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Re: Questions on Dislord v1.0.69 features
On 2022-05-03 06:45:-0700, you wrote:
This kind of gets to a point - there *are* people who know the answers on this list, but in general, they also have other things to do, so their time is limited. It's great that you're taking on the challenge of writing a book to explain it, but as you know, it's time consuming.This gets to the heart of the matter. there *are* people who know the answers on this list, but in general, they also have other things to doGood for them. So do I. It's great that you're taking on the challenge of writing a book to explain it, but as you know, it's time consuming.All I set out to do is write a user manual for the nVNAs (-H and -H4, though it generally applies to other nVNAs). I figure that if I write down each feature as I learn it, then that will benefit hundreds? thousands? of those to come. Oh, wait, there are already people who know all this, and could have taken 30 minutes to think about the device and jot down some useful things that they know. I have long history with software engineering. That means writing requirements, a design, then software and software testing. We don't seem to have much of this. I created the menu map in yEd because it is readily accessible, and anyone can update it from here out. So we have a Russian hacker who creates this stuff. I'm impressed with the talent. I don't speak Russian as well as he speaks English, and that is not very well. What I set out to do is write down what I think will help others new to the technology know what will happen when they press a button. That's why I posted that excerpt, to show what my intent was. I say was, because it didn't take long to exhaust resources. So, since I don't intend to spend hundreds of hours learning all this stuff, and there is not much feedback besides "look it up on the web", I figure /this/ part of the project is stalled. I've created lots of requirement docs in the past. Lots of design docs in the past. Lots of programming and software testing. So it's not that I don't get it...I do. it's also possible to be knowledgeable for writing the code, but not such a great explainer.This is a good point. But for me, it's a show-stopper. Because when I ask a question, and there is no answer, there is nothing to write down. I assume that no one actually understands what the answer is. I've put the user manual aside. Maybe all that I want to know is there in Russian, but that does me no good. I certainly don't fault a Russian for writing in Russian. I actually started learning Russian years ago, because I thought of them as major players in the science field. But then most of the people I worked with spoke pretty good English...not great, but we could have a conversation, and I could connect the dots. So I stopped learning Russian. Rats. Well, too late to start now... BTW, this discussion is not limited to this device. I spent 10 years working with PhDs who had the same lazy attitude. Too busy getting ahead of the next PhD to write down what they were doing. Before I left that group, they had hired //another// PhD to work in the lab ///// to reconstruct what had happened 10 years earlier /// because they were too lazy to write it down, and then had the misfortune to need it. I agree that we all get to choose how we spend our time. The scarcity of information is actually a time-saver for me. ~R~ 72/73 de Rich NE1EE The Dusty Key On the banks of the Piscataqua |
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Re: Questions on Dislord v1.0.69 features
On 2022-05-03 06:29:-0700, you wrote:
If you're writing a tutorial manual,I'm not. I'm writing a user manual for the nVNA. I think we could all benefit from tutorials of some sort, but we all have different interests. To me, that means that many people would prepare tutorials, each in their own area of interest or knowledge. When I first saw CABLE, I didn't know what would happen when I selected it. Now that I know, I can try to use it in different ways. ~R~ |
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Re: Questions on Dislord v1.0.69 features
On Wed, Dec 1, 2021 at 01:27 AM, DiSlord wrote:
CABLE - this cable measure util, need calibrate nanoVNA and connect cable1.2.5.3 CABLE S11 Choose a frequency range such that the cable length is ~1/4 of the wavelength in the middle of the range. This feature uses velocity of propagation. It automatically measures the length, characteristic impedance, and loss at the point of the active marker. Choose the range so that the Smith trace crosses near R=0 between ¡Àj. The shorter the cable, the higher the frequency range needed for analysis. Example: Assuming the signal must go out and back on a 10 m length of coax, multiply c * VoP and divide by 4X the coax length. (3e8 m/s * 0.67) / 40m ~= 5 MHz. A range of 5-15 MHz would cover this. This is what I am attempting to do with the user manual. There are many other ways to use this feature, but this addresses the basic requirements. Theoretically, any licensed ham will be able to adapt this description to other activities. -- ~R~ 72/73 de Rich NE1EE The Dusty Key On the banks of the Piscataqua |
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Re: Questions on Dislord v1.0.69 features
On Tue, Nov 30, 2021 at 04:15 PM, Larry Rothman wrote:
Would a simple google search help?The first suggests to me that each of these measurements needs its own threads, here or elsewhere. And that is for each used who wants to do those specific types of measurements. The second, however, needs some explanation here. A basic setup. What to look for, what the display will show. For example, if I measure coax, does it /need/ to be short or open? What are some restrictions? VoP must be set (usually)? Frequency concerns? (That last one is subject to mythology, as several noted writers have stated "magical" formulas that a) are magical because there is no basis explained, and b) not really correct, as my tests show.) What /doesn't/ need to appear here, at least for my view of a user manual, are all the different ways we can use MEASURE > CABLE, and all the conditions for them. But we could easily start putting together an /applications/ manual that has all that in it. My HP 15C is pretty basic compared to today's powerhouse calculators, but it came with a 300 page user manual and a 200 page advanced functions manual. Could I learn how to use that effectively? You bet. It is still a staple tool on my desk, on my tablet, on my desktop, and on my phone. I use it when I am flying, because it actually does weights and balances and wind correction angle calculations. To be fair, so does the E6BX app that I run on my tablet and phone. Not the point. I see so many questions about these nVNAs simply asking how to I use this? I started a user manual and am pretty much at a standstill, because I don't have access to experts who actually can answer my questions, but rather point to the web, and say do the research. -- ~R~ 72/73 de Rich NE1EE The Dusty Key On the banks of the Piscataqua |
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Re: Testing a monolitic band filter (3 pins)
Hello,
Making a model reproducing the 45MHZ pass filter of the ubitx (but with variables capacitors) and connecting at each end a toroid transformer I managed to improve the tracing of my filter. Or a slightly flatter shape at -2db and 16.15 khtz width at -3db with best adjust of capacitor If I want a perfect dish, is there a manipulation to do? I was wondering if the middle point must be absolutely connected to the ground, or if there is a possibility of connecting it to the ground via a small capacitor? your suggestions. cdt |
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Re: -H, -H4 meaning of R1 = 50 ohms
On 2022-04-30 04:20:-0700, you wrote:
I see only Rl = 50 (not 1 and not j)This is why I generally avoid the use of lower case "L" unless the meaning is clear, or I can use a font that makes s clear distinction. Simliar reasoning applies to the letter "O". In this case, I was hampered because I didn't know the context. I made this clear at the beginning. I don't intend to become a VNA expert. In saying this, I don't imply that anyone has any burden because of my point of view. It might be as simple as saying that I am not the person to document the features of the nVNAs. Finding an easy tool to use to make a menu map is one thing; documenting the nVNA, another. ~R~ |
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Re: -H, -H4 meaning of R1 = 50 ohms
On 2022-04-30 04:20:-0700, you wrote:
I see only Rl = 50 (not 1 and not j)Good point. I was not expecting a lower case letter here, so I interpreted that as a 1 on both the -H and the -H4. Even in email, I can't always tell, depending on how the font is shown. In this case, I copied the text into my text editor, and saw there that it is a lower case "L". As for the j, I made my first version of the new menu map by reading the one posted on the nanovna site, and it is not very clear. You will see that you can zoom into my menu and it will be very clear. I /guess/ that I interpreted that button as Rj, because even now it is not clear to me. Whoever manages is welcome to use the map from the files section here. When I look at my own map, that I created by reading the one on I see the Rj, so I assume that this is where I misread that. I will correct that today for both the -H and -H4 maps to use a lower case "L". You must read how made XTAL measures and another:Thanks for the link. I will read them. ~R~ 72/73 de Rich NE1EE The Dusty Key On the banks of the Piscataqua |
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Re: capacitor and inductor measurement accuracy
On Fri, Apr 29, 2022 at 11:02 AM, Rich NE1EE wrote:
I have ordered 2 RF demo boards, one from DeepElec and one from NWDZ --- maybeI just got a NWDZ board in the mail. Hope to take it for a spin this weekend. Here is a link to some testing done on a NWDZ version by a fellow in Germany... >>> Roger |
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SAVE button include range, please
I find that I often want to replace a saved cal, but don't recall which one. I then backtrack to Recall, and if I am busy, I write down which one I want to replace. Then off to the cal, and save. But if the Save button has the range as the Recall does, then it would be so much easier.
Comments? ~R~ |
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Re: -H, -H4 meaning of R1 = 50 ohms
On 2022-04-29 11:33:-0700, you wrote:
On Measure page Rl used for XTAL measureThanks for chipping in DiSlord. If someone here can explain how that is to be used, I'm happy to put it in the docs. My -H4 has Rj = 50 My -H has R1 = 50 I am guessing those are the same? We also have a Series XTAL S21. I have measured crystal filters, but only to see what it looks like. I really don't know much about them. So I'd appreciate hearing a difference between series xtal s21 and R1 or Rj = 50. A link is fine. I can read up on it. Thanks ~R~ |
Rich NE1EE
Gerard
Roger Need