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S parameters get used in matrix calculations on arbitrarily complex networks, they have to be mathematically correct. The "Return Loss" in dB, on the other hand, strikes me as a handy way to casually

The book is available (legally) on the web as a pdf: http://www.w3pga.org/Antenna%20Books/Reflections%20III.pdf Maxwell had an amazing career, and knew this stuff cold. Lots of good insights in that

Clarifying it seems unlikely to appreciably mitigate Wiki confusion...

Thanks.

https://store.cq-amateur-radio.com/shop/reflections-iii/

Which Maxwell? What book? DaveD

This reminds me of this old discussion about how to represent the reflection coefficient. The stuff included below is from post /g/nanovna-users/topic/34589622#5275 All but the final

I cheated and used 1/4" (5.6mm) plywood as its easy to cut and finish plus wooden legs. Allison ----------------- No direct email, it goes to bit bucket due address harvesting in groups.IO

Thank you for the article Roger. So many people doing it incorrectly is no excuse to remain ignorant. We can start here and now, since it is pertinent to this purpose of this group. Danny K5CG

It is incorrect but so many people do it even in engineering literature. The editor of IEEE transactions got concerned about it and wrote this article... Roger

And generally they're both plotted with "smaller reflection coefficient magnitude lower than higher" - So the plot goes from, say, -40 to 0 (or 40 to 0)

You will see Return Loss presented both ways, depending on the author. Retaining the negative sign is less often seen and perhaps *wrong*, but either way the intent is obvious. Jerry, KE7ER

Larry, I assume the user guide you wanted me to look at is this one: /g/nanovna-users/files/NanoVNA-User-Guide-English-reformat-Jan-15-20.pdf I tried using an earlier version of that

The presentation is very good. However, slide 12 is not correct in the suggestion that Return Loss is always a negative number. That is simply not the case. The reflection magnitude in db is always a

Well, I think you made a great choice! I started out with a fairly early NanoVNA in October, 2019 and liked it, but had a hard time reading it outdoors, and sometimes indoors. I got a -F this June and

As you say, most cutting boards are PE, but it is also a significant ESD hazard - Unless you buy a piece of dissipative plastic (McMaster Carr) most plastics are a hazard. You could coat it with a

Before you scrap your wonderful stand there Dallas check to see if it is an ESD hazard. Most of the food prep boards I have used for construction (yes, they are an excellent and cheap source of

Hi Hugen, how is status of V2 with 4 inches! may I ask 617DB-1023 or YB006T-1023 is used in yours? Do your product support same firmware+software from S-A-A-2, mean direct updates? bcos I am

The wiki page User Guides ( /g/nanovna-users/wiki/12475/114877 ) has been updated by Oristo. *Reason:* move videos to External Links page Compare Revisions (

Dallas 3:48am #16466 Good point on ESD. Thin metal, plywood, paneling, or Masonite might be a better material choice. I will make up a new one. Thanks, Dallas, N5fee