Re: Any ideas for test jigs?
I have been using a fixed L and a fixed C on 3.5 and 10 MHz. Works very
well in getting a quick check of calibration.
Mel, K6KBE
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On Thu, Oct 17, 2019 at 7:17 AM Oristo <ormpoa@...> wrote: Perhaps a 500 ohms reactance would work in measuring. Perhaps calibrating nanoVNA THRU using an RF Active Probe, e.g.
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Re: errors of "error" models
#52 : Update : The compact SLO formula for [AnyVNA] - after /g/nanovna-users/message/5081 - 17 October 2019 /g/nanovna-users/message/5075 - 17 October 2019 by Gary O'Neil - @Gary O'Neil: Dear Gary, Thank you very much for your most valuable comments ! Allow us, please, to ask you to give us enough time to prepare our replies. Meanwhile, take into account, please, that you already motivated us to attempt to write a minimal set of statements, valid more-or-less in ANY computer language having NO internal type of COMPLEX variables and only a REAL one, regarding : #42 : The compact SLO formula for [AnyVNA] - 12 October 2019 /g/nanovna-users/message/4747in order to be ready for embedding them in ANY related program by the interested reader of- and/or contributor to- this thread of messages. However, during the transferring of that formula to statements, and after we found and corrected an existing typo in it, we finally succeeded a further compactification of it, and thus we updated it, as follows: that is in a super-mini form most appropriate for this particular work : Thank you - Please, stay tuned Best regards, gin&pez@arg 52#
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Re: Any ideas for test jigs?
Perhaps a 500 ohms reactance would work in measuring. Perhaps calibrating nanoVNA THRU using an RF Active Probe, e.g.
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Re: NanoVNA WebApp USB question
Hugen,
If I order a NanoVNA-H today will it have the 5.1k Type-C CC resistors installed?
What is the link to your Nan0VNA-H site?
If someone does not have a NanoVNA with the resistors does this workaround when connecting to a USB Type-C port:
USB Type-C to USB Type-A Male cable (supplied with NanoVNA) to Type-A Female USB Type-C cable
Mike N2MS
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On October 16, 2019 at 9:41 PM hugen@... mailto:hugen@... wrote:
The newly released NanoVNA-H has added the 5.1K Type-C CC resistors, which is already installed if it have a "NanoVNA-H V3.3" tag on your PCB.
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Re: Owen Duffy on improvised test fixtures
#test-jig
Hi
Perhaps the caption should have been "nanovna-saver ¨C a premature look".
I mean it is of version 0.1.0. I took a different approach than writing a blog entry, or webpage, about it, namely to engage in the evaluation, and report my findings and suggestions to Rune. So from a kind of "aaaahhhh, no thanks" to "OK, interesting - let's see what this can become."
Indeed I had my head scratching moments too. The very first one was the NanoVNA and -Saver and the indiscriminate use of CH#, Port# and S## (My NanoVNA measures S00, and S10 instead of S11 and S21 etc.). I did a lot of wrong calibrations. Yes, the return loss, S11 (S00), reflection coefficient are not three different names for the same thing. But I am sure we will get there.
With the very best of intentions
Bo
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Wow - you have a lot of time to look up all of these posts!Are you going to put all this in the application notes section of the wiki? On Thursday, October 17, 2019, 9:40:12 a.m. GMT-4, Oristo <ormpoa@...> wrote: > I have one of the $9.00 eBay bridges, and a noise source. With a SDR as a detector I can do some Nano to Bridge comparisions, I hope. Enhancing nanoVNA by an eBay 3GHz RF bridge is interesting. Before getting nanoVNA, I considered using SDR and noise source with eBay clone Warren Allgyer seemingly reported comparable results /g/nanovna-users/message/2484using 3GHz bridge with nanoVNA vs nanoVNA alone, which resistive bridge was analyzed by alan victor /g/nanovna-users/message/1252QRP RX described using nanoVNA to measure 3GHz bridge directivity /g/nanovna-users/message/2880Erik, PD0EK uses 3GHz bridge in his 35MHz - 3GHz breadboard VNA /g/nanovna-users/message/2054/g/nanovna-users/message/3422
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Hi Rune , very happy for the new improvement on the 0.1.3 of nanovna-saver.
Suggestions for the future version :
1 Save the settings of nanovna , start stop center number segments , sweep mode , when saving the calibration ,not necessary as separate file , better in the same file. Recalling calibration file , the parameters will be update automatically.
2 Have a marker over the graphic for the main parameter , as a choice instead to display all data.
Many thanks again for your effort to improve the SW that is making the nanovna a very powerfull piece of hardware.
Best regards
Maurizio IZ1MDJ
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Re: Abbreviated documentation for more simplistic tasks?
That said, there are number of useful tutorials on YouTube. Listing them
would also help new users. Citing in messages helpful specific URLs applicable to nanoVNA (and why) has value.
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On Wed, Oct 16, 2019 at 09:22 PM, Martin wrote:
I've got some other info that may be of help, but I can't find the document at
the moment.
Hi Rune, I still can't find my old paper notes on the subject of Cs, Cp, Ls and Lp but this Keysight document seems to be the closest to what I was looking for. Section 1 of this document Section A1-5 of the following is also useful and Table A1-3 in this document define the various formulae Regards, Martin - G8JNJ
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Re: Owen Duffy on improvised test fixtures
#test-jig
On Thu, Oct 17, 2019 at 12:54 PM, Bilbo wrote:
why would anyone care what Mr. Duffy has to say?
Because in my experience he is usually correct in what he says, and his blog postings lead to greater understanding of various subjects, mainly due to him challenging what others may take for granted, or worse still, may be inadvertently propagating as false information. There is a lot of misinformation on the internet, and there are very few who seem to be bothered to try and correct it when uncovered. Owen is one I'd always listen to, even if personally challenged by what he has said or written. It's happened to me, I've learnt a lot in the process, and continue to respect him. Regards, Martin - G8JNJ
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Re: NanoVNA WebApp USB question
"NanoVNA-H V3.3" tag A dedicated USB attachment, stripped of display, battery, and switches would be nicely light weight and efficient
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Re: Owen Duffy on improvised test fixtures
#test-jig
The question is, why would anyone care what Mr. Duffy has to say?
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Re: Any ideas for test jigs?
Yes I thought that something like that would happen. If I put a tuned circuit on the collector/drain and match it to 50 ohms, it will not tell the true Hfe. Perhaps a 500 ohms reactance would work in measuring.
LM
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Owen Duffy on improvised test fixtures
#test-jig
While Mr. Duffy was rather unkind to both the NanoVNA and Mr. Broberg, he does have an interesting blog. Here he talks about improvised test jigs
Jim, KA6TPR
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Re: NanoVNA WebApp USB question
Some people said that you can solder anything you see, so get a magnifying glass. I dont beliewe that is always true but maybe you can. Leave coffee out for a while and try. I can just use 0603 with my nose almost touching the PCB.
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Re: NanoVNA V2 - I vote for a larger instrument...
From: necessaryevil86@...
What I want is a slightly larger display, a 3.2" or a 3.5" is not that much more expensive...
But I also know: the most dangerous thing in the world beside a programmer with an soldering iron is a user with an idea...
=========================================
There's the NanoVNA-F:
Works with Rune's NanoVNA-saver software too.
Cheers,
David
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv
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Hi Rune,
I have a suggestion. If one tries to adjust a homebrew filter of any kind it would be very helpful to see the result of the adjustment at least for S21 and S11 simultaneously on one plot. In other words, could you please make a flexible window where one could select various data to be displayed on that window simultaneously?
Kind regards
Norbert, DG1KPN
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Hi Gary,
I am aware of the scaling issues. It occurs primarily (only?) when values
grow "quite large" or "quite small", and thus can't fit in the assigned
fields. I haven't made the fields fixed size, in order to allow for example
very large values, but that does mean they can sometimes end up scaling. I
am looking to make functions that make sure the values get scaled
reasonably, for example using k/M/m/¦Ì unit prefixes.
Thanks for the feedback! :-)
--
Rune / 5Q5R
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On Thu, 17 Oct 2019 at 00:50, Gary O'Neil <n3go@...> wrote: I'm observing that the Text window (left side of the display) resizes
horizontally when marker data updates. This causes the displayed charts to
resize as needed to fit the screen, and it creates a rather annoying video
jitter in continuous sweep mode.
If I turn off all markers it appears mostly stable, and also if I stop the
continuous sweep.
With markers off and a Smith chart displayed a similar condition
reappears, but this time it seems to resize everything vertically, and a
horizontal scroll bar appears and disappears at the bottom of the display.
I'm running this on a Windows 10 desktop, with edy555's version 0.2.3
firmware loaded on my NanoVNA. My display is set to the Windows 10
installation default of 1920 x 1080 (Recommended).
Changes to screen resolution or whether displayed full screen or as a
window doesn't seem to alter this behavior.
Is anybody else seeing this behavior?
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73
Gary, N3GO
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Hi
I see the resizing too. Reported to Rune. The problem, as I see it, is that the panes with the marker numbers are auto sized/not fixed in size.
Bo
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gin&pez@arg
Oristo
Bo, OZ2M
Starsekr
David J Taylor