开云体育

Ooooopps...... I looked at the picture but saw what I expected: Coax.
Thanks, Stan, for bringing this to my attention.

Test just like my common mode chokes on toroids. Either or both wires will
do.

Dave - W?LEV

On Tue, Apr 15, 2025 at 8:28?PM Stan Dye via groups.io <standye=
[email protected]> wrote:

In this case, Dave, if you look at his picture, he is using two wires for
the choke conductors, not a coax. So either or both wires together should
work.

--

*Dave - W?LEV*


--
Dave - W?LEV

The jog wheel is an a control that allows an alternate way to bring up the menu and select the menu items.
So if you are happy with doing it on the touch screen, you are not missing much. There are some things that are (to me) more convenient with the jog wheel, such as moving / positioning the cursor, etc.
You can probably replace the jog wheel if you want to - or maybe just touching up its solder joints to the main board would restore functionality.

In this case, Dave, if you look at his picture, he is using two wires for the choke conductors, not a coax. So either or both wires together should work.

To clarify, it's a NanoVNA H (classic) and matches the image for a good model in the Wiki.

--
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Do Justly Love Mercy. Walk Humbly.

I have a NanoVNA (2.8" screen) from about 2020. Overall it works well, but the Jog Switch doesn't do anything.

The touch screen works fine, it calibrates OK and measures SWR with ease... but the jog switch doesn't do anything. Should it do anything?

Firmware is reasonably current with version 1.2.43 (p: 101 IF: 12k, ADC: 192K, Lcd:320x240)
Build time: Feb 19 2025 - 21:39:08

Am I missing anything by just using it via touch screen? An inquiring mind wants to know!

--
---
Do Justly Love Mercy. Walk Humbly.

Since the center conductor closes fields to the interior surface of the
coax shield, it does not interact with external fields. Therefore, it's
only necessary to connect the outer shield between the two ports of the
NANOVNA. Don't be concerned about the center conductor.

Yes, you should measure S21 at something greater than -20 dB (more negative
is more better).

Dave - W?LEV

On Mon, Apr 14, 2025 at 12:47?AM Stan Dye via groups.io <standye=
[email protected]> wrote:

I do a 'loss' measurement rather than an impedance measurement. To do
this, do a 'through' measurement (S21), either on a single wire, or both
wires together, connected to the center pins of the nanovna leads - either
measurement method should show you the same results. The ground (shield)
of the leads to the nanovna should be connected together. A good choke
should give >20dB of S21 loss across the frequency range of interest - the
more loss (attenuation) the better.

--

*Dave - W?LEV*


--
Dave - W?LEV

I do a 'loss' measurement rather than an impedance measurement. To do this, do a 'through' measurement (S21), either on a single wire, or both wires together, connected to the center pins of the nanovna leads - either measurement method should show you the same results. The ground (shield) of the leads to the nanovna should be connected together. A good choke should give >20dB of S21 loss across the frequency range of interest - the more loss (attenuation) the better.

I have made a Maxwell choke for my ladder line feed to my doublet. I would like to check the common mode impedance with the nanovna. Do I just use one of the wires for the reading or both? A diagram of it is in the photos section. It looks like this....
/g/nanovna-users/album?id=301856

John K0JHL

On Sun, Apr 13, 2025 at 02:14 PM, CLIFTON HEAD wrote:
Hi you con download the nanovna-App at



some time is sufficient to search on the messages of one of the io.groups devoted to nanovna .
Maurizio IZ1MDJ

I have problems with the NanoVNAsaver this would be helpful. The app that
comes up is under development
I see nothing more. Can you please give a link for what your talking about.

________________________________
From: [email protected] on behalf of Roger Need via groups.io
Sent: Sunday, April 13, 2025 12:47 AM
To: [email protected]
Subject: Re: [nanovna-users] Windows 11 & NanoVNA H4

Mark,
If you use NanoVNA app (not NanoVNA Saver) you can remote the screen to your
PC. If you have a projector or large TV display then your audience can see
what you are doing right on the NanoVNA itself.

Roger

I have problems with the NanoVNAsaver this would be helpful. The app that comes up is under development
I see nothing more. Can you please give a link for what your talking about.

________________________________
From: [email protected] on behalf of Roger Need via groups.io
Sent: Sunday, April 13, 2025 12:47 AM
To: [email protected]
Subject: Re: [nanovna-users] Windows 11 & NanoVNA H4

Mark,
If you use NanoVNA app (not NanoVNA Saver) you can remote the screen to your PC. If you have a projector or large TV display then your audience can see what you are doing right on the NanoVNA itself.

Roger

Mark,
If you use NanoVNA app (not NanoVNA Saver) you can remote the screen to your PC. If you have a projector or large TV display then your audience can see what you are doing right on the NanoVNA itself.

Roger

Dean,

Had a look at the NanoVNAsaver page. The wiki does not seem to have a 'How
to get started page'. Can you please give some tips for getting started?

73

Jon, VU2JO

On Sat, Apr 12, 2025 at 6:45?PM Dean - KC9REN via groups.io <deanberg2044=
[email protected]> wrote:

Mark, I know of NanoVNAsaver as software
to be run on your laptop. There is a little bit of a learning curve using
the software but there are a number of Youtube videos on the subject too.
Once you use it, you will like it even more than just poking at the NanoVNA
screen. So much more info is shown on the computer. There may be other
software packages but I'm not aware of any at this time. Good luck on your
presentation.
Dean - KC9REN

Mark, I know of NanoVNAsaver as software to be run on your laptop. There is a little bit of a learning curve using the software but there are a number of Youtube videos on the subject too. Once you use it, you will like it even more than just poking at the NanoVNA screen. So much more info is shown on the computer. There may be other software packages but I'm not aware of any at this time. Good luck on your presentation.
Dean - KC9REN

You're right Brian, I'm sending you an email.

Thanks Jeff for the clarification, I did not understand this line nor why it was in the sheet. It's clearer now!

If you are planning on presenting the directivity and radiation pattern of
the loop, that is a better job for the TINYSA, not the NANOVNA. The
NANOVNA works in impedance space. A SA operates in the frequency space and
can easily represent amplitude as well. I believe the latter is what you
are attempting to illustrate in a live demo.

Dave - W?LEV

On Fri, Apr 11, 2025 at 12:52?PM Mark via groups.io <KD5SMF=
[email protected]> wrote:

I'm new to the group, and also a new user of the H4. I am building a
magnetic loop antenna and will be doing a presentation at our ham radio
club about the antenna. I would like to show the test results during a live
demonstration in the classroom with the antenna attached to the Nano H4
through my laptop.
I have not tried to hook up the Nano VNA H4 to my laptop yet. However, I
know that it is possible to do so. Is there any drivers that I need to
download, or usb ports to configure? I can navigate the VNA pretty well
for basic testing without the laptop. I will be connected to the
Universities in class computer from my laptop with a HDMI cable to display
the Nano's results.
I'm hoping to make a stellar presentation so please offer guidance.
73's
Mark kd5smf

--

*Dave - W?LEV*


--
Dave - W?LEV

No problem connecting to USB, but you’ll need to choose some software to run on the PC. ?THere’s a NanoVNA App, NanoVNA-Saver (which is python under the hood), and probably others.
the user interface is different on the apps than on the vna itself (more room on the screen to spread things out)
One thing that seems to get some people (including me) is that not all USB cables are created equal - some seem only to support charging - they don’t have the data wires in them. So you might need to try more than one cable, and you should definitely test the cable you’ll use in your demo.

For what it’s worth, the NanoVNA was used to good advantage at University of Alberta during COVID. Each student got a package with soldering iron, dmm, nanovna, parts, etc. and they did all their labs at home, with the (remote) help of TAs on call. It was hugely successful.

using NanoVNA in University classes ( /g/nanovna-users/message/25257 )
groups.io ( /g/nanovna-users/message/25257 )

( /g/nanovna-users/message/25257 )

I'm new to the group, and also a new user of the H4. I am building a magnetic loop antenna and will be doing a presentation at our ham radio club about the antenna. I would like to show the test results during a live demonstration in the classroom with the antenna attached to the Nano H4 through my laptop.
I have not tried to hook up the Nano VNA H4 to my laptop yet. However, I know that it is possible to do so. Is there any drivers that I need to download, or usb ports to configure? I can navigate the VNA pretty well for basic testing without the laptop. I will be connected to the Universities in class computer from my laptop with a HDMI cable to display the Nano's results.
I'm hoping to make a stellar presentation so please offer guidance.
73's
Mark kd5smf

L2 gets aligned at 98.2MHz @ 22.5kHz modulation but at an unknown level,

The alignment instructions say it "shall be carried out below the limiting value", ie a weak signal that does not cause the IF to hit the point where limiting occurs, or in other words a noisy signal to the ear.

Regards
Jeff G8HUL

AArnaud, let's continue this off-forum since it no longer involves a NanoVNA. My email address is at the end of this page:



Brian

The instructions are not the clearest, I've included them in case although that may be off topic. L2 gets aligned at 98.2MHz @ 22.5kHz modulation but at an unknown level, I suppose you're right Brian this is probably at a very weak signal. Perhaps lower it progressively and adjust for best sensitivity ? Official spec is 0.9?V for 26dB SNR

I was wrong, the FM impedance is actually 60ohm. The 150ohm is actually the AM Tuner. My bad.

Note in the second steps they do not mention the dummy for the basic IF alignment, but then it is mentioned for the phase shifter and much of the rest. No specs are given for the dummy, I've looked into many other manuals of the same period and they still don't say what is inside, but we can learn the dummy is powered by 12V for FM alignment and has no attenuation (for AM no 12V and a 6dB attenuation). They call it dummy antenna or matching device sometimes. One thing is they list Meguro and Leader signal generator, both of which were 50ohms, not 60.

Considering my Marconi is 50ohm, i suspect this may be an acceptable mismatch? But Blaupunkt didn't think so?

While at it, really off topic this time, how exactly does step 4 of the Basic IF alignment works? "Use frequency adjuster of the signal generator to adjust the AM minimum" Change carrier to have minimum amplitude?

Thanks a lot for taking some of your time to answer my questions, really appreciate it.