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Re: Confused Newbie - Connected

 

Dave,

This is the page

30, Billy


________________________________
From: [email protected] <[email protected]> on behalf of N5SE via groups.io <bwmoore@...>
Sent: Thursday, December 16, 2021 10:24
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie - Connected


Dave,

A click on the URL gives me a really long site titled "Upgrade NanoVNA use DFU
The first link on the page is:



Clicking this link gives me the page you show except the button "Get Software" is missing, Follow any of the links on the page take you to dead end links.

30, Billy


________________________________
From: [email protected] <[email protected]> on behalf of Dave VE3LHO via groups.io <dave@...>
Sent: Thursday, December 16, 2021 10:07
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie - Connected

Billy,

It seems like you are seeing different things than some of the rest of
us. For instance when I click on the first link on the page linked to I
am taken to a web page which has the following:

When I click on the button marked "Get Software" it takes me down the
page where I see another button labelled "Get Latest" which, when
clicked starts on a process which allows downloading the DfuSe Demo
software.

Hardly a dead link. What are you seeing?

Dave

*Re: Confused Newbie - Connected*
From: N5SE
<mailto:bwmoore@...?subject=Re:%20Confused%20Newbie%20-%20Connected>
Date: Thu, 16 Dec 2021 03:14:41 PST

kemon,

Not funny! All the links in this are DEAD LINKS!
30, Billy

[cid:9358d05c-7213-41a2-847a-197ba808c451][Billy Wayne Moore]

________________________________
From: [email protected] <[email protected]> on behalf of
kemon via groups.io <wan3802@...>
Sent: Wednesday, December 15, 2021 21:02
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie - Connected



i learn to flash firmware from this link. maybe it cam help you

dave.jpg

Re: Confused Newbie - Connected

 

Billy,

There is nothing wrong with any of the links in his email. You have an issue
with your browser.

Click on the his first link. When that page opens, right click on the word
'here'. Now left click on 'Save link as'. Select a destination on your PC
for the file. And just in case you don't recognize the file type; it is a
compressed file using the 7zip. You will need to unzip the file.

And while you have your browser open:

1. Left click on the Menu selector in the upper right corner of the Firefox
window. That is the 3 horizontal bars icon.
2. Now click on Settings near the bottom of the list of actions.
3. Scroll the General selections down to Files and Applications.
4. Now scroll so that the Applications section is on your screen.
5. Click on Compressed (zipped) Folder. Is the Action (right side) Always
Ask?
6. On the end of that line now there is a down pointed arrow head. Click on
it.
7. Click on Save File.
8. Now close the Settings Tab by clicking the X on the end of the Settings
Tab.

Now click on that same link or another one. You will no longer be given the
prompt to Open or Save a Compressed file while using Firefox. Your only
choice is to Save it.

73,
Bob
AK5U

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of N5SE
Sent: Wednesday, December 15, 2021 10:29 AM
To: [email protected]
Subject: Re: [nanovna-users] Confused Newbie - Connected

I have tried to download the NanoVNA-App as recommended by Larry Rothman. I
searched FireFox for "Nanovna-App".

Got:

1) => Got NanoVNA-App is the very powerful
windows software developed by OneOfEleven for NanoVNA and LibreVNA.

You can download the per-compiled software here. "here" leads to a full page
of machine code!

2) => NanoVNA-Web-Client / WebApp

NanoVNA-Web-Client/WebApp was developed by cho45 and can be used by
accessing using the latest version of
chrome browser.
(The link => blank page)

PLEASE ANYONE! Is there anyway to search for a simple PC download such as
NanoVNA-App with out multiple dead-ends and goobygook. In all my years, I
have never seen such unorganized and in-accessible data. I just do not
understand.

Do not try to tell me where to find NanoVNA-APP, please explain this filing
system and how it is organized in PLAIN SIMPLE terms. If you cannot use
actual URL's, then PLEASE do not answer with general terms. And if your
answer involves GITHUB, definitely use URL's. I have never used github.

Thanks in advance,
30, Billy

[cid:12814b77-0fbc-4158-b040-408ee0488153][Billy Wayne Moore]

________________________________
From: [email protected] <[email protected]> on behalf of N5SE
via groups.io <bwmoore@...>
Sent: Wednesday, December 15, 2021 09:58
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie - Connected

Larry,

I do not mean to be impertinent or insulting nor do I want to offend you, I
am only frustrated. The problem with your advice is always the SAME.
I quote you:

"I have modified the GUI of DefuseDemo and placed it in the files section.
My mod enables larger font and better description of the functions of the
buttons. Grab the zip'ed file and read the instructions."

You might as well as say "Go to FireFox", grab the zip'ed file!" You make a
high level generalized statement and expect someone who does not understand
a word you say to jump through the hoop and execute!

Now to explain, WHAT FILES SECTION? I go to
/g/nanovna-users and click on
/g/nanovna-users/files (THE FILES SECTION?). I get a
gobblygook of what could be write-ups; who knows from the explanations. I
see nothing about a zip file or Larry Rothman. I finally see down on entry
8, Firmware. So I click on it. I see five entries with Larry Rothman as
author; all leading to PDF files. four of these five have firmware in them,
alas which one?
1) First one goes to "hugen's firmware release notes as of Oct 9, 2019" and
has a link to " which is
non-clickable. I copied it, went to it, more gobblygook.
2) Second goes to "Groups.io Maintenance, Groups.io is currently undergoing
maintenance. We apologize for the downtime, and expect to be back shortly.,
To see some cats, click here" Yes, it actually says "cats". Been here
before, never goes away or changes!
3) Third, same as Second!
4) Just quit and give up on this frustrating trip.

Larry, when dealing with a Newbie, you have to present a clear map to
follow. PLEASE copy and post a clear, specific starting URL. Then YOU click
on each URL and post the next specific URL and the specific full name of the
item to click on. Continue doing this until you have led the Newbie to the
destination desired. Then give the full name to download. You have not even
given the name of the zip file to download, I do not even know what I am
looking for! I am so frustrated, I am ready to quit!

I do understand you want to and are trying to help. This often happens when
a professional tries to help a layman. You cannot comprehend of anyone not
understanding the terms you use. I had a Physics Professor that used to
write a complicated expression on the board; stand back and look at it; say
the answer is CLEAR; write CLEAR on the board; say QED, and write QED on the
board. The class got up a petition to the Professor requesting him to go
through each step solving the equation before reaching the QED. Next class,
he wrote one of his famous equations on the board; stepped back and looked
at it; stated CLEAR as 1+1=2; wrote CLEAR as 1+1=2 QED on the board; and
said class dismissed. Talking to the Professor later, he REALLY thought he
was meeting the petition request.

Larry, I feel I back in that class, but I must sincerely thank you for what
you do, 30, Billy



________________________________
From: [email protected] <[email protected]> on behalf of Larry
Rothman via groups.io <nlroth@...>
Sent: Wednesday, December 15, 2021 08:34
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie - Connected

Billy, you can use DeFuse-demo to flash your FW or you can install and use
Nanovna-App to do it. There are various message threads in the forum and
user guides detailing how to do this. Use whatever method is easiest for
you.
I have used all the methods to see how each works.
I have modified the GUI of DefuseDemo and placed it in the files section. My
mod enables larger font and better description of the functions of the
buttons. Grab the zip'ed file and read the instructions.
As for what to use to start with - try a number of PC apps aver time to see
what you're most comfortable with. The Nanovna-App has the most functions
but the NanovnaSaver app is written in Python and can be modified. Both are
on github and are opensource.

Refer to the end of the forum wiki for a listing of apps.
If you're using Nanvna-App. right-click in the graph area to open the full
context menu to configure the graph outputs.

Now, play!

On Wednesday, December 15, 2021, 08:43:47 a.m. EST, N5SE
<bwmoore@...> wrote:

Roger Need,

First connected image posted for on-coming Newbies to see what it looks
like. Please reply back via nanovna-users the following info for my guidance
and future newbies.:

1. Do you use FIRST METHOD, SECOND METHOD, or THIRD METHOD to update your
device?
2. What is the latest software update to use?
3. Should I use DfuSe DEMO V3.0.6?
4. What PC programs should I load to start out with?

Thanks in advance
30, Billy

________________________________
From: bwmoore slidesnmoore.com <bwmoore@...>
Sent: Wednesday, December 15, 2021 07:02
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie

Roger Need,

Magic! Absolute Magic! Heinlein would be pleased. Ok, now to read the rest
in detail. May be a while before I post again, need to dig in now.

Thank you so much,
30, Billy



________________________________
From: bwmoore slidesnmoore.com <bwmoore@...>
Sent: Tuesday, December 14, 2021 16:29
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie

Roger,

Downloaded en.stsw-stm32102.zip from:



Unzipped en.stsw-stm32102.zip to six files:
readme.txt
VCP_V1.5.0_Setup_W7_x64_64bits.exe
VCP_V1.5.0_Setup_W7_x86_32bits.exe
VCP_V1.5.0_Setup_W8_x64_64bits.exe
VCP_V1.5.0_Setup_W8_x86_32bits.exe
version.txt

Since I run windows 7 32bit, I installed:

VCP_V1.5.0_Setup_W7_x86_32bits.exe

Went through install procedure Got install confirmation. Plugged in nanovna,
no bing! Turned on nanovna, no bing! No indication at all anything happened!
Go to device manager and find:

STMicroelectronics Virtual COM Port (COM15)

General: Port_#0003.Hub_#0004

Is this what I am looking for. Is everything oi?

Thanks Roger,
30, Billy





________________________________
From: [email protected] <[email protected]> on behalf of Roger
Need via groups.io <sailtamarack@...>
Sent: Monday, December 13, 2021 19:02
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie

Billy,

I understand your frustration so I will help get you started.

The NanoVNA uses 2 drivers to communicate with the PC. One is when you want
to exchange data with a terminal or application program like NanoVNA Saver.
The second is when you want to update the firmware by loading a "DFU" file.

In this post I will only cover the first.

Windows 7 does not have the driver installed for exchanging data so you have
to install it manually. The procedure to download it from ST is cumbersome
and requires registration for some reason. So I have placed it on my Box
clouid drive for you to easily download. Here is the link:



Once you have successfully downloaded it you need to unzip it and install
the driver Win 7. There are 32 bit and 64 bit depending on what type of CPU
you have in your PC. Do not plug in the NanoVNA until after you have
installed the driver. When you plug in the NanoVNA after installation you
will hear Windows "bing" and you will set it in the Device Manager as a COM
port.

Next step is to install NanoVNA Saver. You will find it at this link.



Download the Windows 32 or 64 bit version, unzip and install. Then run it
and patiently wait - it often takes 10 seconds or so to load because it is a
Python program and it unpacking the support routines. Then in the bottom
left hand corner it should show the COM port of the NanoVNA (Rescan if
necessary). Click "Connect to Device" and it should plot in the graphs.

This will get you started. In the Wiki for this group and on Youtube there
are tutorials on how to use NanoVNA Saver.

Roger

Roger
Re: Confused Newbie - Connected

 

Dave,

A click on the URL gives me a really long site titled "Upgrade NanoVNA use DFU
The first link on the page is:



Clicking this link gives me the page you show except the button "Get Software" is missing, Follow any of the links on the page take you to dead end links.

30, Billy


________________________________
From: [email protected] <[email protected]> on behalf of Dave VE3LHO via groups.io <dave@...>
Sent: Thursday, December 16, 2021 10:07
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie - Connected

Billy,

It seems like you are seeing different things than some of the rest of
us. For instance when I click on the first link on the page linked to I
am taken to a web page which has the following:

When I click on the button marked "Get Software" it takes me down the
page where I see another button labelled "Get Latest" which, when
clicked starts on a process which allows downloading the DfuSe Demo
software.

Hardly a dead link. What are you seeing?

Dave

*Re: Confused Newbie - Connected*
From: N5SE
<mailto:bwmoore@...?subject=Re:%20Confused%20Newbie%20-%20Connected>
Date: Thu, 16 Dec 2021 03:14:41 PST

kemon,

Not funny! All the links in this are DEAD LINKS!
30, Billy

[cid:9358d05c-7213-41a2-847a-197ba808c451][Billy Wayne Moore]

________________________________
From: [email protected] <[email protected]> on behalf of
kemon via groups.io <wan3802@...>
Sent: Wednesday, December 15, 2021 21:02
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie - Connected



i learn to flash firmware from this link. maybe it cam help you
Re: Confused Newbie - Connected

 

Billy,

It seems like you are seeing different things than some of the rest of us. For instance when I click on the first link on the page linked to I am taken to a web page which has the following:

When I click on the button marked "Get Software" it takes me down the page where I see another button labelled "Get Latest" which, when clicked starts on a process which allows downloading the DfuSe Demo software.

Hardly a dead link. What are you seeing?

Dave

*Re: Confused Newbie - Connected*
From: N5SE <mailto:bwmoore@...?subject=Re:%20Confused%20Newbie%20-%20Connected>
Date: Thu, 16 Dec 2021 03:14:41 PST

kemon,

Not funny! All the links in this are DEAD LINKS!
30, Billy

[cid:9358d05c-7213-41a2-847a-197ba808c451][Billy Wayne Moore]

________________________________
From: [email protected] <[email protected]> on behalf of kemon via groups.io <wan3802@...>
Sent: Wednesday, December 15, 2021 21:02
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie - Connected



i learn to flash firmware from this link. maybe it cam help you

JwmrfirK98BxihFq.png

Nano VNA SMD test tweeters #adapters #calibration

 

The November/December 2021 issue of QEX has an interesting article on making and calibration SMD test tweeters for use with a Nano VNA starting on page 61. Any ARRL member has free access to QEX as well as QST.
--
73
Bob? KD8CGH
Re: Confused Newbie - Connected

 

Folks,
If you are not familiar with the various types of compressed file formats and you click a download link and see what appears to be garbage appear, look at the first few characters in the top left corner of the browser - you may see "7z" or "PDF" or "MZ" or a number of other characters.


These essentially tell the browser the type of file you want to look at or download.
Unfortunately, sometimes, the browser gets confused and tries to display a file that should be downloaded instead. If you see garbage appear, go back to the previous web-page and right-click that link, then select "Save link as" .
Your browser will save the file and you can then check it out in your downloads folder.

An excellent and free archive utility is called 7zip and can be downloaded from
It handles almost all types of archived file formats, including 7z.

...Larry

On Thursday, December 16, 2021, 06:14:50 a.m. EST, N5SE <bwmoore@...> wrote:

kemon,

Not funny! All the links in this are DEAD LINKS!
30, Billy

[cid:9358d05c-7213-41a2-847a-197ba808c451][Billy Wayne Moore]

________________________________
From: [email protected] <[email protected]> on behalf of kemon via groups.io <wan3802@...>
Sent: Wednesday, December 15, 2021 21:02
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie - Connected



i learn to flash firmware from this link. maybe it cam help you
Re: Confused Newbie - Connected

 

kemon,

Not funny! All the links in this are DEAD LINKS!
30, Billy

[cid:9358d05c-7213-41a2-847a-197ba808c451][Billy Wayne Moore]

________________________________
From: [email protected] <[email protected]> on behalf of kemon via groups.io <wan3802@...>
Sent: Wednesday, December 15, 2021 21:02
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie - Connected



i learn to flash firmware from this link. maybe it cam help you

Outlook-bbglsip5.gif
Outlook-Billy Wayn.gif

Re: Confused Newbie - Connected

 



i learn to flash firmware from this link. maybe it cam help you
Re: Confused Newbie - Connected

 

Actually, if you want a good list of Nanovna applications, just use the forum wiki.?
What Google and Bing are showing is the info on Hugen's website, nanovna.com.?
The link with the garbage should actually be saved to your PC by right clicking it and using the save.link.as command as it is a 7z type file (compressed).?
If folks don't want to use the Nanovna forum wiki for info about the Nanovna family then they may be disappointed with they find elsewhere. Just say'n.?


On Wed., 15 Dec. 2021 at 6:38 p.m., Ken<ko6no@...> wrote: Billy is right about one thing. The Page that Bing (or Google) brings up about NanoVNA-App does have a link for downloading the program ("You can download the pre-compiled software here.")? which leads to a page full of hieroglyphic text, Must be a busted link. I hope the author is reading this forum and will fix it.
Re: Confused Newbie - Connected

billsf9c
 

Of course, each person learns differently and sometimes, I'm too close to the forest to see the trees...
Stepping in, this is presently over my head. I once taught computer parts selection, and other electronics. I don't know more than basics, an huge amounts if innuendo, but I could put them together, and explain them.

I barely know smith charts. But Billy, you have a huge opportunity.

I have, in any part if my electronics professions, advised a primer and a reference book, but by different authors and dif publishers.
You can save, sort, and collate this... to bridge between what places the absolute newbie from the semi-veteran.

And make it a File.

NEW blood in an organisation is a huuuge benefit, while it is fresh; untainted. It sees the blind spots That's about 3 months. Use them. I will need them. So will others.

BillSF9c
Re: Measuring the output impedance of a 20m push-pull power pre-amp #transformer

 

But, I think Manfred has hit the nail on the head. This amplifier simply
isn't giving me the output power I expected and I've read all the passages
from EMRFD and multiple other sources on how things are "supposed" to go. I
understand the first few paragraphs of Manfred's response and this is
certainly the approach I took at the start. However, when I tried impedance
matching the collectors to the 200 ohms or so required to output 1 watt, I got
an output that fell disappointingly short of that. Since then I've been in
experimental mode, swapping transistors (I had tried BD139s, two in parallel
for 4 in total), introducing and reducing feedback and changing the winding
ratios of the transformers.
Seeing your photos, several things jump up that could be involved:

- Those SLKOR transistors. Are you sure that they really meet their specs? SLKOR is a Chinese brand. I have never used any of their parts, so I don't know whether they are good. But generally my experience with Chinese copies of Japanese transistors is very, very poor. I have yet to find one that performs as well as an original.

Replacing those by BD139 obviously isn't a good idea either. Those are low frequency transistors. Even if you get originals rather than Chinese fakes, they will perform poorly at RF.

The sad fact is that production of bipolar RF power transistors pretty much stopped, several years ago. If you can't find NOS transistors, you should better stick to MOSFETs, which are in full production right now, by reputable companies. For small amplifiers, transistors like the RD06HHF1 and RD16HHF1 are inexpensive and reasonably effective choices. Or go the whole way and use LDMOSFETs, which have much better performance.

- Your output transformer: Far too few turns, giving enough inductance only on the highest bands, and with far separated windings, causing a leakage inductance that might be acceptable only on the lowest bands. In other words, there is no band on which that transformer works well!

- Your layout: As long as you keep to the 1W level, you can indeed get away with such long connections. But when you try to get more power, and the impedances fall accordingly, you really need to shorten the critical connections almost to zero length. Any conductor is an inductor at RF. Adding all those little series inductors can really wreck a low impedance RF circuit. As a very crude reference value, each millimeter of conductor adds one nanohenry of inductance. The actual amount will change a little from that according to conductor diameter or width, and some other factors.

Beyond that, output power is mostly a matter of what you design for. You wrote that you wanted 1W, so I showed you calculations for that power level. If you want higher power, simply re-do the calculations according to the power level desired. The collector load resistance will be a lot lower, making stray and leakage inductances more critical, and stray capacitances less critical.

You should use RF transistors at their design power level. If you use them at much lower level, their high capacitances will cause trouble. So, design the circuit for the power you want, and then select transistors that fit the application, without too much headroom. Collector load resistance is not a function of the transistor used, but of output power and supply voltage. The transistor just adds various amounts of capacitance and inductance, and if this is a lot, it has to be tuned out. This tuning is then a function of the transistor used, but not the basic transformer ratio calculation.

Of course, when you run a transistor at higher power, you also need more drive. But when you are using negative feedback, the amount of additional drive required can be quite small, since the feedback circuit is swamping the transistor's base input impedance.


@Manfred I understand your point about the low-pass effect of the transistor
capacitance, but what I don't understand is how other experimenters seem to
generate much more power from similar circuits (like this one:
)?? I just get the sneaky
feeling that I'm doing something incorrectly and my suspicions are converging
on the output transformer.
It's just a matter of doing a correct design, step by step. When you design a power amplifer, you work backwards, from the output to the input. You first calculate the transformer ratio needed for the desired power and supply voltage, then you select suitable transistors, then you design a feedback network that will stabilize the gain over the bandwidth, and suppress distortion, to the desired degree, then you calculate the input transformer ratio to match to the resulting total input impedance. Finally you add biasing. Then you see whether the drive power you have is enough, and if not, you design a driver stage, in the same sequence.

You need to select or make every component to meet the required specs. The output transformer is a critical element, but the most critical of all in a true class AB pushpull amplifier is getting excellent coupling (in opposite phase, of course) between the two collectors. This can be done with a bifiliar feed choke, or a center-tapped transformer, but it needs to be well done, and it gets mighty hard even at medium impedances, and essentially impossible at very low impedances. That's the root cause of poor efficiency and high distortion in most solid state power amplifiers, by the way! The bypassing of the feedpoint needs to be absolutely excellent too.

At 100? or 50? it's easy. At 10? it's hard. At 2? it's impossible. Unless anybody here can teach me how to do it.

Just a couple of additional notes: the collector base feedback network was
something I'd planned into my PCB, but hadn't used until I started playing
with the 2SC2078's. Without that network, the circuit oscillates like crazy.
I've been pushing up the value of the feedback resistor (thereby reducing the
feedback), but I'm going to suggest that even if that feedback wasn't there,
it still wouldn't produce the output power it should.
You should always include that feedback. It helps in many ways: Stability against oscillation, it levels the gain over the frequency range, it reduces distortion, it makes the circuit less sensitive to transistor characteristics. But it does cost some power and efficiency, and increases drive requirements. Nothing is free in this live.

You should also improve that layout. The emitter leads of those transistors should be very very very short. If you use those RC combinations in the emitter leads, for bias stabilization, then this ver very very short length must include the capacitors, making SMD capacitors almost mandatory. There should be a ground plane to which these short emitter leads connect. The feedpoint bypassing should connect to that groundplane very close to the emitter leads. Looking at your photos, I would estimate that you have roughly 30-40nH in series with each emitter lead, and that's a problem even at the 1W level! And I haven't seen the copper pattern of your board. I hope you are using a groundplane, not just narrow tracks!

The output transformer windings fall far short of Manfred's (and others!)
suggested rule regarding inductance > 5-10 times load at lowest freq. The
thing is, I've tried quite a few winding ratios and turns at this stage and
the current ratio seems to give the best output. I find this very strange,
but there you go. I'll try upping the turns later, just to double check that.
I suspect that what's happening is that you are resonating the transistors' capacitances with the inductance of that transformer. That's OK, but only on a single band! Did you try on several bands?

Also using so few turns will cause a high flux density in the core. This causes high loss. Let's put numbers to it: You have 4 turns, and about 15V RMS across them. What band are you trying? I will assume 3.6MHz. The flux density will be close to 10mT, and the loss is then over 600mW per cm?! Since your core has a volume of about 1.3cm?, that's about 800mW core loss! Pretty high for a 1W amplifier...

Using the correct number of turns will fix that. But the leakage inductance will get worse. So you need to use a construction style that minimizes leakage. I would suggest to twist 3 wires together, wind 6 turns of that bundle, and connect it for 12 primary and 6 secondary turns. You also get a center tap as a free gift in that bargain.

That's for 1W, of course, and assuming transistors suitable for 1W. The ones you you are uising probably aren't.

If you can find another core, that has a similar cross sectional area but much shorter path length, and thus less ferrite to heath, that would improve matters too. The higher inductance per turn of that core might enable you to use only 5 trifiliar turns instead of 6, further reducing leakage.

Have a look at my 50W amplifier, to get some ideas:



About measuring leakage inductance: First build yourself some simple test jig for the nanoVNA. Simplest is something that allows clipping or clamping the part under test to the CH0 port, using the shortest leads possible. Calibrate it from 1 to 100MHz or so. Then connect one side of your transformer to it, measure the inductance, and check against calculations to make sure your setup is working right. The inductance should measure pretty much as calculated at the low end of the frequency range, and fall to a much lower value than calculated at the high end, while the resistance rises.
Then short the other winding. Make the short as short and good as you can. The inductance measured for the first winding will fall dramatically. The inductance value you read now is the total leakage inductance of the transformer, as seen from the winding you connected to the nanaoVNA. Depending on which winding you connect, you will get different values, and they should have a ratio between them that matches the impedance ratio (square of turns number).

If you are measuring from the 50? side of the transformer, look at which frequency the leakage inductance has a reactance of about 20?. This is roughly the frequency where the transformer will start causing an obviously noticeable power drop. Then look at which frequency the inductive reactance reaches 50?. This is the highest frequency to which the transformer can be used by adding suitable compensation capacitors.

Manfred
Re: Confused Newbie - Connected

 

Billy is right about one thing. The Page that Bing (or Google) brings up about NanoVNA-App does have a link for downloading the program ("You can download the pre-compiled software here.") which leads to a page full of hieroglyphic text, Must be a busted link. I hope the author is reading this forum and will fix it.
Re: NanoVNA-H4 Case

 

I'd like to thank you, also. I just ordered one. Looks like just what I want.
Re: NanoVNA and PC. ?SOLVED!!!

 

Many thanks DiSlord.

The firmware is so complete that I had only tried it in the most basic. I had not seen what you tell me. Sorry.
I return to the comma in Windows and also change in the firmware. Congratulations for the new Version 1.1, thanks.
Very thankful
Antonio - EA7HJ
#general SD cards #general

 

I've reduced the size of the micro SD card to 32GB and formatted it to FAT32 but my H4 still won't write to it. I've made sure the car was plugged in properly and tried a second card but still no joy? FW=1.0.70. The H4 seems to be working fine, measuring, displaying and playing nicely with NanoSaver, etc.
Rudy N6LF
Re: Confused Newbie - Connected

 

Roger,
Thanks a bunch. Will Do.
30, Billy

________________________________
From: [email protected] <[email protected]> on behalf of Roger Need via groups.io <sailtamarack@...>
Sent: Wednesday, December 15, 2021 11:43
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Confused Newbie - Connected

Some people like to learn by reading manuals and tutorial guides. Others prefer videos in order to learn how to use a NanoVNA. Many of the YouTube videos are poorly done and contain technical errors. You have to search for the gems.

However those done by W2AEW are consistently excellent and I have learned a lot by watching them. He covers many technical and ham radio topics but has quite a few on the NanoVNA. The videos are easy to watch, well edited and have clear, technically accurate content.

Here is a link to the site:

New VNA Users should start with #312 - What is a VNA. Then proceed to #313 on NanoVNA calibration and #314 on antenna measurements. The other videos cover NanoVNA topics like measuring crystal filters and filters, determine coax parameters and other interesting topics.

Roger
Re: Confused Newbie - Connected

 

Some people like to learn by reading manuals and tutorial guides. Others prefer videos in order to learn how to use a NanoVNA. Many of the YouTube videos are poorly done and contain technical errors. You have to search for the gems.

However those done by W2AEW are consistently excellent and I have learned a lot by watching them. He covers many technical and ham radio topics but has quite a few on the NanoVNA. The videos are easy to watch, well edited and have clear, technically accurate content.

Here is a link to the site:

New VNA Users should start with #312 - What is a VNA. Then proceed to #313 on NanoVNA calibration and #314 on antenna measurements. The other videos cover NanoVNA topics like measuring crystal filters and filters, determine coax parameters and other interesting topics.

Roger
Re: Confused Newbie - Connected

 

Billy,

I suggest you learn to use what you presently have working before you start upgrading firmware and using different apps.

Some new users have problems (getting driver installed, understanding firmware update SW etc.) upgrading their NanoVNA. What you have now is probably all you will ever need and it works so just get comfortable with it and learn how to use all the features of your NanoVNA.

NanoVNA Saver will do most functions easily and many users just use this app and don't bother with others.

Many questions that you have can be found by reading the Absolute Beginners Guide v1.6

/g/nanovna-users/files/Absolute%20Beginner%20Guide%20to%20The%20NanoVNA/Absolute_Beginner_Guide_NanoVNA_v1_6.pdf

Here are some links on how to use NanoVNA Saver





I hope this helps. You should have enough reading material to get you on your way.

Roger



The group Wiki has an index and clickable links to common topics. Look there first and you will find most of your questions answered.

/g/nanovna-users/wiki
Re: Confused Newbie - Connected

 

sorry for the fumble fingers.. should read:


However, the link seems broken. If you right click on the "here" link you can copy the link address and paste it into a new browser tab and download the file.
Re: Confused Newbie - Connected

 

Billy,

This is the correct URL:


However, the link seems broken. If you right click on the " here" link you can copy the link address and past it into a new browser tab and doenload the file.

73,
Geoff-AB6BT
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