开云体育

hwalker wrote:
The Jan-Feb 2020 Issue of the ARRL QEX magazine has a cover story on the NanoVNA by Dr. George Steber:

"Dr. George R. Steber, WB9LVI, reviews a tiny vector network analyzer (VNA) introduced for about US$50 and compares its capabilities with full-featured lab grade analyzers that cost thousands of dollars. An RF VNA is the instrument of choice for measuring the electrical parameters of antennas, components, filters and more. Dr. Steber describes his experiences with the tiny VNA, termed a NanoVNA. He begins with a short description of some technical specifications, and relates how he acquired the NanoVNA. He then includes historical details on the evolution of the product. Next, he describes the general architecture of the instrument, and finally he describes the operation of the unit and including examples."

===============================================================================================

My original intention in starting this topic was to let our users know about the QEX NanoVNA article and to acknowledge one of my favorite technical authors. The original post does not, as stated by at least one responder, in any way, shape, or form advocate copyright infringement.

Dr. Steber usually gives a down to earth technical description of a device's inner workings before preceding on to numerous practical use applications. Those expecting some type of a-b comparison with high end commercial VNA's are likely to be disappointed.

I guess the second reason for starting the topic was to acknowledge the NanoVNA's semi-Rockstar status as the cover boy for QEX magazine :)

Happy holidays,

- Herb

Thank you all for the nice info. The puzzle is much closer to completion.
In the mean time I have received the bridge, made first measurements. So far I can see that |S21| using the bridge agree very well with |S11| when connecting the DUT to CH0, which was expected. At least I can calculate the magnitude of DUT's impedance, knowing RL.

I've asked Rune, the author of the wonderful piece of software NanoVNA-saver to add external bridge support, as suggested by Erik (thank you both).


73 Ady YO2NAA

On Wed, Dec 18, 2019 at 03:24 PM, Christoph Schw?rzler wrote:

I don't see any possibility to suppress charging when using NanoVNA Saver
anyway, besides removing the LiPo if this is the problem. Is there any?

Then connect usb and wait until battery will be charged to 100 % and charge led stops blinking. After that you can start measurement. The effect will be significantly reduced.

On Mon, Dec 23, 2019 at 08:44 AM, Oristo wrote:

Give it a rest

==========================================================

Oristo, I second your thoughts. My two favorite quotes regarding this are:

"There is nothing new under the sun." and "We all stand on the shoulders of giants."

There is a difference between plagiarism and writing the same thing in your own words. Edy555, the original NanoVNA developer, acknowledged that hugen's effort went over and above his own in pcb layout, battery management, frequency range extension and pc software. Edy555 has only requested that hugen change the name of his retail product to "NanoVNA-H" to distinguish it from Edy555's limited production run kit. Edy555 own development effort was based on the popular DIY DG8SAQ VNWA.

Edy555, hugen, and Gabriel are all true innovators in their own fashion. They have contributed and continue to contribute to the development of the concept of the NanoVNA, Other manufacturers (NanoVNA-F being the exception) have blindly reverse engineered the PCB design of hugen and have not added any other intellectual contribution. They are the ones the word "cloner" should be reserved for. Without the continued contributions of edy555, hugen, Gabriel and those of some highly talented members (both programmer's and documentation writers) of this group, the NanoVNA would not be enjoying its current widespread popularity.

Happy Holidays,

- Herb

I could write an article comparing between the NANOVNA and the HP 8753C
with associated S-Parameter Test Set both of which I have. But, I'm not so
inclined as I've satisfied myself that the two, over their respective
measurement ranges, compare extremely well within measurement error
(operator rigorousness). So, that having been written, be rest assured
anything I've measured between the two instruments compares extremely
favorably. But, don't expect $40k performance out of a $50 instrument.
The noise floor is the big difference. But, do amateurs really need 100+
dB dynamic range to 6 GHz?. What the NANOVNA offers in that respect is far
more than adequate for amateur purposes. As a matter of fact, its far more
than needed to do all the amateur measurements required, with the possible
exception of tuning a set of BPBR cans. Other than that, its amazing what
the designers have embodied in a $50+ piece of gear! It's no toy!!!! It
offers performance far beyond anything the amateur can afford, well into
and above $1K range. It's WAY BEYOND a toy and truly does compare
favorably to the 8753C. It's an outstanding piece of test equipment which
the average amateur should learn to use and appreciate.

Suppose I am late to get on the bus. However, I've been reading as this
developed and made a choice not to jump in. I took the belly aching as due
to not being able to (legally) distribute the QEX article to this group and
beyond. Anyone could scan it in and (illegally) distribute it. Well,
today, I jumped in. As I pointed out in my last email, there are many
other free sources available with only a www search than the single article
published (under copyright) in QEX. Not defending copyrights or what ever,
but the capability of the NANOVNA.

Dave - W?LEV
.

On Mon, Dec 23, 2019 at 2:39 AM stone_ridge_road <xdavid@...>
wrote:

Not all. I just think it's funny how easily people will rationalize
their behavior, and I'm referring to the guy who started this thread as
well as the guy who thinks W0RW isn't engaging in copyright abuse.
Some of the other comments on free use have been informative for me, but
I still think it's telling that nobody has thought to simply ask the
author of the article for a free summary of his conclusions.

I don't know what links you referring to either .... I don't believe
I've posted any relative to this thread.

73,
Dave AB7E



On 12/22/2019 6:00 PM, Frank Howell wrote:

Wow, Dave! You got in the bus very late, didn’t you?

NONE of us are interested in this new QEX article for VNA theory! It’s

about the empirical comparison of the NanoVNA versus other higher grade
VNAs. Do you get that difference? I’ve got about a GB of books and articles
(including the ones you’ve put links to instead of actually reading this
thread) on VNA theory, tutorials, user & service manuals, etc.

Way back on Saturday Night Live, Emily Litella used to get in the bus

late, too. But when she caught on, she exclaimed, Never mind!

What’s in your wallet? Lol

--

*Dave - W?LEV*
*Just Let Darwin Work*
*Just Think*

Nice job Luc. An english version will be very nice.
Kleibe PP2KR

Good luck Arie, veel succes !

Feel free to use anything you think is useful.
You can always distribute my presentation as "extra" reading material.

And oops, I forgot to mention in my first post that if anyone thinks I violated their copyright ... pse contact me off list to set things straight ;-)

73,
Luc ON7DQ

Amazon has updated the various Fire tablets a number of times over the
years. Many of their devices, even including ones that were being sold
earlier in 2019, are stuck on Fire OS 5, which is derived from Android 5.1
Lollipop. Those include the Fire HD 8 through the 2017 model (replaced in
2018) and the Fire HD 10 through the 2017 model (replaced in 2019).

Some other models run Fire OS 6, based on Android 7 Nougat. They include
the 2018 version of the Fire HD 10 and the 2019 version of the Fire 7.

The newest version of Fire OS is 7, based on Android 9 Pie. The only model
to date that runs that version is the 2019 version of the Fire HD 10.

Amazon doesn't do major version upgrades of Fire OS on their existing
devices, despite the minimal hardware differences between them. (It
probably means that they don't want to bother to implement clean upgrades
that preserve all user data.) That means that the older ones get stuck on
earlier versions of the Android SDK and won't run some newer apps.

On Mon, Dec 23, 2019 at 11:04 AM Lawrence Macionski via Groups.Io
<am_fm_radio@...> wrote:

hwalker- L.Rothman-

A couple of weeks after I bought the FIRE as it's only 4 months old
yesterday. Amazon sent me a "Special Offer" to trade in my FIRE for the
"Latest". I felt it was a "Bulk email" to all FIRE Owners on their list,
which it was, but they never indicated #1 there was a problem #2 the
problem will continue as new apps are released that take advantage of later
versions of Android 5.. which was obsolete that day I bought it..I'm not
sure but They were haaving a "PRIME DAY" and suckered me like they did Joe
and Sally Sixpack.. What pisses me off more I gave away my 7 inch quad core
Samsung to a deserving young lady who lost a baby to SIDS. She was here
last weekend housecleaning for some Christmas money. I should trade back
for the FIRE.. And I bought the fire with 64Gb RAM not 32.... Anyhow... 2
options - Amazon offers 7.3.1.1 as a download .bin file... Yet no
instructions. How woul done install it and would it work, or did they
change hardware. Both are Octo-cores..

I saw this too.. Has anyone tried it... the claims seem to indicate an
advantage to where I am at with regard to being "Throttled" by Amazon. BUT-
it does not change the level of my OS... My point being even if I
"UN-Throttle" Amazon will the NovaVNA app run on OS based on Android 5...
Here is the link:




Merry Christmas to all, I'm leaving for the Airport, I'm schelping the
family too cheap to hire an UBER driver today..relatives coming to town,
bearing critizims and opinions galore..Tiz the season... reminder to
self--Stop at Liquor store. The 3 beers I put in the Fridge after Field
Days are hanging on the tree empty as of last night.....

Stealing intellectual property

Give it a rest

Read my note on purchasing Chromebooks. They actually come with an 'expiry date' after which Google will no longer offer any type of updates. A number of forum members have installed Linux on their older Chromebooks due to this 'Feature'.?
/g/nanovna-users/message/7894
Looks like Amazon is learning from Google

Thanks for the feedback and link Ady.

Once the cal is complete, the measurement plane is 50 ohms. Assume the cal is accurate and complete, the fixture will actually be a larger error contributor than the vna itself. It cannot be over emphasized that these large chokes must be measured in-situation as they are used. The parasitic present will be altered dependent on their placement.

I had this vna running for some other work and took a look at one of these larger unmodified plate chokes. The first clockwise crossing is the standard SRF of the parallel resonate point. Sorry for the blur photo but you can see the 2- series resonance loops, one at ~ 15 MHz, the larger, and a second smaller one at 21 MHz. This second small loop is problematic. This measurement is taken with 401 date points.

Use of the vna will require more than 101 data points to properly resolve the loops. Use of the feature in PC saver routine is required. Cal over several 100 points is necessary to achieve the loop signature clearly.

Alan

It would not. GPL:ed software does not care about the license of the hardware it runs on.
If it did, Dell and Lenovo would have to release the schematics and board files of their offerings running Linux out of the box :)

Edy555 also released the schematics under a permissive license, but the pcb artwork was not released. Hugens NanoVNA-G is their original pcb artwork, even if it is firmware compatible with the original NanoVNA.
Similarily thus NanoVNA 3ghz/SAA/v2 is original artwork.
Only thing in common with other NanoVNA's is the name and firmware compability.

hwalker- L.Rothman-

A couple of weeks after I bought the FIRE as it's only 4 months old yesterday. Amazon sent me a "Special Offer" to trade in my FIRE for the "Latest". I felt it was a "Bulk email" to all FIRE Owners on their list, which it was, but they never indicated #1 there was a problem #2 the problem will continue as new apps are released that take advantage of later versions of Android 5.. which was obsolete that day I bought it..I'm not sure but They were haaving a "PRIME DAY" and suckered me like they did Joe and Sally Sixpack.. What pisses me off more I gave away my 7 inch quad core Samsung to a deserving young lady who lost a baby to SIDS. She was here last weekend housecleaning for some Christmas money. I should trade back for the FIRE.. And I bought the fire with 64Gb RAM not 32.... Anyhow... 2 options - Amazon offers 7.3.1.1 as a download .bin file... Yet no instructions. How woul done install it and would it work, or did they change hardware. Both are Octo-cores..

I saw this too.. Has anyone tried it... the claims seem to indicate an advantage to where I am at with regard to being "Throttled" by Amazon. BUT- it does not change the level of my OS... My point being even if I "UN-Throttle" Amazon will the NovaVNA app run on OS based on Android 5... Here is the link:



Merry Christmas to all, I'm leaving for the Airport, I'm schelping the family too cheap to hire an UBER driver today..relatives coming to town, bearing critizims and opinions galore..Tiz the season... reminder to self--Stop at Liquor store. The 3 beers I put in the Fridge after Field Days are hanging on the tree empty as of last night.....

Hello Gunthard,
Thank You very much for your wonderful web site
with so many GREAT tutorials !

NE7LS

On Sun, Dec 22, 2019 at 10:54 PM Gunthard Kraus <mail@...>
wrote:

Hello Friends,
I have my tutorial extended by a chapter "The NanoVNA-H used up to 1500
(1300) MHz" and uploaded to my Homepage ( www.gunthard-kraus.de) as
Version 1.5.
The chapter contains also a 110 MHz LPF tested up to 1300 MHz as a
practical example.

Have fun with it.

73's

Gunthard , DG8GB

--




n_n

ann : next-to-come : on the comparison of our picture with that by Erik, PD0EK

#90.04: Another one Estimated Value of Core Uncertainty in Z Measurement
-
Continuing our guesses regarding the references of Gary O'Neil, N3GO
:
23 December 2019 - /g/nanovna-users/message/8585
:
... but, on the other hand, if you ask if we can replace the legitimate - by
the Decent Manufacturer of the Standards - S, L, O values, we chosen in
our other program:


#90: On the -Second- Arithmetical Method of Error Estimations in VNA
Measurements - 22 December 2019 - /g/nanovna-users/message/8505

e.g. by the uncertainty values:

S: 0.99*(cos(pi*(+178/180))+%i*(sin(pi*(+178/180))))$
L: -0.029*(cos(pi*0/180)+%i*(sin(pi*0/180)))$
O: 0.99*(cos(pi*(-2/180))+%i*(sin(pi*(-2/180))))$

which result to be the conjugates of the previous ones, then the answer is positive,
simply because these values are also legitimated by the Decent Manufacturer of the
Standards - they are within the uncertainty limit he provided to The Common User.

By the way, the Core Uncertainty which is propagated from the Standards to Z, and
was estimated in:

#90.01 : Final Conclusion
22 December 2019 - /g/nanovna-users/message/8521

having its part values:

( Rt : +5% , Xt : +13% )

now, after the above replacement, results to also has the part values:

( Rt : - 5% , Xt : - 19% )

and so on...

Sincerely,

gin&pez@arg

On the software side, Edy555 released his software under the GPL licence.

Would that put the hardware under such licence? I am not sure.

But Gabriel is telling us that the new product have nothing to do with
the hardware version of Edy555.

@Gary, N3GO
22 December 2019 - /g/nanovna-users/message/8572

Dear Gary,

Well, these are interesting issues indeed, but we are not sure exactly where we have
to look at, so we can only guess, e.g. if you are referenced at our positive conclusion:
#89: On the Comparison of our Formulation with that by Erik, PD0EK" - 22 December
2019 - /g/nanovna-users/message/8494 , then you may have to take
into account that our positive result : "true" is made possible only after we included
in our program all the needed corrections to Erik's program - as we suggested with:
@Erik, PD0EK - 21 December 2019 - /g/nanovna-users/message/8482

So, would you, please, be more specific regarding to what you are referenced at ?

Best regards,

gin&pez@arg

On Mon, 23 Dec 2019 14:20:10 +0100, you wrote:

Hi Andy,
Thanks for your comments! I'm not entirely sure what the NanoVNA returns
via the serial port when changed to TDR mode - but since NanoVNA-Saver does
have its own TDR function built in, I think it's more useful to just work
on that instead. :-)

I tried to use the TDR on the Saver program,
but it shows cable lenghts from 8 meters to 4 kilometers,
depending on what I dunno.

I have not yet found a procedure how to do TDR.

w.

Hi Andy,
Thanks for your comments! I'm not entirely sure what the NanoVNA returns
via the serial port when changed to TDR mode - but since NanoVNA-Saver does
have its own TDR function built in, I think it's more useful to just work
on that instead. :-)

--
Rune / 5Q5R