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Re: First PCB pictures of the V2
I'd also like to suggest being able to rotate the screen so that the SMA's and cables are not facing the user.
However having removed the jog wheel and converted my Nano to use small push buttons (see attached) with a positive tactile 'click', I definitely wouldn't recommend fitting a jog wheel in any way, shape or form. Regards, Martin - G8JNJ |
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Re: errors of "error" models
@Gary O'Neil, N3GO : 20 December 2019
/g/nanovna-users/message/8429 Dear Gary, Thank you, very much indeed, because you noticed this ! Well, in our sow this means : "keep the signal flow diagrams, use them to correctly express the relations between a-s and b-s at joining ports, and forget the -most disorientating- "rules" of them". And we used it in this way for more than 25 years until last January 2019, when we found -with much pleasure, indeed- its full independent justification at: D. M. Kerns and R. W. Beatty, "Basic Theory of Wave guide Junctions and Introductory Microwave Network Analysis" [*], Part 2, Introductory Microwave Network Analysis, 2.18 Signal Flow Graph Applied to the Scattering Equations pp.123-124, International Series of Monographs in Electromagnetic Waves, Editors: A. L. Cullen, V. A. Fock J. R. Wait, Volume 13, Pergamon Press Inc, First Edition, 1967: "(f) Comments on use of signal ?ow graphs This technique offers nothing fundamentally new and, if correctly applied, yields the same results one would obtain by solutions of the scattering equations. It seems to be simpler in some eases to write down the solutions by inspection of diagrams rather than by algebraic manipulations. However, one must he careful not to miss any of the loops, and this is a possible source of difficulty, especially when we are dealing with 3-ports, 4-ports, or more complicated networks. As a graphical aid to intuitive thinking about the analysis of systems, it is no doubt valuable, and is therefore a tool to supplement conventional algebraic analysis." Best regards, gin&pez@arg [*] 16 November 2019 : /g/nanovna-users/message/7092 |
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Re: errors of "error" models
#87: The 5 Main Points in the First Introduction of an Automatic VNA System
- REF : #85: On the Formation of a Virtual Port - 15 December 2019 : /g/nanovna-users/message/8237 In "An Automatic Network Analyzer System", Microwave Journal, May 1968, p.46 the 5 main points have as follows: but the scaring "nontouching loop rule" mentioned in number 4 is redundant. gin&pez@arg :87# |
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Re: errors of "error" models
@Gary O'Neil, N3GO : 19 December 2019 :
/g/nanovna-users/message/8399 Dear Gary, [pdf]=>[pdf-xchange-2.5.322.10]:[export-to-image]:[png][300x300-true-color-24 bpp]:[8-pages]=>[cdware][*]:[psp5.0.3]:[sharpen-more][resize:50%][grey-scale] [decrease:16][optimized-nearest][brightness/contrast:0/18]=>[8-images]=>[pdf- -shaper-9.6]:[image-to-pdf][fit-to-page(keep...)]=>[pdf:of-reduced-size]=>[pdf- xchange-2.5.322.10]:[ocr][preserve][medium]=>[pdf:of-reduced-size-with-search] [*] cdware : A Classification of Ware Types : - done - sent - Best regards, gin&pez@arg |
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Re: Strange readings on my modded vna.
On Thu, 19 Dec 2019 at 09:11, <nanovnauser@...> wrote:
no ideas on this then folks? It¡¯s impossible to work out what you have done from your description, so I have no idea. Dave. -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@... Telephone 01621-680100./ +44 1621 680100 Registered in England & Wales, company number 08914892. Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom |
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Re: problems
Hi Nanovnauser
USB socket ??. The delay is part of the onscreen menu by selection "Display" then "Scale" then "Electrical Delay" Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] <[email protected]> P? vegne af nanovnauser@... Sendt: 19. december 2019 21:25 Til: [email protected] Emne: Re: [nanovna-users] problems just wondering how you charge it without the usb socket? |
gin&pez@arg
OwO
Dr. David Kirkby, Kirkby Microwave Ltd
Kurt Poulsen