wonderful and cheap tool, that opens up world of VNAs that many of us would never have been able to see otherwise. I don't think for

No, the APC7 coax cables are not necessarily connected to an APC7 equiped DUT. Typically, adapters (e.g. APC7-to-3.5) are connected to the cable ends to match the DUT's connectors, which can be N, SMA

There’s too much variation from one to the other. You really need the Touchstone files of the parts you have, which pushes up production costs significantly. > However, I expect it will be much

[email protected]> wrote: That particular short is very repeatable, as the female centre conductor has no slots in it, so it doesn’t expand in diameter when the male pin enters. If a low-cost kit

wrote: the same author. *Every* video I have seen from him are wrong, although this is is not as bad as others. It’s not that important that the phase of the open and short are exactly 180 degrees

99:70 gets pretty close, but I wouldn't want to wind it. 73, Gordon KF5JWL

Did not read the whole message , sorry, But I can tell you that as a hammer it has really poor quality.. One have to ask himself if the job is good for the tool to!

For flush open etc you might find this interesting: https://www.youtube.com/watch?v=-PK9Bn7Ixnw Concerning zero-delay/flush shorts, I think this is not really the issue.

The simple graphics didn't work out. Here's a web page on various matching schemes, including the min-loss-pad you describe plus some narrow band designs: http://ham-radio.com/k6sti/match.htm Jerry,