开云体育

I agree with you Dave; sometimes it is like "drinking from a fire hose". This is an extraordinarily?active site; it is difficult to try to read the messages that interest me.?I don't know what the answer is. I have thought of getting another email address especially for this group.
Stuart K6YAZLos Angeles, USA

On Sun, 29 Sep 2019 at 21:39, Warren Allgyer <allgyer@...> wrote:

Dr. Dave

I already noted that you cannot see the -60 dB point on a filter in
through mode with a dynamic range of 40 dB. And I already noted that 99% of
the time I personally do not need to see the 60 dB point and that for the
1% I can add an amp to the source.

I am sorry I didn’t read further down your post.

And I am glad you have such equipment because between talking about that

and your self promotion there is very little meat left in your posts.

Given how you feel about me and my posts, why not just send my messages to
Bin/Trash/Spam or similar in your email client?

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

OK... this probably is not so much a problem with NanoVNA-Saver, per se, but I'm hoping someone can point out what may be wrong. I have a laptop that I normally boot Windows 10, from which I run NanoVNA-Saver from with no issues. Lately, I've created an Ubuntu 19.04 Live USB with persistent memory, as I don't want to create a partition on my laptop. I have installed python with all the required modules, including "pyqt5", but when I attempt to start the program, I get the following error:


Traceback (most recent call last):
File "nanovna-saver.py", line 17, in <module>
from NanoVNASaver.__main__ import main
File "/home/ubuntu/Git/nanovna-saver/NanoVNASaver/__main__.py", line 21, in <module>
from PyQt5 import QtWidgets, QtCore
ImportError: No module named PyQt5


If I type in "pip3 install pyqt5", I get:

Requirement already satisfied: pyqt5 in /usr/lib/python3/dist-packages (5.12.1)

So, it is already installed... I'm puzzled... Any ideas?

It's great now.? Don't screw it up.
Mike WY6K


"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."

if you prefer the extremely detailed information (the kind written by committee and likely to make your eyes water) :-P

I am on about a dozen different groups for various things

* Website design
* Graphics
* Keysight groups for VNAs
* Keysight group for LCR meters
* A couple of UK based amateur radio sites
* GNU cash
* SageMATH mathematics software
* UK microwaves
* HP/Agilent/Keysight (I am owner)
* VNWA

There’s more messages from this group than any other - and possibly all the
others combined. ????

I am not sure if that’s a good thing or not. If the popularity of the list
grows much more, I will probably have to start muting topics.

Maybe if the popularity grows much more, the group owners might want to
consider splitting the group, another group, hashtags, subgroups or
anything else that is needed to keep the volume of emails to an acceptable
level.


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

See post #3 2984 from YZA for links to the aforementioned pdf’s. No epiphany here yet though.


--
73

Gary, N3GO

Special Provision 188
Cells and batteries offered for carriage are not subject to other provisions of ADR if they meet the following:
(a) For a lithium metal or lithium alloy cell, the lithium content is not more than 1 g, and for a lithium ion cell, the Watt-hour rating is not more than 20 Wh;
(b) For a lithium metal or lithium alloy battery the aggregate lithium content is not more than 2 g, and for a lithium ion battery, the Watt-hour rating is not more than 100 Wh. Lithium ion batteries subject to this provision shall be marked with the Watt-hour rating on the outside case, except those manufactured before 1 January 2009;

If you’re willing to dredge through the math, they have posted links to a part series dating from 2007 or thereabouts, that looks to have roots in Nikolitsa Yannopoulou’s doctoral thesis (yin of yin & pez). She was a grad student of Dr. Petros Zimourtopoulos who was the leader of an Antenna research group he founded in 1985 as an assistant EE professor at Democritus Univ. at the time. My guess is that she has remained working with him as a post grad student, or perhaps now as his assistant. I haven’t researched them to that detail.

The 5 papers were published in a metrology publication called Telecommunications Engineering, and in another publication called RADIOENGINEERING.

All are in English and in PDF form, and all are quite readable. They are heavily mathematically detailed, and Eric’s observations align with my own. They appear to have done limited testing of their math model using a UHF ground plane in an anechoic chamber positioned in a manner that deliberate distorts its impedance profile, and a DIY test load comprised of a parallel pair of resistors in a closed housing. I suspect this too was done with the intent of creating a sub-optimal impedance profile. I believe this is the extent of real data that they have experimented with, but I’m still quite confused with what they are looking for from us.

The quality and readability of their technical papers is quite excellent, and that encourages me that much of the frustration we are experiencing is due to using a poor quality translation engine.

The papers are lengthy, and mathematically intense, but not overly difficult to read and comprehend by those skilled in differential calculus. However; the context surrounding the math may be sufficient to glean some idea of how they have spent their careers, what’s behind the software which I believe they confirmed and agreed is now quite dated and due for overhaul. One can gain a degree of insight by a careful read of the textual content in concert with the graphics that are the output byproduct of their software.

I haven’t used Fortran since my college days, and there are few that I know who are or have since C began gaining favor. Most have moved beyond C++ since those days.

I believe there would be far fewer radio amateurs if they were required to have the advanced mathematical knowledge to easily comprehend this work however. Again; I believe their comments in that regard became greatly distorted in the translation.

--
73

Gary, N3GO

On Sun, 29 Sep 2019 at 23:39, Jeff Anderson <jca1955@...> wrote:

Hi Rune,

Here are a few links regarding s1p/s2p file format.

From Keysight (more of an outline):




Dr. Kirby's Website:


Z and RI format. (image attached)

And Dr. Kirby's examples are in MHZ, and DB format (magnitude in dB,
Angle) (see his website)

Also, if loading s2p files, be aware that they will most likely contain
S22 and S12 data, in addition to S12 and S11 data, so if you were to
support the reading of third-party s2p files (such as the ones I've just
described), the software should recognize (i.e. not crash) when these extra
fields are present.

I don’t know how Rune would do it, but when writing .s2p files without all
4 S-parameters, I set the magnitude to -200 dB for anything not measured.
Then it can be read into ofter software, like simulation software, and the
results be meaningful.

I once wrote a Touchstone file from my LCR meter, but used the impedance
format, rather than the S-parameter format. I tried reading that into the
VNWA, but that could not handle it. Nor can the Agilent PNA-X.

The only free program that could read my file was Sonnet Lite. I don’t know
if that fully supports the Touchstone file format, but it was better than
anything else I tried. I think ADS could read it too, but ADS is lots of
??????.

So if you want to play around with Touchstone files, I would give that a
try.

Anyway, nice features to have, if you can ever find the time!

Best regards,

- Jeff, k6jca

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

No, you would input the signal into CH1.

no relations with the seller, caveat emptor, warning, batteries not
included, groove is in the heart, etc...
---8<---Corte aqui---8<---


---8<---Corte aqui---8<---


Em dom, 29 de set de 2019 às 21:11, Don via Groups.Io <donald_s_58103=
[email protected]> escreveu:

More than likely it is a scam. I got taken by a similar scam just a couple of weeks ago. Ordered one from a seller in China for $19.99. He had a 99% positive feedback and was rated a top seller by ebay. Unfortunately, I think he built up his feedback on sales of low-value items and once he had established a reputation as a "reliable" seller, he started selling items in the 30-50 dollar range and of course, did not deliver. Ebay refunded me and his 99% feedback soon dropped to 49.5% (a score of -4).

For those of you who are thinking of using an Android based device that has a built-in USB OTG interface to try and program the NanoVNA, below is a GitHub user who developed a DfuSe programming android app.
It's located in the release section and you need to sideload it.

Make sure to read the Readme for info on how to create the dfu file.



Regards
Larry

On Sun, 29 Sep 2019 at 20:00, hwalker <herbwalker2476@...> wrote:

Gabriel,
Hugen posted last night that a 3.5" display could still be part of the
final design. The NanoVNA has been really well received but one of the
most requested feature updates has been a larger display. The 4.3"
NanoVNA-F is selling at a price point about twice the NanoVNA primarily on
the basis of its larger display. If your cost point cannot be changed to
incorporate a larger display, then hopefully the STM32F303CCT6 will have
enough space for both Chinese characters and large English font to make the
display more readable.

Something else I notice is that the 4.3” screen NanoVNA-F has a 5 Ah
battery and a metal case.



They quote the current consumption as 200 mA, and a theoretical 18 hour
life. I am not quite sure how that’s worked out

5000/200 = 25 hours.

My usual reservations about cheap batteries apply, but a 5 A hr battery
from a reputable manufacturer is going to costs a fair bit. I was looking
at 3.2 A hr for about ?20, so 5 A hr would be more.

I will probably buy a NanoVNA-F, but until such time as I have mine boxed
up properly, I am going to wait to place an order, as prices keep falling.
By the time I am ready to buy, maybe an even bigger screen will be
available.

I paid quite a bit (?1250) for this iPhone XS max on the basis of it’s 6.5”
screen, so I don’t mind paying a fair bit more for a NanoVNA if the screen
was bigger.

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

On Sun, Sep 29, 2019 at 03:40 PM, Jeff Anderson wrote:

So, for me (and my Matlab-generated files), it would be great if you also
supported loading and storing files using MHZ in lieu of HZ..

NanoVNA-Saver can already read and save in RI format (I believe). If you were
to add the reading of files in DB or MA formats, this would require
mathematical conversions. Not difficult, but more code.

Just in case my comment is misinterpreted -- I didn't mean to sound like I was only pitching adding MHZ and nothing else. I'd recommend adding DB and MA formats, as the math conversions should be straightforward.

- Jeff

283625595744

Search for nanovna and then sort low to high.? It should be the 2nd listing...
Mike WY6K


"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."

@tinhead
That is also my experience. The 10?F cap does not matter. It may be a 22?F or 10 or another. Oscillation It is still worling. Also the coil may be a 2.2?H or a 1.0?H like in some schematics.
Where have you get that info of "always on IP5303" ? In the datasheet of the IP5306 ? and where/what exact parameter ?
Will i order the IP5303 or the IP5306 ? I Already replace two IP5303, but is does not work. It wont start with a load of 50 ... 150mA. I should post later a rapport here.

What’s the item number? I can’t find it

I am tempted to buy another at that price

Dave

On Sun, 29 Sep 2019 at 22:53, James R. Chastain via Groups.Io <suenrod=
[email protected]> wrote:

I just found this and ordered. Thought others might be interested....
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen
50KHz-900MHz | eBay

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NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz...

50KHz-300MHz NanoVNA Vector Network Analyzer HF VHF UHF Antenna Analyzer
2.8" TFT Screen. NanoVNA is a compact h...
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--

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