Re: Can't update firmware
Thanks, Oristo. That fixed it. The key thing that finally made it work was when I Uninstalled the old driver before starting up Driver Wizard. Otherwise it just kept telling me I already had the best driver for my device.
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Re: Any ideas for test jigs?
Signal levels may be a problem. Where it is best to put an attenuator.
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Re: errors of "error" models
#51: the full final report 1 with contiguous full online images is here:
51#
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Re: Any ideas for test jigs?
Indeed ...Just thought I'd inject (from nanoVNA) CH0 into base (via bias-t and attenuator) monitorCH1 out on collector (via bias-t) and look at screen ...close enough for me
Jim
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On Wednesday, October 16, 2019, 11:57:17 AM PDT, alan victor <avictor73@...> wrote:
Getting Ft from measured S data is pretty straight forward. The key is you DO NOT NEED TO MEASURE TO THE POINT OF UNITY CURRENT GAIN!
Simply take a couple of points say at 10 MHz and 100 MHz. You will need the full 2 port S data at 10 and 100 MHz. Then convert that data to H parameters and fetch the h21 parameter. Check to be sure that the roll off rate between 10 and 100 MHz is 20 dB. It should be, if not you have a fundamental problem from the get go.
Then simply extrapolate the roll off until the h21 parameter goes to unity. Viola' the ft value.
If you need clarification on this stuff, let me know.
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Re: errors of "error" models
#50 : The Full Final Report 1 : - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Nominal Values Zinp = ( Rinp , Xinp ) of our Standard [ref2007box], in terms of frequency, using [NanoVNA] and [VNA] - - - - - - - - - - - - - - - - - - - - - - - - - - - - - [NanoVNA] ~ [VNA] Comparison #30 : our final report 1 - 6 October 2019 : /g/nanovna-users/message/4179- also @Gary O'Neil - 8 October 2019 - /g/nanovna-users/message/4385Hello, Allow us, please, to present the steps by which we got the results of our final report 1. - - - - - - (c) gin&pez@arg (cc-by-4.0) 2019 : start - - - - - - First of all, in order to set up a Somehow Reliable Comparison between our [NanoVNA] and our [VNA], we decided to put aside the sma/M SLO "Standards" and use our TypeN/M 50 Ohm SLO 'Standards', as well as our Standard [ref2007box], to both our [NanoVNA] and [VNA]. So, to get the Same Reference Plane for both instruments, we used our [sma/M-to-typeN/F 50 Ohm] adapter directly connected to [CH0] port of [NanoVNA]. After that, since we already had our [VNA] results under these very same SLO+[ref2007box] conditions, we used only Putty to collect the measurements from [NanoVNA] and proceed step-by-step to the following graphics: I/III The four 4 measurements : ( s, l, o, gamma ) needed for our expression of Gamma: #42 : The compact SLO formula for [AnyVNA]: /g/nanovna-users/message/474712 October 2019 by using our [NanoVNA] : RED points in the following Figures, as well as by our [VNA] : BLUE points in the same Figures : I.1/4 : SHORT CIRCUIT Measurements : s Magnitude : Argument : I.2/4 : (MATCHING) LOAD Measurements : l Magnitude : Argument : I.3/4 : OPEN CIRCUIT Measurements : o Magnitude: Argument : I.4/4 : Our Standard [ref2007box] : gamma Magnitude: Argument : II/III The Nominal Value Gamma of Our Standard [ref2007box]: By substitution of the above measurements - from I.1/4 to I.4/4 - to our expression: we got for the Nominal Value Gamma of Our Standard [ref2007box], in terms of frequency, once more: RED points in the following Figures by using our [NanoVNA], BLUE points in the same Figures, by using our [VNA]: Magnitude : Argument : III The Nominal Values of Zinp for Our Standard [ref2007box]: By using the well-known formula : Zinp = Zo*(1+Gamma)/(1-Gamma) where Zinp and Gamma are, in general, Complex variables and Zo is the Real Nominal Value = 50 Ohm we got the two Parts of Zinp, as follows: Real Part : Imaginary Part : #30 : our final report 1 - 6 October 2019 : /g/nanovna-users/message/4179- - - end : (c) gin&pez@arg (cc-by-4.0) 2019 - - - - - - - - - - Sincerely, gin&pez@arg 50#
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Re: NanoVNA WebApp USB question
Well, Wes, to be honest, I don't have plans to put those resistors into mine Nano,
because I don't posses any host with USB-C socket yet ;-)
But I just opened case and must say it would be a paramount task - socket pitch distance seems to be 0.5mm,
so resistors should be as small as possible. Together with appropriate soldering & vision equipment...
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Re: NanoVNA WebApp USB question
Wes,
Thanks for the correction. I don;t knwo the location of the pulldown resistors but do don't plan on using a USB-C to USB-C cable.
Mike N2MS
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On October 16, 2019 at 5:01 PM N9KDY <n9kdy@...> wrote:
Just small correction - pulldown 5k1 resistors on NanoVNA Haven't opened the case yet. Please, which form factor SM 5.1k
resistors? Wish I had known this before I put that order in for SMA
connectors at Digi-Key.... I hate paying ten bucks shipping for fifty
cents-worth of parts.
--
Wes Will
N9KDY
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Re: NanoVNA WebApp USB question
Just small correction - pulldown 5k1 resistors on NanoVNA Haven't opened the case yet. Please, which form factor SM 5.1k resistors? Wish I had known this before I put that order in for SMA connectors at Digi-Key.... I hate paying ten bucks shipping for fifty cents-worth of parts. -- Wes Will N9KDY
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Re: NanoVNA WebApp USB question
On Wed, Oct 16, 2019 at 08:53 PM, n2msqrp wrote:
I've read issues about USB C to USB C connection issues without the 5.1k
pullup resistors
Just small correction - pulldown 5k1 resistors on NanoVNA socket.
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Hi Rune,
This note may explain what I mean.
I've got some other info that may be of help, but I can't find the document at the moment.
Regards,
Martin - G8JNJ
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Hello Rune,
Sorry for the confusion. I found the way to remove the Smith chart
display, operator error, hi. Yes, the R & X he asked for is what I use,
and the confusion is that the display of that will be as R and j(ohms).
Not mag and phase angle. Thanks.
Mel, K6KBE
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On Wed, Oct 16, 2019 at 12:07 PM Rune Broberg <mihtjel@...> wrote: Hi Mel,
I'm not entirely sure what you wanted to say with your comment, which
needed to be said, though? Was it related to series R + X, as requested by
Martin? I'm not sure where the Smith chart comes into it?
--
Rune
On Wed, 16 Oct 2019 at 19:59, Mel Farrer, K6KBE <farrermesa@...>
wrote:
The current display is in smith chart with Magnitude and phase, and or on
SWR just that, No R and j. R is the resistive component of the signal and
j is the computed reactive element in ohms of the phase. Yes, we can do it
off line of course, but both of my other VNA units will give me the R and j
directly. Being a RF nut, I don't use Smith charts in the design of
anything I use the R an j. The Smith chart is good for many things, but I
don't use it, I prefer to look at the Magnitude and the j as it is
displayed in a swept response of frequency. That is, I am mostly
interested in the j0 crossover that is the resonance of the load I am
putting into the analyzer.
Example: if I want to know the resonant frequency of a antenna, I do not
look for min SWR. That tells me nothing. Once I know the j0 frequency, I
then can address matching the R magnitude and I am done..... Sorry for the
long comment, but I think it needed to be said. Cheers,
Mel, K6KBE
On Wed, Oct 16, 2019 at 10:29 AM Rune Broberg <mihtjel@...> wrote:
Hi Martin,
I want to do more things with markers, including having the ability to add
more of them, and/or to change what information is being displayed. Not
sure it will be in the next release, but it's on the list.
I am a little confused, though - my background is not (at all) in RF tech:
Isn't Series R & X = Z? Which is already displayed? Or what are we talking
here?
--
Rune / 5Q5R
On Wed, 16 Oct 2019 at 17:18, Martin via Groups.Io <martin_ehrenfried=
[email protected]> wrote:
Hi Rune,
I just tried NanoVNA-Saver 0.1.3.
I think the new enhancements are a great improvement in terms of usability
and the fixed scaling options help prevent charts 'jumping around' all
over
the place when they auto scale, which make comparisons between plots
so
much easier.
Thanks for following up on the suggestions, much appreciated.
Cheeky ask - Any chance of adding Series R & X values to the markers
in
the next release :-)
Regards,
Martin - G8JNJ
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Right - it doesn't get set immediately when you connect. That's apparently
still a bug. But if you enter anything in the frequency input fields, it
should still update. :-)
--
Rune / 5Q5R
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On Wed, 16 Oct 2019 at 21:41, hwalker <herbwalker2476@...> wrote: On Wed, Oct 16, 2019 at 12:32 PM, Rune Broberg wrote:
Hi Herb,
I don't see an attachment :-) I have attempted to make the code more
resilient to that particular phenomenon, so if you can describe the exact
steps that cause it, that would be most appreciated!
--
Rune / 5Q5R
-----------------------------------------------------------
Forgot the attachment. In both 0.1.3 and 0.1.2 the "Hz/step" field is
blank. Prior to 0.1.2 the calculated value was shown in the field.
Herb
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Hi all,
I am confused about the remarks as well Rune. The current saver routine displays the Chart, the VSWR plot etc... with the MARKER DATA display providing the R+/- jX values. As well it provides the parallel equivalent admittance although expressed as a parallel Z.
In any case, all the information is properly displayed to go off and do an impedance match. That is to say you have the DUT Z or Y presented to you at a specific frequency and in a format that permits you to do either a real to real match or a real to complex match.
Prior, I agree, the vna gave Z as a real part and a C or L element value. Then you would have to figure the value of X for a specific frequency of interest. The save fixes that issue, I believe.
Alan
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On Wed, Oct 16, 2019 at 12:32 PM, Rune Broberg wrote:
Hi Herb,
I don't see an attachment :-) I have attempted to make the code more
resilient to that particular phenomenon, so if you can describe the exact
steps that cause it, that would be most appreciated!
--
Rune / 5Q5R
-----------------------------------------------------------
Forgot the attachment. In both 0.1.3 and 0.1.2 the "Hz/step" field is blank. Prior to 0.1.2 the calculated value was shown in the field. Herb
|
Hi Herb,
I don't see an attachment :-) I have attempted to make the code more
resilient to that particular phenomenon, so if you can describe the exact
steps that cause it, that would be most appreciated!
--
Rune / 5Q5R
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On Wed, 16 Oct 2019 at 20:24, hwalker <herbwalker2476@...> wrote: Rune,
As usual, kudo's on the latest 0.1.3 update. As I noted on the 0.1.2
update, the "Hz/step" value seems to have gotten lost (blank field), see
attached screenshot.
- Herb
|
Rune,
As usual, kudo's on the latest 0.1.3 update. As I noted on the 0.1.2 update, the "Hz/step" value seems to have gotten lost (blank field), see attached screenshot.
- Herb
|
Hi Mel, I'm not entirely sure what you wanted to say with your comment, which needed to be said, though? Was it related to series R + X, as requested by Martin? I'm not sure where the Smith chart comes into it? -- Rune On Wed, 16 Oct 2019 at 19:59, Mel Farrer, K6KBE <farrermesa@...> wrote: The current display is in smith chart with Magnitude and phase, and or on
SWR just that, No R and j. R is the resistive component of the signal and
j is the computed reactive element in ohms of the phase. Yes, we can do it
off line of course, but both of my other VNA units will give me the R and j
directly. Being a RF nut, I don't use Smith charts in the design of
anything I use the R an j. The Smith chart is good for many things, but I
don't use it, I prefer to look at the Magnitude and the j as it is
displayed in a swept response of frequency. That is, I am mostly
interested in the j0 crossover that is the resonance of the load I am
putting into the analyzer.
Example: if I want to know the resonant frequency of a antenna, I do not
look for min SWR. That tells me nothing. Once I know the j0 frequency, I
then can address matching the R magnitude and I am done..... Sorry for the
long comment, but I think it needed to be said. Cheers,
Mel, K6KBE
On Wed, Oct 16, 2019 at 10:29 AM Rune Broberg <mihtjel@...> wrote:
Hi Martin,
I want to do more things with markers, including having the ability to add
more of them, and/or to change what information is being displayed. Not
sure it will be in the next release, but it's on the list.
I am a little confused, though - my background is not (at all) in RF tech:
Isn't Series R & X = Z? Which is already displayed? Or what are we talking
here?
--
Rune / 5Q5R
On Wed, 16 Oct 2019 at 17:18, Martin via Groups.Io <martin_ehrenfried=
[email protected]> wrote:
Hi Rune,
I just tried NanoVNA-Saver 0.1.3.
I think the new enhancements are a great improvement in terms of usability
and the fixed scaling options help prevent charts 'jumping around' all over
the place when they auto scale, which make comparisons between plots so
much easier.
Thanks for following up on the suggestions, much appreciated.
Cheeky ask - Any chance of adding Series R & X values to the markers in
the next release :-)
Regards,
Martin - G8JNJ
|
A standard PC USB HD camera connected to your PC should be able to be re-focused for close-up work.You just need a stand to hold it above the item you're working on.Even the cheap ones from the dollar store should work if they are 640x480 or better.Just make sure they are the newer typeas that don't need any drivers (ie: UVC compatable)
Or - you can get an old stereo microscope from any surplus equipment store.
Regards,
Larry
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On Wednesday, October 16, 2019, 2:54:02 p.m. GMT-4, N9KDY <n9kdy@...> wrote: W5DXP wrote: Thanks Rune, when I said "considerable improvement" I was talking about the better visibility it provides OFs like me with macular degeneration, cataracts, etc. Yeah.? Me too.? Add in presbyopia to the "et cetera."? Which is where soldering a couple of less-than-rice-grain-sized resistors for the USB-C port fix becomes ... problematical. Luckily, I still have all my SMD soldering tools.? But I also now have a 10-diopter fluorescent-ring-tube-lighted 25cm-diameter magnifying glass which might allow me to attempt it. -- Wes Will N9KDY
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The current display is in smith chart with Magnitude and phase, and or on
SWR just that, No R and j. R is the resistive component of the signal and
j is the computed reactive element in ohms of the phase. Yes, we can do it
off line of course, but both of my other VNA units will give me the R and j
directly. Being a RF nut, I don't use Smith charts in the design of
anything I use the R an j. The Smith chart is good for many things, but I
don't use it, I prefer to look at the Magnitude and the j as it is
displayed in a swept response of frequency. That is, I am mostly
interested in the j0 crossover that is the resonance of the load I am
putting into the analyzer.
Example: if I want to know the resonant frequency of a antenna, I do not
look for min SWR. That tells me nothing. Once I know the j0 frequency, I
then can address matching the R magnitude and I am done..... Sorry for the
long comment, but I think it needed to be said. Cheers,
Mel, K6KBE
toggle quoted message
Show quoted text
On Wed, Oct 16, 2019 at 10:29 AM Rune Broberg <mihtjel@...> wrote: Hi Martin,
I want to do more things with markers, including having the ability to add
more of them, and/or to change what information is being displayed. Not
sure it will be in the next release, but it's on the list.
I am a little confused, though - my background is not (at all) in RF tech:
Isn't Series R & X = Z? Which is already displayed? Or what are we talking
here?
--
Rune / 5Q5R
On Wed, 16 Oct 2019 at 17:18, Martin via Groups.Io <martin_ehrenfried=
[email protected]> wrote:
Hi Rune,
I just tried NanoVNA-Saver 0.1.3.
I think the new enhancements are a great improvement in terms of usability
and the fixed scaling options help prevent charts 'jumping around' all over
the place when they auto scale, which make comparisons between plots so
much easier.
Thanks for following up on the suggestions, much appreciated.
Cheeky ask - Any chance of adding Series R & X values to the markers in
the next release :-)
Regards,
Martin - G8JNJ
|
Re: Any ideas for test jigs?
Getting Ft from measured S data is pretty straight forward. The key is you DO NOT NEED TO MEASURE TO THE POINT OF UNITY CURRENT GAIN!
Simply take a couple of points say at 10 MHz and 100 MHz. You will need the full 2 port S data at 10 and 100 MHz. Then convert that data to H parameters and fetch the h21 parameter. Check to be sure that the roll off rate between 10 and 100 MHz is 20 dB. It should be, if not you have a fundamental problem from the get go.
Then simply extrapolate the roll off until the h21 parameter goes to unity. Viola' the ft value.
If you need clarification on this stuff, let me know.
|
gin&pez@arg
