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Hello Guys,

I've one question which puzzles me, and was unable to find information neihter in the forum nor in the Wiki.
Since the NanoVNA outputs a rectagular signal which's harmonics are not neglectable and has no selective input (what I can see from the schematic is broadband), how can the S12 and S21 measurements be accurate as all the harmonics of the output will go into the mesurement at the input.

What do I have overseen?

Thanks for bringing me on the right track

Jens DF9HJ

I see in NanoVNA-Saver screenshot frequency range 50-52MHz

Earle D Wilkinson
(6Y5EW)

Home page:
Email address: earle.wilkinson@...
Echolink: 6Y5RA

On Mon, Dec 20, 2021, 3:18 AM Earle Wilkinson <earle.wilkinson@...>
wrote:

New at this.

I got myself an NanoVNA 2 version 4.
Everyone says best thing ever happened.

Better than sliced cheese.

My problem is that I a sticular when it comes to accuracy.

I would like to check my club stations duplexer accuracy on 147.960 high
pass filter with 147.360 as the split on the low pass filter, that is minus
600 kc split.

Now her is my problem I can only set my markers at 147.300 and 147.900.
Not the exact repeater frequency.

Will the difference of 60 hz make a difference in the accuracy of the
tuning insertion loss etc.

I realise that I need to be accurate at least with the 50 ohms impedance.

Thanks for your response.
Earle D Wilkinson
(6Y5EW)

Home page:
Email address: earle.wilkinson@...
Echolink: 6Y5RA

Hi All!

I am now evaluating a 1:6 UNUN with NanoVNA that I bought quite recently. The UNUN is made of two stacked FT240-61 and 1.6mm copper wire with 100pF capacitor in the primary. To measure SWR, a 1800 ohm carbon resistor is soldered in the secondary side. To my surprise, SWR is 1.0 from 1.9MHz to 430MHz. I suspect I misunderstood how to measure SWR with NanoVNA. I am attaching the screen of NanoVNA Saver. Any comments are welcome. Thank you.

Henry JF1XCV

After connectiin to PC, NanoVNA must see as additional COM port, you can check this in device manager.
If no additional ports in, check uncnown devices, and update drivers.

For USB connection baud rate not used (ignored)

Larry,

Sorry to see that your post got hijacked and went off topic!

I want to than you for the work you did putting this DiSlord updates document together. Very interesting to see how the firmware has evolved.

Roger

My document is NOT on that website. The owner of that website attempted to hijack my thread and drive views and probably advertising revenue for himself.


On Sun., 19 Dec. 2021 at 4:34 p.m., Rick Murphy<k1mu.nospam@...> wrote: The language isn't changing because there is no English translation of this
article on the site.
The language choice menu "works" for content that has an English version,
and doesn't when it doesn't exist.
73,
? ? -Rick


On Sun, Dec 19, 2021 at 2:39 PM Donald S Brant Jr <dsbrantjr@...>
wrote:

Re:? language not changing, I have noticed some other sites where this is
happening, so there may be a more widespread issue.? Amazon Web Services
had an outage a week or so ago, and I noticed little things which were
broken a few days after; maybe it is happening again.
73, Don N2VGU

--
Rick Murphy, D. Sc., CISSP-ISSAP, K1MU/4, Annandale VA USA

On Sun, Dec 19, 2021 at 09:41 AM, Richard Groot wrote:

So (newbie here) I've seen some versions of nanoVNA that capture 1000 data
points rather than 101. What are the consequences of the larger number of
points?

Disadvantage
- with more points you get a slower sweep time.

Advantages -
- with more points the step size for a given frequency range is smaller so you get more plotting "definition". When measuring an antenna, for example, this will give a better estimate of the frequency with minimum SWR.

- also you can "zoom in" (without recalibrating) and get better results if you have more data points. For example if you have 401 calibrated points over frequency range "A" and then zoom in by a factor of four to frequency range "B" 100 of the points will be close to what you get if you calibrate and measure over frequency range "B" with a 100 point sweep. Three interpolated points will be also available.

Roger

DisLord

excuse me for using your post. I need a clue why Nanovnasaver will not connect to usb port on my win 7 machine.

I have win-7 SP1 plus C++ and Net+ installed and I also ran the Cypress USB installer.

On the saver application no comm ports show up and typing in the allocated port number does nothing.

The QT version always connects OK.

I spotted your post re the app by one-of-eleven and downloaded that program. It connects ok too?

Checking the uSB port settings, the only difference between Nanovna saver and the above application is the baud rate?

So I am not sure what to do next, any ideas?

regards

joe

You not install 32768 quartz for rtc

If you not plane install it, remove battery, wait 10sec and put it back.
This reset lse mode to lsi

The language isn't changing because there is no English translation of this
article on the site.
The language choice menu "works" for content that has an English version,
and doesn't when it doesn't exist.
73,
-Rick


On Sun, Dec 19, 2021 at 2:39 PM Donald S Brant Jr <dsbrantjr@...>
wrote:

Re: language not changing, I have noticed some other sites where this is
happening, so there may be a more widespread issue. Amazon Web Services
had an outage a week or so ago, and I noticed little things which were
broken a few days after; maybe it is happening again.
73, Don N2VGU

--
Rick Murphy, D. Sc., CISSP-ISSAP, K1MU/4, Annandale VA USA

Hi
I have installed the latest version on my Nanovna H v3.2
Everything seems OK except that I can not save date and time.
In VERSION , time is 2000/01/01 00:00:30 (LSE) and I can not change it

Any idea?
Regards, Corneliu

I can try understand source of problem. For this need:
Flash this debug firmware
Connect device to PC
Use NanoVNA-App (download from here )
Connect to device and open console (see image)
Try save on card on device
Copy log text and send it here

Re: Number of points, I do not know of any downside except perhaps a slower sweep. There are software applications which will take control of the VNA and allow a 10,001 or greater point sweep.
Having said that for most uses 101 or 201 points is perfectly suitable; many commercial VNAs had similar numbers of points and were perfectly useable.

73, Don N2VGU

Re: language not changing, I have noticed some other sites where this is happening, so there may be a more widespread issue. Amazon Web Services had an outage a week or so ago, and I noticed little things which were broken a few days after; maybe it is happening again.
73, Don N2VGU

I have flashed the latest firmware for my H4 and that went well but I am still unable to save a trace to the SD card. I consistently get the "fail write" error message. Has anyone tried to save to their SD card and did it work? Rudy N6LF

Hi Lawrence,
That's not my site.?
Gyula HA3HZ decided to hijack my thread to push his own outdated document, which has nothing to do with what I had posted (and very impolite, I might add).
It's his website and the translation has been broken for a while.?


On Sun., 19 Dec. 2021 at 10:36 a.m., Lawrance A. Schneider<llaassllaaass@...> wrote: Hi,

I just went to your site.? When I selected English, the language did not change.? I tried to reload and still (after selecting English) the language stayed the same.

Thank you,? ? larry

Tim,

*DO NOT* include denigrating comments directed at other list members in your posts. They will get you put on moderation, or banned, very quickly.

DaveD, co-owner

Rich AI7KI

I am probably more newbie than you and not qualified to answer the question. But I may be able to answer part of the question. I own a NanoVNA-H. The firmware supports more than ten different versions of NanoVNA; many of which have different sizes and resolution of display. On this forum, there are people that own a NanoVNA of each possible version.

I am too uneducated at this time explain all the different possibilities; perhaps another forum member can jump in and elaborate.

30 Billy


________________________________
From: [email protected] <[email protected]> on behalf of Richard Groot via groups.io <richgroot@...>
Sent: Sunday, December 19, 2021 11:26
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] NanoVNA as a Signal Generator

So (newbie here) I've seen some versions of nanoVNA that capture 1000 data
points rather than 101. What are the consequences of the larger number of
points?

Thanks,
Rich AI7KI

On Sun, Dec 19, 2021 at 9:48 AM Donald S Brant Jr <dsbrantjr@...>
wrote:

Stan: All very good comments. I would like to expand on your statement
regarding calibration interpolation. How "nice" a job it does depends
somewhat on the quality of the instrument and setup (cables, adapters,
etc.); If the setup is well-matched (to 50Ω) and low loss, and does not
have any resonances, the software will be able to interpolate well. I do
not believe that it will extrapolate outside of a calibrated range,
however.
But you need to keep in mind the sweep width and number of discrete
measurement points so that you do not miss an important feature by stepping
past it; this would be an issue with a narrowband filter or high-Q antenna
such as a tuned loop..

73, Don N2VGU

So (newbie here) I've seen some versions of nanoVNA that capture 1000 data
points rather than 101. What are the consequences of the larger number of
points?

Thanks,
Rich AI7KI

On Sun, Dec 19, 2021 at 9:48 AM Donald S Brant Jr <dsbrantjr@...>
wrote:

Stan: All very good comments. I would like to expand on your statement
regarding calibration interpolation. How "nice" a job it does depends
somewhat on the quality of the instrument and setup (cables, adapters,
etc.); If the setup is well-matched (to 50Ω) and low loss, and does not
have any resonances, the software will be able to interpolate well. I do
not believe that it will extrapolate outside of a calibrated range,
however.
But you need to keep in mind the sweep width and number of discrete
measurement points so that you do not miss an important feature by stepping
past it; this would be an issue with a narrowband filter or high-Q antenna
such as a tuned loop..

73, Don N2VGU