Re: nanovna Battery Specifications
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;
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Re: Errors of error models. Who is following this and who is confused,
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
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Dr. David Kirkby from Kirkby Microwave Ltd
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
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Re: NanoVNA usable as spectrum analyzer?. Yes, if you know what you are doing
No, you would input the signal into CH1.
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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 ¨¤s 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).
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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).
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DfuSe programming from Android
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
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Dr. David Kirkby from Kirkby Microwave Ltd
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
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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
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283625595744
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On Sunday, September 29, 2019, 06:49:17 PM EDT, Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...> wrote: 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
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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..."
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On Sunday, September 29, 2019, 5:49:17 PM CDT, Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...> wrote: 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
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Re: NanoVNA does not want to start -solved
@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.
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Dr. David Kirkby from Kirkby Microwave Ltd
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
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Yes, I think I saw this price on an auction last week.? If that's the case, I feel sorry for the guy.? He's selling out fast.
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
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On Sunday, September 29, 2019, 5:45:00 PM CDT, James R. Chastain via Groups.Io <suenrod@...> wrote:
I'm betting it's a mistake also.
? ? On Sunday, September 29, 2019, 06:14:57 PM EDT, mike watts via Groups.Io <wy6k@...> wrote:
I certainly don't need another one, but I couldn't resist!? Wonder if it's a scam or a mistake?? Maybe he meant to make it an auction?
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
? ? On Sunday, September 29, 2019, 4:54:06 PM CDT, James R. Chastain via Groups.Io <suenrod@...> 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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Well it says cables/loads/battery included, so if not, I will dispute as "Not as described"
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On Sunday, September 29, 2019, 06:38:10 PM EDT, Roy Appleton <twelveoclockhigh@...> wrote: I look at those numbers entirely differently! I see ONLY 219 and I see his rating already dropped down to 97%! If I wanted to beat the competition I'd price it at say $35. I'll bet IF this comes as a working unit it'll be without battery, cables, etc! OR you got a helluva deal! :-)) On Sun, Sep 29, 2019, 5:21 PM mike watts via Groups.Io <wy6k= [email protected]> wrote: He has 219 transactions, has already sold 39 of these, and 97.3% positive
feedback.? Those are not bad numbers.? But, like you say, we will see...
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin'
the resistance, through the rain and through the night..."
? ? On Sunday, September 29, 2019, 5:09:53 PM CDT, Roy Appleton <
twelveoclockhigh@...> wrote:
? Good luck with that! This may be a case of you get what you pay for! Plus
the guy has low numbers!
Roy
WA0YMH
On Sun, Sep 29, 2019, 4:54 PM 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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| $20.99 |? |
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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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Maybe he just needs some quick cash.? 9 sold in last hour... :-)
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
toggle quoted message
Show quoted text
On Sunday, September 29, 2019, 5:38:10 PM CDT, Roy Appleton <twelveoclockhigh@...> wrote: I look at those numbers entirely differently! I see ONLY 219 and I see his rating already dropped down to 97%! If I wanted to beat the competition I'd price it at say $35. I'll bet IF this comes as a working unit it'll be without battery, cables, etc! OR you got a helluva deal! :-)) On Sun, Sep 29, 2019, 5:21 PM mike watts via Groups.Io <wy6k= [email protected]> wrote: He has 219 transactions, has already sold 39 of these, and 97.3% positive
feedback.? Those are not bad numbers.? But, like you say, we will see...
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin'
the resistance, through the rain and through the night..."
? ? On Sunday, September 29, 2019, 5:09:53 PM CDT, Roy Appleton <
twelveoclockhigh@...> wrote:
? Good luck with that! This may be a case of you get what you pay for! Plus
the guy has low numbers!
Roy
WA0YMH
On Sun, Sep 29, 2019, 4:54 PM 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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| $20.99 |? |
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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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I'm betting it's a mistake also.
toggle quoted message
Show quoted text
On Sunday, September 29, 2019, 06:14:57 PM EDT, mike watts via Groups.Io <wy6k@...> wrote:
I certainly don't need another one, but I couldn't resist!? Wonder if it's a scam or a mistake?? Maybe he meant to make it an auction?
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
? ? On Sunday, September 29, 2019, 4:54:06 PM CDT, James R. Chastain via Groups.Io <suenrod@...> 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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| $20.99 |? |
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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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Yep but I's worth a shot since it's with Paypal
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On Sunday, September 29, 2019, 06:09:53 PM EDT, Roy Appleton <twelveoclockhigh@...> wrote: Good luck with that! This may be a case of you get what you pay for! Plus the guy has low numbers! Roy WA0YMH On Sun, Sep 29, 2019, 4:54 PM 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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| $20.99 |? |
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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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On Sun, Sep 29, 2019 at 01:58 PM, Rune Broberg wrote:
Supporting S1P/S2P files would
be an obvious choice, as it seems to be the standardized exchange format;
but if you can find a reference for the format, it might not be too
difficult to implement. :-)
Hi Rune, Here are a few links regarding s1p/s2p file format. From Keysight (more of an outline): Dr. Kirby's Website: I believe NanoVNA-Saver saves the data as HZ and RI format (Real, Imaginary). (I'm attaching an image, so that others can easily see the format) Bo's RFSim example is in MHZ and MA format (Magnitude, Angle). (image attached) A Matlab routine (I downloaded from Matlab Central) with which I drive my 8753C and that stores the data in MHZ and RI format. (image attached) And Dr. Kirby's examples are in MHZ, and DB format (magnitude in dB, Angle) (see his website) 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. 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. Anyway, nice features to have, if you can ever find the time! Best regards, - Jeff, k6jca
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213 of 219 ratings were positive.? I looked, complaints seem to be mostly shipping time.? I've had no real problems with guys like this - over about 1000 transactions.? So I don't shy away from a deal like this.? However, there is a guy listing an FY817 for $250 - he has been a member since January, has 1 transaction, and included no pictures.? I wouldn't touch that - even with a long pole.... :-)
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
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Show quoted text
On Sunday, September 29, 2019, 5:27:22 PM CDT, Dave Daniel <kc0wjn@...> wrote: 97.3% of 219 transactions is a horrible record. I would never buy sonething from him (but I would look to see what the specific complaints are). DaveD Sent from a small flat thingy On Sep 29, 2019, at 18:20, mike watts via Groups.Io <wy6k@...> wrote:
He has 219 transactions, has already sold 39 of these, and 97.3% positive feedback.? Those are not bad numbers.? But, like you say, we will see...
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
? ? On Sunday, September 29, 2019, 5:09:53 PM CDT, Roy Appleton <twelveoclockhigh@...> wrote:
Good luck with that! This may be a case of you get what you pay for! Plus
the guy has low numbers!
Roy
WA0YMH
On Sun, Sep 29, 2019, 4:54 PM 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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| $20.99 |? |
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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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kb3cs
WY6K Mike Watts
