开云体育

Copper Mountain Networks has the above ebook available at:

Teflon also handles a good bit more heat. In case you plan to solder it to something.

However, do not forget the time base accuracy is 0.5 ppm.

Alan

CREDITS

@Erik, PD0EK - 2 January 2020 - /g/nanovna-users/message/9053
previous : gin&pez@arg - 2 January 2020 - /g/nanovna-users/message/9055

Dear Erik,

Well, we just realized that the finding of this very paper along with the
[NanoVNA] appearance, as well as the foundation and existence of this very
Group and its openly and free given very specific instructions, were the decisive
facts that made our decision to re-consider seriously the whole VNA object in
our SOW from the very beginning FACUPOV and within the frame of the Radio
Amateur Knowledge.

Thank you, once more.

Kind regards,

gin&pez@arg

From: KEN G4APB: it was showing as ‘STM device in DFU mode’ and now it says STM32 Bootloader.

Would one of these inexpensive devices solve your problem? I bought one (just in case) but haven't needed to use it.

I see in the review in the Jan/Feb 2020 QEX that the minimum resolution is 1 kHz and scanning a crystal might give a close approximation of its resonant frequency but not much else.

I used nanoVNA Saver to scan a 4.915 MHz crystal with a resolution of about 4 Hz and it looks like I'd have the info necessary to calculate the motional parameters. I'm not sure if I'm trying to fool myself in going around an inherent limitation or not though. I measured a 3 dB BW of about 100 Hz but in another system I got 69 Hz. So that's a pretty big difference.

I'm still in the early stages of understanding the thing though.

73-

Nick, WA5BDU
==================================

Nick,

Newer firmware than QEX tested may give better resolution. I thought there was a simple table of what was available, but take a look at:

/g/nanovna-users/message/8087
/g/nanovna-users/attachment/8087/0/NanoVNA_firmwares_20191210.pdf

Bear in mind that the stand-alone device has a 101 point scan, so if you need 4 Hz resolution limit the scan to 400 Hz, Alternatively, use the NanoVNA-saver software which allows multiple scans to be combined as a number of segments, so you might use 10 segments to over a 4 kHz scan, or perhaps 10 segments of 1 kHz each to get a 10 kHz scan with 10 Hz resolution. It's easier than it sounds.

73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv

Hello Ed
SDR-Kits has both SMA and BNC calibration kits which is documented. Soon there will also be 5 parts N calibration kit The 4 parts BNC and N kit is universal as being both male and female. Individual data for each kit will be provided on a paper slip for BNC and N and also as downloaded calibration kit file suited for the VNWA, which is a file to read with a text editor for copy paste purpose.
For the SMA find the documentation in attached file or from my homepage link below
As the NanoVNA does not have facilities for settings of calibration kit data (assumes ideal kit) the application NanoVNA-saver by Rune Broberg has facilities for entering such individual calibration kit data.
to May 2017 calibration kit.pdf
If you chose this way to get good quality calibration kit do not hesitate to contact me for how to utilize the NanoVNA-saver facilities as there are some details to consider with the NanoVNA-saver.
Kind regards
Kurt



-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Ed Jones
Sendt: 2. januar 2020 14:59
Til: [email protected]
Emne: [nanovna-users] Calibration standards

I'm a newbie and my only experience with VNAs is borrowing a friend's AIM
4170 from time to time for antenna measurements. I recently purchased a NanoVNA-H and am waiting for it to arrive. I was thinking of building some calibration standards for SMA and N (both sexes) but I have almost talked myself out of it. I don't have access to a precision VNA to accurately measure any standards that I build and I don't think I can accurately measure the offset length to virtually move the reference plane. For now, my needs only require measuring up to 500MHz but it would be nice to go 1.2GHz in the future. My needs are strictly amateur, but I would like the ability to accurately measure home made phasing lines, power dividers, chokes, etc. Can anyone recommend standards meant for amateurs that are of decent quality and come with measurement data?

Thanks!
--
Ed Jones - K8MEJ

I see in the review in the Jan/Feb 2020 QEX that the minimum resolution is 1 kHz and scanning a crystal might give a close approximation of its resonant frequency but not much else.

I used nanoVNA Saver to scan a 4.915 MHz crystal with a resolution of about 4 Hz and it looks like I'd have the info necessary to calculate the motional parameters. I'm not sure if I'm trying to fool myself in going around an inherent limitation or not though. I measured a 3 dB BW of about 100 Hz but in another system I got 69 Hz. So that's a pretty big difference.

I'm still in the early stages of understanding the thing though.

73-

Nick, WA5BDU

Look here
/g/nanovna-users/wiki/RF-Calibration%2C-considerations%2C-notes

--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

ann : next-to-come : the complete "demystification" of the "VNA measurements" kind

#100: Any 2-port Introduces Relations of Moebius Transformation Between g an G

Hello,

Allow us, please, to present these two ways, g is a Moebius Transformation of G,
and G is a Moebius Transformation of g:



Sincerely,

gin&pez@arg

:100#

I'm a newbie and my only experience with VNAs is borrowing a friend's AIM
4170 from time to time for antenna measurements. I recently purchased a
NanoVNA-H and am waiting for it to arrive. I was thinking of building some
calibration standards for SMA and N (both sexes) but I have almost talked
myself out of it. I don't have access to a precision VNA to accurately
measure any standards that I build and I don't think I can accurately
measure the offset length to virtually move the reference plane. For now,
my needs only require measuring up to 500MHz but it would be nice to go
1.2GHz in the future. My needs are strictly amateur, but I would like the
ability to accurately measure home made phasing lines, power dividers,
chokes, etc. Can anyone recommend standards meant for amateurs that are of
decent quality and come with measurement data?

Thanks!
--
Ed Jones - K8MEJ

@Erik, PD0EK - 2 January 2020 - /g/nanovna-users/message/9053

Dear Erik,

Thank you very much for the attached paper.

Yes, indeed, we found and took a look at it some months ago.

Regards,

gin&pez@arg

DISCLAIMER - I have no pecuniary interest in Gigaparts or Gigaparts.com

Actually I ordered a NanoVNA from Gigaparts... (claim of consistency and quality versus china direct) Received it in 2 days...
They had a BLACK FRIDAY EXTENDED sale then......
I also ordered one as a 2nd Prize for our club Raffle -- on LEAP YEAR Day -29th of February 2020... Our 2nd Dead of Winter Extravaganza...Sadie Hawkins hide out at VFW post 3115 Amateur Radio Club -W?VFW Wichita, KS. Noon -5pm Chili - Dogs, Demo's, Eyeballs, Show n' Tell.. More Info [email protected]

I just checked -- GIGAPARTS has the NanoVNA MODEL H as well......HurraH --- makes you Happy...

I think Free shipping if over $100.. They have have a few sub $100 HT's. When I bought the door prize, 1ST prize was a FT-70DR Fusion HT and the two were shipped free, no tax..You can place your order today via a 1-800 number or on line, even get a tracking UPS or USPS number UPS I believe still auto insures for $100..

Happy New Year....
Larry W8LM
My 2020 resolution is NO MORE LENDING MONEY- This especially means YOU!!!

On Thu, Jan 2, 2020 at 04:54 AM, gin&pez@arg wrote:

In fact, ANY VNA that provides to The Common User these 4 measurement
sets, it does this on the purpose to implement a Moebius Transformation of
G to g.

@pin&pez@arg

I assume you are aware of attached paper by Thomas C. Baier from 2009

--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

You might want to see my post here:

/g/nanovna-users/message/8893

johnm - KK4VUR

There is nothing in the 'Book' that is not already published on the groups.io site.
YMMV but I think I would prefer the groups.io resource.
==================================

Mike,

To be up-to-date, I agree with you.

But for ease of carrying - not to mention actually having a contents list and searching - and when you are away from the Internet, the book is unbeatable! I do hope it will be kept up-to-date, and perhaps it can be offered via Lulu (does that still exist?) so that folk who prefer a printed copy can obtain one.

Cheers,
David
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv

#99 : Does [NanoVNA] Implement a Moebius Transformation of G to g ?

Hello,

Well, the answer to this rhetorical question is definitely : Yes !

Simply because it delivers to The Common User, who uses [NanoVNA]
command "data" [68], the necessary four 4 measurement sets, which it
names as : "short (circuit)", "(matching) load", "open (circuit)", plus that
of "unknown" one, that is in our SOW : "s", "l", "o", "g", respectively,
when The Common User operates it as a [LeastVNA] [73'], so a Moebius
Transformation of G to g shall be implemented * c o m p l e t e l y * by
any [NanoVNA], as long as it makes available to The Common User 4
such measurement sets, of course.

In fact, ANY VNA that provides to The Common User these 4 measurement
sets, it does this on the purpose to implement a Moebius Transformation of
G to g.

Sincerely,

gin&pez@arg

REFERENCES

[68] : "Q 01 GON : What were the Putty commands you used to extract data
from the NanoVNA?", "On The Most Reliable Comparison of [NanoVNA] with
any laboratory [VNA]":
22 October 2019 - /g/nanovna-users/message/5498

[73'] : "(2) "The Least VNA" is simply AnyVNA that is used as a Reflectometer or
Impedance Meter in terms of frequency of One-Port devices using the well-known
("standard", 'Standard' or Standard) set of three 3 loads {S, L, O}, all with known
nominal values given respectively, not at all by us but by their manufacturers, as
the so-called "{-1, 0, +1}" or whatever similar", #73 ' : On the sine qua non Core
Uncertainty of AnyVNA - incl. NanoVNA - System (the message #73 is withdrawn
mainly because its conclusion is too weak)":
6 November 2019 - /g/nanovna-users/message/6529

:99#

Well, read that as "easy to prototype" ;) Right now I can easily assemble 5 prototypes in an hour or so (after JLC has put on all the passives that is) and as a design that we also might use internally and make variants of, this is important because some variants might only have 10 units built in total. Prototype assembly is otherwise very expensive.

What Amazon seller did you get yours from?

Thanks,
Tom Stiles