Re: The Male Calibration Kit for AliExpress
Many thanks, Kurt. I purchased a similar-looking set from eBay a few weeks ago.
- Jeff
|
The Male Calibration Kit for AliExpress
Hi All
I have created a pdf document for the N male calibration kit mentioned
earlier to day, where the link probably will work better and the data plus
hints are included
Maybe some one want to put it on the WiKi
Kind regards
Kurt
|
Re: Problem with cho45 web interface
Works perfektly with hugen's new firmware. Thanks.
|
Wondeful, that is exactly what I was looking for !!
Thanks for the link !!!
?TypeApp for Android herunterladen ?
Am 19. Okt. 2019, 09:35, um 09:35, "Starsekr via Groups.Io" <starsekr@...> schrieb:
toggle quoted message
Show quoted text
W. Reeve, T. Hagen, K. Poulsen published some data from and described
their techniques of measuring ferrite beads in "Radio Astronomy
Magazine" in 2013. They did a lot of work developing test fixtures
and error analysis. You can find their papers at :
|
Re: N male calibration kit
Hi Praveena The male short Offset is 18.5ps The male open Offset is 20.5ps or if you want to enter the C coefficient then: The male open Offset is 17.4ps C0=62.14 C1=-143.07 C2=82.92 C3=0.78 For the load you may measure the resistance by mounting it in a female bulkhead adaptor and sending a constant current of 100mA through the load and measure the voltage drop followed by using ohms law ? The might for the load be an inductive or capacitive parasitic component. Try to sweep a short test cable of 0.5m from 50KHz to 9000MHz and observe two traces. Smith chart and a Mag dB trace. The Smith chart shall show a trace running slightly inwards with increasing distance to the circumference and the Mag dB trace flat horizontal up to about 100MHz then sloping downward against a linear running above 300MHZ with linear increasing loss. If not so then tune the load inductance either as a small positive number (inductive load)or negative (capacitive load) until the best possible result. NonoVNAsaver does not yet support shunt C so a negative inductance will do the job adequately. Do not tune the short and open. I attach an image for the s11 return loss. You should see a trace sloping down up to 300MHz like on the picture. The trace have run from 0.1dB to 0.2dB at 900MHz but does not, due to the imperfection of the NanoVNA and lag of error correction. This sweep was for a professional Airline with so to speak no loss, but sweeping a traditional test cable you will see more loss at 300 as well at 900MHz. However the task is never to measure impedances close to the edge of the Smithchart but ensuring above setting helf the accuracy at impedances of interest up to some 5K maybe 10K ohm. Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] < [email protected]> P? vegne af Praveena NG Sendt: 19. oktober 2019 13:40 Til: [email protected]Emne: Re: [nanovna-users] N male calibration kit Hi Kurt, Request to share data to be entered in nano vna saver for n type calibration kit, Regards, Praveena
On Sat, Oct 19, 2019, 4:19 PM Kurt Poulsen < <mailto:kurt@...> kurt@...> wrote: Hi All Some years ago I bought a N male clone calibration kit which is a HP85032E clone kit. It is not that bad(pretty good) and data are very close to what can be found on the Agilent homepage. To day I bumped into the kit again on Aliexpress at the following link <> .0.0.4 fe1303fMMImSf < t.0.0.4fe1303fMMImSf> < <> . 4fe1303fMMImSf&algo_pvid=6d6a9d32-85a8-428f-a09e-b2a6fc1e830e&algo_exp id=6d6 a9d32-85a8-428f-a09e-b2a6fc1e830e-1&btsid=afe902d6-210b-40cb-9ac8-21ed ca20b2 40&ws_ab_test=searchweb0_0,searchweb201602_10,searchweb201603_52 < t.0.0.4fe1303fMMImSf&algo_pvid=6d6a9d32-85a8-428f-a09e-b2a6fc1e830e&al go_expid=6d6a9d32-85a8-428f-a09e-b2a6fc1e830e-1&btsid=afe902d6-210b-40 cb-9ac8-21edca20b240&ws_ab_test=searchweb0_0,searchweb201602_10,search web201603_52>
&algo_pvid=6d6a9d32-85a8-428f-a09e-b2a6fc1e830e&algo_expid=6d6a9d32-85 a8-428 f-a09e-b2a6fc1e830e-1&btsid=afe902d6-210b-40cb-9ac8-21edca20b240&ws_ab _test= searchweb0_0,searchweb201602_10,searchweb201603_52 So if you purchase a set I can provided the data to enter in the NanoVNA-saver and you will be in good shape calibration male N Kind regards Kurt
|
Re: Abbreviated documentation for more simplistic tasks?
On Sat, Oct 19, 2019 at 06:48 AM, Dick wrote:
ps: still trying to figure out a Smith Chart
Dick, some years ago I wrote up some notes on the Smith Chart (basically describing where those funny curves come from). It might not be what you are looking for, but if interested, go here: - Jeff, k6jca
|
Re: Abbreviated documentation for more simplistic tasks?
From: Dick
I am all in favor of a "VNA For Dummies" book !!
73, Dick, W1KSZ
ps: still trying to figure out a Smith Chart
========================================================
Dick,
Such a book was published for the DGS8SAQ VNWA 2/3 Vector Network Analyser.
While it's for different hardware, the basic principles should be the same. You might look out for videos by DGS8SAQ as well.
73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv
|
I too am a prospective buyer and I joined this group hoping to elicit more information. However the volume of argument over esoteric minutiae is putting me off. I agree with the call for simplified documentation to enable users to be able to use the device "out of the box" and for simple tasks. I think many purchasers/users of this item will be hobbyists attracted by the price which is a tiny fraction of that of other commercially available products. Professionals will already be using professional equipment and trying to make this device perform the same seems beyond the scope of it's design parameters.
Tom G6PZZ
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of hamrad45 Sent: 19 October 2019 14:50 To: [email protected]Subject: [nanovna-users] Newbie I recently saw a YouTube video on these devices and I am very interested in getting one. Checking Amazon for instance, there are dozens of sellers of these and prices range from $35 to $85. I have no idea which one to get and which sellers are better. Any info would be greatly appreciated. My YouTube ID is hamrad88. Thanks, Tom Stiles
|
I bought one from here... It seems to work OK and and has the shielding fitted.
|
On Sat, Oct 19, 2019 at 05:58 AM, <erik@...> wrote:
would it also be possible to recalculate the sweeped data in the main window
with the new values from the updated calibration standard?
Rune, I also think this is a great idea. Calibration standard tuning is here to stay :>). Calibration tuning works much better in nanoVNA-Saver than the electrical delay tuning in the nanoVNA firmware version 0.2.3. I am not sure what the differences might be. -- Bryan, WA5VAH
|
Re: Abbreviated documentation for more simplistic tasks?
Oristo, You make some good points. Perhaps the tutorial assumes the user buys a particular nanoVNA, such as from Hugen. A better solution would be to cover the the more popular variants with section headings that clearly state whether or not the reader will care about that particular section. For example: Did your unit not arrive with a battery included, a rectangular silver lump between the main PC board and the back panel? Then you either must always have power applied through the USB connector when using it, or you will have to obtain and install a battery. Here are potential sources for a battery, and how to install it ..... When you first turn it on, if the screen looks like this photo: <photo> Then instructions for navigating the menus are as follows .... The basic instructions should point to a good document on how to download different firmware. But I'd assume that any firmware will be sufficient for basic use, such as finding the SWR of an antenna or the response of a filter. Or determining the complex impedance of a load. A good beginner's document will indeed be tough to get right, for lots of reasons. I'd think it will have to be an integrated whole written by one author, Supplementary material could be pointers into the wiki, though I'm a bit worried about random people going in and "fixing" wiki pages. Perhaps once the wiki has developed some, we have a group of knowledgeable people evaluate/edit the key material into a User's Guide. Jerry, KE7ER
On Sat, Oct 19, 2019 at 04:43 AM, Oristo wrote:
Introductions are tough; new owners may be impatient as well as uninformed
and/or misinformed.
NanoVNAs are not all the same; some have battery, calibration kit and already
touch screen and SOLT calibration.
* How many new users want to go thru exhaustive instructions for all?
Some menus and functions change among firmware versions
* Should new user instructions first try to install some latest stable
firmware?
|
I recently saw a YouTube video on these devices and I am very interested in getting one. Checking Amazon for instance, there are dozens of sellers of these and prices range from $35 to $85. I have no idea which one to get and which sellers are better. Any info would be greatly appreciated. My YouTube ID is hamrad88.
Thanks,
Tom Stiles
|
Re: Abbreviated documentation for more simplistic tasks?
I am all in favor of a "VNA For Dummies" book !! 73, Dick, W1KSZ ps: still trying to figure out a Smith Chart Sent from Outlook<> ________________________________ From: [email protected] < [email protected]> on behalf of YT9TP - Pedja via Groups.Io <yt9tp@...> Sent: Saturday, October 19, 2019 6:44 AM To: [email protected] < [email protected]> Subject: Re: [nanovna-users] Abbreviated documentation for more simplistic tasks? On 19.10.2019 15:21, Dr. David Kirkby from Kirkby Microwave Ltd wrote: So in summary, I would advise against recommending newcomers look to
YouTube for information. But, if someone who knows make selection and list tutorials that are good that would make a difference, right? -- 73, Pedja YT9TP Checkout:
|
Re: Abbreviated documentation for more simplistic tasks?
On 19.10.2019 15:21, Dr. David Kirkby from Kirkby Microwave Ltd wrote: So in summary, I would advise against recommending newcomers look to
YouTube for information. But, if someone who knows make selection and list tutorials that are good that would make a difference, right? -- 73, Pedja YT9TP Checkout:
|
Re: Abbreviated documentation for more simplistic tasks?
Dr. David Kirkby from Kirkby Microwave Ltd
On Thu, 17 Oct 2019 at 05:39, YT9TP - Pedja via Groups.Io <yt9tp= [email protected]> wrote:
On 16.10.2019 19:01, N9KDY wrote:
Not, "Is there?" but what are some of the more simple functions of this
thing which might benefit beginning users, so that as I run into them I
can perhaps write some? That is great idea. Most people need nanoVNA for quite simple tasks.
That said, there are number of useful tutorials on YouTube. Listing them
would also help new users.
--
73,
Pedja YT9TP
Unfortunately, almost all the YouTube videos on VNAs have serious mistakes. One was discussed on here a week or so ago. Another by the same author is flawed too, which I have discussed with him privately. There are numerous videos on making VNA calibration kits which are flawed. There¡¯s a video on how to do a 2-port calibration of an HP 8753 VNA which is flawed. I am personally of the opinion that YouTube is full of people making videos about subjects they have little knowledge of. The unfortunate thing is that these people get lots of thumbs up, and lots of followers. This is one of my favourites for an idiot that has 50500 followers, get 97% thumbs up for his video, yet is fundamentally flawed in numerous ways. We have this idiot with 229,000 subscribers measuring the noise on the 6.5 digit multimeter by looking at how much the digits change when connected to a laboratory power supply. He does not appreciate that a power supply would have far more noise than a 6.5 digit multimeter. So in summary, I would advise against recommending newcomers look to YouTube for information. I would also point out that most hams don¡¯t understand complex mathematics. Most don¡¯t know what resonance is. I would consider a basic introduction should consider VSWR and transmission and reflection from filters. 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
|
Re: Abbreviated documentation for more simplistic tasks?
|
Re: Abbreviated documentation for more simplistic tasks?
On Thu, 17 Oct 2019 at 18:09, KV5R <kv5r@...> wrote: As a former industrial instrument technician (having calibrated thousands of things), followed by 4 years of writing procedures, I can tell you it isn't easy! as procedures need to be general enough to cover variables in use-cases, but specific enough to be useful. Indeed, as publisher of a rather large how-to web site, I still find users' sending questions of details not adequately covered, even on long and detailed articles I wrote 20 years ago. In theory, a wiki is a very good answer to the very real problems of having one person write and maintain all of the comprehensive documentation for an open source project. The community can do a more efficient job than a single person. For example, I might be interested in the TDR aspects, so I might work on the TDR pages in the wiki. Someone else is interested in the Smith Chart, and she works on those pages. Someone else is interested in hardware mods, and he works on those pages. You get the idea. This is theoretical, because it seems very difficult to convince community members (in any open source project) to maintain the wiki pages they find interesting/in need of work. --buck
|
Hello Joe,
it looks good! I hope the software lived up to your expectations, and that
you will enjoy using it in the future :-)
--
Rune / 5Q5R
toggle quoted message
Show quoted text
On Fri, 18 Oct 2019 at 16:22, Joe F. KC8RKL <yfahrenh@...> wrote: Hello Rune-
Thanks for the fantastic software! I built an 11-pole 500 kHz Low Pass
Chebyshev filter using AADE Filter Design software back in 2010 for use
with a Softrock LF Ensemble II SDR kit. It seemed to work as expected, but
with NanoVNA and NanoVNA-Saver I was finally able to do a 'proper'
analysis- see the attached images. Also, thank you Hugen and edy555 for the
fantastic hardware!
73,
Joe F. KC8RKL
|
Hi Erik,
that's a very good point. The data is available in the application to do so
- I think it probably should. :-)
--
Rune / 5Q5R
toggle quoted message
Show quoted text
On Sat, 19 Oct 2019 at 12:58, <erik@...> wrote: Rune,
When changing values of the calibration standard I assume clicking "apply"
makes them effective even without doing a full recalibration.
If this is correct, would it also be possible to recalculate the sweeped
data in the main window with the new values from the updated calibration
standard?
This will allow quicker search for optimal C0 and L0 values because
otherwise you have to do a sweep to see the effect of the updated C0 and L0
values. Correct?
|
Rune,
When changing values of the calibration standard I assume clicking "apply" makes them effective even without doing a full recalibration.
If this is correct, would it also be possible to recalculate the sweeped data in the main window with the new values from the updated calibration standard?
This will allow quicker search for optimal C0 and L0 values because otherwise you have to do a sweep to see the effect of the updated C0 and L0 values. Correct?
|
Kurt Poulsen
David J Taylor
Dick
YT9TP - Pedja
Oristo