Re: Will a nanoVNA work above 1500MHz?
Thank you for the link.
I could not run the program. Many of the menue options do not respond.
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Advice sought on specific measurement.
I want to use my NanoVNA to determine if the cables I use in my lab are good enough, like the correct Z, no sharp bends or crushed dielectric or bad connectors, and so on.
My first vague idea was to
1. Calibrate solt for a plane at the end of a short cable.
2. Connect the cable under test, the CUT, to the end of the short cable in 1.
3. Connect something, (short, open, load?) at the end of the CUT.
And then know what a perfect CUT with Zc= the load test R would look like on the NanoVNA display.
And that I don't know.
Can you advice on this?
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Hi Rune , I get the last version , and I will test the average function as son as possible.
Many thanks for the very good application . Next week I wil measure a notch FM filter
using the nanoVNA using nanosaver , and also an hp8752B . I will compare the measures
and post the graphics.
Best regards
Maurizio IZ1MDJ
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Hi Rune Absolutely an enjoyment to use. Keep up the good work Have not yet tried the calibration, will do. Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] < [email protected]> P? vegne af Rune Broberg Sendt: 22. september 2019 09:26 Til: [email protected]Emne: Re: [nanovna-users] NanoVNA Saver Hi Kurt, thank you for trying out the app! I'll certainly consider a way to lock the markers out of mouse control. I'm looking into zooming/scaling of the plots, but I don't have a great solution figured out yet. I hope you enjoy using the software :-) -- Rune / 5Q5R
On Sat, 21 Sep 2019 at 11:58, Kurt Poulsen <kurt@...> wrote: Hi Rune
V0.0.10 works fine, thank you.
May I suggest that the selection dots for the markers had a toggle
function such that when these was not marked the were locked and when
marked the marker was moveable. Alternative a further line called lock
markers. My eager right hand fingers hit very often the left mouse key
and the active marker is suddenly somewhere else.
Also if the vertical unit were scaleable would be nice e.g. to have
selectable dB ranges in steps or freely selectable. Same applies for
polar plot to e.g. to be able to study a load close in if inductive or
capacitive or both.
Kind regards
Kurt
-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af
Rune Broberg
Sendt: 18. september 2019 22:36
Til: [email protected]
Emne: Re: [nanovna-users] NanoVNA Saver
I just released 0.0.10:
It's not the most exciting release, but it offers some quality of life
improvements, such as the ability to choose the font size
(particularly useful for Linux users, whose default is a massive 11 pt font).
It also adds debug logging: -d to get log messages to the terminal, or
-D filename.txt to log to a file. Useful if you see crashes!
Additionally, it now supports importing magnitude/angle touchstone
files, and there's been a number of little bugfixes.
As ever, I look forward to hearing what bugs you find, and what new
features you want! :-)
--
Rune / 5Q5R
On Wed, 18 Sep 2019 at 18:05, hwalker <herbwalker2476@...> wrote:
Rune,
The new "Using the software" section on your GitHub page (
) is much appreciated! The
new pip installation also is nice, although on Windows I prefer to
just download your release and run the executable from my "C:\NanoVNA" directory.
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Re: Finger tightening SMA connections
If you get the "thin sma spanner tool" at like 3-4 GBP from sdr-kits, and
you have a dynamometer capable of measuring 6N accurately, you can actually
get a fairly accurate .3 Nm pulling at the tiny hole with the spanner
attached to an SMA collar nut, the spanner as vertical as possible and
pulling the dynamometer horizontally.
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Hi Steve,
as I see Herb has informed you already, there's currently no executables
for the 10a-version, which is my development branch. "a" at the end
generally indicates that it's between releases - I've started doing this
just to keep track of what app I'm myself running when checking for bugs ;-)
If you do wish to run the latest, greatest (and most unstable!) version,
the readme contains very superficial instructions. It requires having
Python 3.7 and git installed, and knowing how to use it is a good idea. For
most users, at the rate I'm currently managing to make releases, I
recommend waiting for the .exe.
These features should be out in a proper release within the next 48 hours.
:-)
--
Rune / 5Q5R
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On Sun, 22 Sep 2019 at 00:55, WB8GRS <ssedgwick@...> wrote: hwalker,
Where do you find NanoVNA Saver 0.0.10a.exe ? I went here:
and see 0.0.10 but not
0.0.10a. Would love to have the whole screen fit in my 1366X768 screen.
Rune,
Thank you so much for fitting the whole screen into a 1366x768 screen.
That will really make the NanoVNA Saver software so much easier to use.
Thanks,
Steve_WB8GRS
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Hi Maurizio,
thank you very much! Exactly the kind of thing I was looking for. It seems
my current implementation in the development version isn't far off from
what Keysight do; though I do need to set up the IIF/IIR for
continuous/live sweeping.
--
Rune / 5Q5R
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On Sat, 21 Sep 2019 at 23:48, Maurizio IZ1MDJ <redifon500@...> wrote: Hi , I found some info about the smoothing and average on Keysight network
analyzer at this link :
Best regards
Maurizio
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Hi Herb,
thank you for the feedback and the suggestion. It's good to hear that it's
starting to fit on 1366x768! I have received other comments indicating that
being able to store "comments" about sweeps was a desired feature, and I'll
definitely look at adding it. The charts should all have some room at the
top for a header as well. :-)
--
Rune
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On Sat, 21 Sep 2019 at 23:19, hwalker <herbwalker2476@...> wrote: Rune,
I just checked out your Latest commit, 0.0.10a and loving the fact that on
my 1366x768 display I can see the whole screen without needing scrollbars.
All the charts size very nicely at font size 7, even with show data
turned. I think the pop up windows for Files, Calibration, Display setup,
and About are nicely thought out. I wish at some point in the future you
could add a setting under "Display setup" that would allow the user to add
a centered caption at the top of the graphs for documentation purposes.
Keep up the great work!
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Hi Logan,
thank you for the suggestion. Implementing "bold" probably wouldn't be a
big problem. I have previously implemented "scaling" for high def monitors
on advice of other users, which should allow operating system scaling to
work without major problems, at least for Windows. I make no promises, but
you might have a look at this in the meantime?
Also, thank you very much for suggesting that I'm getting close to positive
integer major version territory - at times, I still feel very far off ;-)
--
Rune / 5Q5R
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On Sat, 21 Sep 2019 at 23:09, kz6oscar <lrahnz@...> wrote: Rune,
Thanks for all of your work on this. I know from personal experience the
effort and dedication that something like this requires. When I bought my
NanoVNA, I had no idea that I was "surfing" the early adopters wave. I am a
recently retired electrical engineer and the intellectual stimulation has
been welcome, especially when dealing with a well designed software
application like yours. The "bleeding edge" apps are not always this well
thought out. It is quickly getting to the point where the first digit of
the version number can be an integer greater than zero.
I do have a suggestion....
I have a 4k UHD monitor and one of the issues that I have is that most
apps use fonts that have a single pixel stroke width which can be quite
hard to read. I know that you have a font size option, which helps,
however, I found that simply going to the Bold version of a font can widen
the font stroke width and make big improvements in readability on a UHD
monitor without changing the font size. Perhaps, you could put this option
on your to do list for a future version.
73
Logan, KE7AZ
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Hi Jim,
I've studied the file, and it seems the same values were used for the
different calibration standards (OSL as well as I&T).
In a fit of poor design philosophy, I initially elected *not* to let the
buttons in the calibration screen run the sweep for you, but to expect the
user to do this manually for each standard before pressing the respective
button. It's become blatantly clear that this is completely unintuitive,
and I'll be looking at changing it - but for now, when you want to use
in-app calibration, make sure that you run a sweep for each standard, and
after each, press the relevant button in the calibration window. That's
currently the only way to get a valid in-app calibration.
I'll make a better interface for it, but it probably won't be for a couple
of releases (ie. not this coming week ;-)
--
Rune / 5Q5R
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On Sat, 21 Sep 2019 at 22:33, <jimcking@...> wrote: Hi Rune,
Attached is the calibration File.
Thanks Again.
Jim K. K8SLC
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Re: nanoVNA Output Voltage
Here is my measurements:
50 Ohm load, sweep 50k-900M:
Peak voltage: 182 mVpp
RMS voltage: 92 mVrms
So, the max power level about -7.7 dBm
1 MOhm 18pF load, sweep 50k-900M:
Peak voltage: 324 mVpp
RMS voltage: 165.3 mVrms
So, the max power level about -45 dBm (note, 1 Mohm load!)
According to these values, the output impedance of CH0 is about 39 Ohm.
Measured with 100 MHz bandwidth scope, so the real voltage may be a little higher.
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Hi Kurt,
thank you for trying out the app! I'll certainly consider a way to lock the
markers out of mouse control. I'm looking into zooming/scaling of the
plots, but I don't have a great solution figured out yet.
I hope you enjoy using the software :-)
--
Rune / 5Q5R
toggle quoted message
Show quoted text
On Sat, 21 Sep 2019 at 11:58, Kurt Poulsen <kurt@...> wrote: Hi Rune
V0.0.10 works fine, thank you.
May I suggest that the selection dots for the markers had a toggle
function such that when these was not marked the were locked and when
marked the marker was moveable. Alternative a further line called lock
markers. My eager right hand fingers hit very often the left mouse key and
the active marker is suddenly somewhere else.
Also if the vertical unit were scaleable would be nice e.g. to have
selectable dB ranges in steps or freely selectable. Same applies for polar
plot to e.g. to be able to study a load close in if inductive or capacitive
or both.
Kind regards
Kurt
-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Rune
Broberg
Sendt: 18. september 2019 22:36
Til: [email protected]
Emne: Re: [nanovna-users] NanoVNA Saver
I just released 0.0.10:
It's not the most exciting release, but it offers some quality of life
improvements, such as the ability to choose the font size (particularly
useful for Linux users, whose default is a massive 11 pt font).
It also adds debug logging: -d to get log messages to the terminal, or -D
filename.txt to log to a file. Useful if you see crashes!
Additionally, it now supports importing magnitude/angle touchstone files,
and there's been a number of little bugfixes.
As ever, I look forward to hearing what bugs you find, and what new
features you want! :-)
--
Rune / 5Q5R
On Wed, 18 Sep 2019 at 18:05, hwalker <herbwalker2476@...> wrote:
Rune,
The new "Using the software" section on your GitHub page (
) is much appreciated! The
new pip installation also is nice, although on Windows I prefer to
just download your release and run the executable from my "C:\NanoVNA" directory.
|
Re: Does anyone know how sensitive the nanovna is to electrostatic discharge?
Dr. David Kirkby from Kirkby Microwave Ltd
On Sun, 22 Sep 2019 at 08:10, Dr. David Kirkby < drkirkby@...> wrote:
I fail to see the need to worry if the active devices is connected across
a 50 ohm resistor. 50 ohms is effectively a short circuit as far as static
is concerned.
Here¡¯s a video from dave Jones of EEVBLOG measuring the DC resistance of
antistatic mats.
Two DVM probes are put next to each other, the meter, which can read upto
300 M ohm can measure anything.
I should have said that the meter can not measure the resistance - it is over 300 M ohm. You are not going to zap the NanoVNA with static on its RF input terminals. -- 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: RX-Port Input Impedance
yes, my NanoVNA CH1 also has VSWR=1.3 at 900 MHz. You can measure it by connect CH0 to CH1 with a good quality and short cable.
Also, according to my CH0 output voltage measurement, the output impedance of CH0 is about 39 Ohm. But it may be not very precise, because I measured it with 100 MHz bandwidth oscilloscope.
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Re: Does anyone know how sensitive the nanovna is to electrostatic discharge?
Dr. David Kirkby from Kirkby Microwave Ltd
On Fri, 20 Sep 2019 at 03:52, bryburns via Groups.Io <bryburns= [email protected]> wrote: When a VNA is connected to an antenna (often they are outdoors) there are
some potential issues with electrostatic discharge (ESD.) In dry areas of
the world ESD can be an issue even when working with objects that are
purely indoors. I have seen issues when working on tables indoors. Other
VNA devices are known to have issues. Does anyone know how sensitive the
RF inputs to the nanovna are with regard to ESD? Is there any ESD
protection built into the RF connections on the nanovna?
--
Bryan, WA5VAH I fail to see the need to worry if the active devices is connected across a 50 ohm resistor. 50 ohms is effectively a short circuit as far as static is concerned. Here¡¯s a video from dave Jones of EEVBLOG measuring the DC resistance of antistatic mats. Two DVM probes are put next to each other, the meter, which can read upto 300 M ohm can measure anything. What is more an issue is having the NanoVNA connected to an antenna in the presence of another transmitter locally. But that¡¯s another issue thing altogether 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: Does anyone know how sensitive the nanovna is to electrostatic discharge?
On Sun, Sep 22, 2019 at 03:26 AM, <bryburns@...> wrote:
I would think that the current will be even less when we apply ~-10 dBm or 0.1
v pk signals to it. 0.1 v is approximately 35 dB smaller than 6 V.
As I know there is no diode in the world that can protect wide bandwidth RF input with no dynamic range degradation and no IMD distortions. Otherwise it will be used in a wide range of sensitive RF equipment. Usually low flicker noise high speed Schottky diodes are used for such purpose, for example HSMS2812 or something like that. But they also reduce dynamic range of the signal. As for voltage suppressors, once I tried 82V voltage suppressor for 10V transmission line, but it has so high IMD distortion, so digital signal completely unreadable. PS: as for NanoVNA output level, it has peak output about 324 mVpp on 1 MOhm/18 pF load. Such level can open some diodes
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Re: Does anyone know how sensitive the nanovna is to electrostatic discharge?
If you want to try out the GB1010603 devices, they are available on eBay as item?111468959425. The price for ten shipped in the USA is?$4.85. I am not associated with the seller.?They should be very effective in protecting sensitive RF devices and equipment. These devices are are surface mount, size 603.
Stuart K6YAZLos Angeles, USA
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-----Original Message----- From: bryburns via Groups.Io <bryburns@...> To: nanovna-users < [email protected]> Sent: Sat, Sep 21, 2019 5:26 pm Subject: Re: [nanovna-users] Does anyone know how sensitive the nanovna is to electrostatic discharge? qrp.ddc Thanks for your reply.? I agree it would be very detrimental to the our measurements to put a diode in place that has 10-15 pF of capacitance. I would never recommend that. Apparently you did not look at the data sheet for the PGB1010603 device I attached above.? I did not assume it was 0.06 pf.? On page 1 of the data sheet the measured capacitance for the device is 0.06 pf when measured at 250 MHz.? At that frequency this corresponds to a reactance of a little over 10,000 ohms.? Surely this won't have much impact on measurements in a 50 ohm system at that frequency.? Therefore, it appears that this device is substantially different from those with which you are familiar. I agree we should not use typical voltage suppressor diodes to protect the input to VNA devices.? They produce large non-linearities which can really screw up measurements. Please follow my thinking for a minute.? The first page of the data sheet for the device says that the "leakage" current through the device will be less than 1 nano amp at 6 volts.? I would think that the current will be even less when we apply ~-10 dBm or 0.1 v pk signals to it.? 0.1 v is approximately 35 dB smaller than 6 V.? But, let's assume it is still 1 nano amp. This corresponds to a power level of about -100 dBw or -70 dBm peak power.? This is approximately 60 dB below the signal being applied to the circuit we are testing.? This still seems like a very low power in the diode for creating mixing products.? I don't think any mixing products can be larger than this amplitude, in fact, I think they have to be smaller. Perhaps I did not ask my question above regarding assumptions clearly.? I am not an expert on how VNA calibration works.? I hope you are.? If there is variation in stray capacitance on the VNA input of a fraction of a pF for any reason (manufacturing tolerances, component variations, etc.), will the OSLT calibration we commonly use with devices such as nanovna compensate for it in our measurements after calibration?? Is some other action required on my part?? I thought this is one of the very purposes of OSLT calibration in all VNAs. -- Bryan, WA5VAH
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Re: New owner of the Nano VNA
William,
The nanoVNA can easily perform the VSWR measurements you bought it for, but because it can do so much more you are going to have to invest some time and study learning its operation and menu structure. You might start out with this link, . Pay special attention to the calibration procedure. Without a properly calibrated unit your test results will make you want to give up on using the nanoVNA pretty quickly. On the left hand side of this groups page are some excellent resources, in particular ensure you browse through the "Files" and "Wiki" sections. The members of this group are more helpful and knowledgeable than any I've joined in the past. The total messages are already up to 2821 in the relatively short time the group has been formed. Reading through all the messages is an education in itself. Welcome to the party.
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Re: New owner of the Nano VNA
Also, how do I use this on my PC? I've downloaded the software but can't seem to be able to figure out what to do next.
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New owner of the Nano VNA
I received my little gadget today. I'm not familiar with this type equipment and am trying to figure how to use it. I've watched a video on line and got a little info on it. I've run a test on my OCF wire antenna getting the SWR readings. I'm not certain I got accurate readings as they don't compare with the readings my radio shows. Can anyone help guide me through how to check my SWRs? Maybe later I'll try learning other things I can use this for. Thanks for any help.
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Kurt Poulsen
