Re: can't find a suitable #battery connector
#battery
just desolder connector and solder wires directly to the pcb. My NanoVNA don't have battery connector at all.
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can't find a suitable #battery connector
#battery
Hi
myy NanoVNA was shipped w/o a battery. Thought that's no problem, opened the back cover and realized that my battery doesn't fit into the connector which is installed on the board. You can see it in the pictures. I also can't find any usable JST jacks for surface mountings in the internet.
Does anyone know where to find a suitable battery with the right plug and right polarity?
73 Carsten DL8AAP
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Re: WINDOZE BASED APPS for the NANO VNA
Dave,
You are very welcome. :-)
--
Rune / 5Q5R
toggle quoted message
Show quoted text
On Fri, 15 Nov 2019, 01:35 David Eckhardt, <davearea51a@...> wrote: Thanks, Rune. That SW is a downright winner. Thank you!!!!!!!
Dave - W?LEV
On Thu, Nov 14, 2019 at 10:49 PM Rune Broberg <mihtjel@...> wrote:
Hi David,
the .dfu files are firmware versions for the NanoVNA.
There are several Windows apps available for the NanoVNA. I made
NanoVNA-Saver:
Other options are NanoVNASharp and TAPR VNA.
Good luck with your NanoVNA :-)
--
Rune / 5Q5R
On Thu, 14 Nov 2019 at 23:38, David Eckhardt <davearea51a@...>
wrote:
Are there any and where online do I find them? The file extensions I am
seeing are "DFU" which is an Apple thing.
No tthat I particularly believe in Windows, but all my engineering and
scientific applications run under Windows and not Apple.
This is my first post to this group, so please forgive me if this has been
asked previously. .
--
Dave - W?LEV
--
*Dave - W?LEV*
*Just Let Darwin Work*
*Just Think*
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Re: Performance of 1:1 Balun
Hi Nan
VNA2180 that Steve used have 50 ohm impedance on both ports (A & B). So those formulas will work if vna ports of NanoVNA have 50 ohm impedance. But do they?
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The crossover point between the real and imaginary part of the complex permeability is a good marker on the usable bandwidth or upper application frequency for the ferrite. Obviously the higher perm units have a crossover point well below a few MHz. The lower perm units, say 120, 65, or 40 can extend the crossover to 10 or even 100 MHz. Higher perm, 1500, 2500, etc.... are confined to much lower frequency. You could catalog your VNA measurements for KNOWN curves and then sort your UNKNOWN perm material in than manner. That is what I have done in the past. Then I paint white out on my black ferrite material and mark their perm value with a black Sharpie pen.
Actually obtaining the accurate permeability or for that manner the dielectric K factor for TLine materials is fairly involved and the papers I have seen to extract these values required the complete 2 port S parameters. NIST has a number of papers addressing the measurement technique.
Alan
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Re: Parameter Explanation Please
I am retired and I like to learn new things. I am a ham and l like experimenting with antennas.
I am interested in xfmrs for efhw antennas. I have a VNWA and thought it would be fun to play with the nanovna too, seeing as it only cost $45.00.
I read a lot of Owen Duffy¡¯s articles and like to try out his experiments while learning a bit about rf.
The nanovna uses different terminology than the VNWA but I think I understand the differences.
When my nano arrives I can do comparisons between the two.
Larry
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David F4HTQ wrote:
"finally I do not wait for the weekend :)"
-------------------------------------------------------------------------------------
The test method you described seemed simple enough to give it a quick go. Attached is a photo of the test set-up I used. One turn of wire attached to a Banana-BNC adapter and connected to CH0, hopefully similar to your description.
I pulled out the first ferrite core I could find and measured it. The initial curve from 100k-30M looked like junk below 1M and not enough definition at 30 MHz. I changed the range to 1M -100M. The core is definitely not type 43 and pretty broadband in nature. I measured two other cores just like it and their curves overlapped. Found identifying markings on the cores - Laird type 28B2400-000. Found the curves for Laird 28B on-line and have attached them.
The Laird 28B series is definitely broadband but not sure I could have identified my cores from the Laird curves without priori information. The NanoVNA curves for all three cores did match and I suppose I could build up a signature database and use it to sort unknown ferrites.
Thanks for giving me another idea for using the NanoVNA.
- Herb
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Re: NanoVNA AURSINC v H, Q-0.4.3, images
On Thu, Nov 14, 2019 at 06:48 PM, Dana Whitlow wrote: Results with an S21 measurement of a fairly lossy DUT
Because I am new to all this, I'd need some specifics about that. This thread is comparing what is apparently two VNAs from different Chinese sources. I will pull the case in a few days and compare both internals. Meanwhile, I used the earlier cal, and mounted an MFJ-1714 tele antenna on a tripod at the end of 3.5 m of RG3416. AURS left; H, right. Very similar, I think? I made the mistake of not setting the AURS marker on 146 MHz, as I did for the H.. -- 73 de Rich NE1EE On the banks of the Piscataqua
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Re: Replacement Power switch
Check out e-Pay. You can get 50 pcs for $1.25 AND free shipping. 73, Dick, W1KSZ ________________________________ From: [email protected] < [email protected]> on behalf of Bob Albert via Groups.Io <bob91343@...> Sent: Thursday, November 14, 2019 5:34 PM To: [email protected] < [email protected]> Subject: Re: [nanovna-users] Replacement Power switch I would like one or two of those switches. I live in Los Angeles. Where did you get them, and are you willing to sell me a few? Bob On Thursday, November 14, 2019, 03:04:26 PM PST, Herman De Dauw <on1bes@...> wrote: I have 50 pieces of it (could not buy less) . I get them on Ebay search string "50PCS Slide Switch SK12D07VG2 Toggle Switch 2mm Stents Toggle Switch UK". U must have exact the right type. You can mail me a PM. on1bes Herman
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Re: Replacement Power switch
As Herman said, they can be had on eBay
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finally I do not wait for the weekend :)
This is the curve for 61
( one turn of emailled wire on BN61-202)
There is the corresponding curve on manufacturer website
And finaly for the 73
( one turn of emailled wire on BN73-202)
and the manufacturer curve:
David.
toggle quoted message
Show quoted text
-----Message d'origine----- De : [email protected] [mailto: [email protected]] De la part de David F4HTQ Envoy¨¦ : vendredi 15 novembre 2019 01:04 ? : [email protected]Objet : Re: [nanovna-users] NanoVNA-Saver 0.2.0 Hi Herb, For the curve i post as example, i just made one tun of emailled wire of BN43-202 ferrite. I also obtained accurates results with 61 and 73 ferrites materials. (I don't own 31 material). I could post some curves this weekend. The annoying limitation is that the measurements sent by the NanoVNA become imprecise when the reactive part of the inductance becomes too weak compared to the resistive part. This happens near 40MHz for the material 43, 6MHz for the 73 and 70MHz for the 61. You can't miss this issue because the X becomes negative, as with a capacitor! Regards, David, F4HTQ. -----Message d'origine----- De : [email protected] [mailto: [email protected]] De la part de hwalker Envoy¨¦ : vendredi 15 novembre 2019 00:38 ? : [email protected] Objet : Re: [nanovna-users] NanoVNA-Saver 0.2.0 On Thu, Nov 14, 2019 at 02:06 PM, David F4HTQ wrote: " The values do not match those of the constructor curve ( to have the right value the software might know the exact geometry of the inductor) , but the shape is absolutely identical. This allow to easy identify unknown ferrite core, and to better understand how to use it in a RF device. For example, here is the true curve of material 43 of Fair rite. And here's the one I got with NanoVNASaver ------------------------------------------------------------------------------------------------------------------------------------------------ David that helps to explain the purpose of the new charts. I was wondering if you might answer the following questions when you get some time. 1. I visited your web site but did not see an article about ferrite core measurements. What test set-up did you use to generate the Complex-Perm-vs-Freq plots? 2. Since you used the shape of the curves rather than the permittivity values to identify the type material, do you have atypical plots for different material types (i.e. 31, 43, 61) and how well did they match the corresponding Fair-rite corporation curves? I also have accumulated numerous ferrite material over the years. Some marked but the majority unmarked. I'd love to have a way of sorting them by type and doing so visually by the shape of their curve, as you propose, would be good enough for me. Regards, - Herb
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Re: WINDOZE BASED APPS for the NANO VNA
Thanks, Rune. That SW is a downright winner. Thank you!!!!!!!
Dave - W?LEV
toggle quoted message
Show quoted text
On Thu, Nov 14, 2019 at 10:49 PM Rune Broberg <mihtjel@...> wrote: Hi David,
the .dfu files are firmware versions for the NanoVNA.
There are several Windows apps available for the NanoVNA. I made
NanoVNA-Saver:
Other options are NanoVNASharp and TAPR VNA.
Good luck with your NanoVNA :-)
--
Rune / 5Q5R
On Thu, 14 Nov 2019 at 23:38, David Eckhardt <davearea51a@...>
wrote:
Are there any and where online do I find them? The file extensions I am
seeing are "DFU" which is an Apple thing.
No tthat I particularly believe in Windows, but all my engineering and
scientific applications run under Windows and not Apple.
This is my first post to this group, so please forgive me if this has been
asked previously. .
--
Dave - W?LEV
--
*Dave - W?LEV*
*Just Let Darwin Work*
*Just Think*
|
Re: Replacement Power switch
I would like one or two of those switches.? I live in Los Angeles.? Where did you get them, and are you willing to sell me a few?
Bob
toggle quoted message
Show quoted text
On Thursday, November 14, 2019, 03:04:26 PM PST, Herman De Dauw <on1bes@...> wrote:
I have 50 pieces of it (could not buy less) . I get them on Ebay search string "50PCS Slide Switch SK12D07VG2 Toggle Switch 2mm Stents Toggle Switch UK".
U must have exact the right type. You can mail me a PM.
on1bes Herman
|
This is the topic that lead me to the nanoVNA
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Hi David How is you test setup ? A single short wire thru the core ? Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] < [email protected]> P? vegne af David F4HTQ Sendt: 14. november 2019 23:06 Til: [email protected]Emne: Re: [nanovna-users] NanoVNA-Saver 0.2.0 Hi All, I add some explanations. I asked Rune if he could add this graphic because it is very useful. It display curves that have exactly the same shape as the complex permitivity curves (¦Ì'r and ¦Ì''r) of the ferrite datasheets. The values do not match those of the constructor curve ( to have the right value the software might know the exact geometry of the inductor) , but the shape is absolutely identical. This allow to easy identify unknown ferrite core, and to better understand how to use it in a RF device. For example, here is the true curve of material 43 of Fair rite. And here's the one I got with NanoVNASaver It works really well. David, F4HTQ.
-----Message d'origine----- De : [email protected] [mailto: [email protected]] De la part de Rune Broberg Envoy¨¦ : mercredi 13 novembre 2019 08:23 ? : [email protected] Objet : Re: [nanovna-users] NanoVNA-Saver 0.2.0 Hi John, my experiments in this field have been very limited - the feature was added with the encouragement of David F4HTQ. He submitted to me an S2P file of a measurement of a toroid, and a curve shape: He believed this could be approximated as R/¦Ø and X/¦Ø, so I implemented it, and managed to create the following graph: [image: image.png] Which seemed to fit quite well, even though the units aren't exactly the same. So, for now, all I know how to do is: Given a permeability chart from a manufacturer, replicate the same curve shape vs frequency using the NanoVNA. I hope it's useful ;-) -- Rune / 5Q5R On Wed, 13 Nov 2019 at 01:22, John AE5X <ae5x@...> wrote: Now that the capability is there in the software, how would one use
the NanoVNA to check a toroid's permeability? New territory for me...
:-)
|
Hi Herb,
For the curve i post as example, i just made one tun of emailled wire of BN43-202 ferrite.
I also obtained accurates results with 61 and 73 ferrites materials. (I don't own 31 material).
I could post some curves this weekend.
The annoying limitation is that the measurements sent by the NanoVNA become imprecise when the reactive part of the inductance becomes too weak compared to the resistive part. This happens near 40MHz for the material 43, 6MHz for the 73 and 70MHz for the 61. You can't miss this issue because the X becomes negative, as with a capacitor!
Regards,
David, F4HTQ.
toggle quoted message
Show quoted text
-----Message d'origine----- De : [email protected] [mailto: [email protected]] De la part de hwalker Envoy¨¦ : vendredi 15 novembre 2019 00:38 ? : [email protected]Objet : Re: [nanovna-users] NanoVNA-Saver 0.2.0 On Thu, Nov 14, 2019 at 02:06 PM, David F4HTQ wrote: " The values do not match those of the constructor curve ( to have the right value the software might know the exact geometry of the inductor) , but the shape is absolutely identical. This allow to easy identify unknown ferrite core, and to better understand how to use it in a RF device. For example, here is the true curve of material 43 of Fair rite. And here's the one I got with NanoVNASaver ------------------------------------------------------------------------------------------------------------------------------------------------ David that helps to explain the purpose of the new charts. I was wondering if you might answer the following questions when you get some time. 1. I visited your web site but did not see an article about ferrite core measurements. What test set-up did you use to generate the Complex-Perm-vs-Freq plots? 2. Since you used the shape of the curves rather than the permittivity values to identify the type material, do you have atypical plots for different material types (i.e. 31, 43, 61) and how well did they match the corresponding Fair-rite corporation curves? I also have accumulated numerous ferrite material over the years. Some marked but the majority unmarked. I'd love to have a way of sorting them by type and doing so visually by the shape of their curve, as you propose, would be good enough for me. Regards, - Herb
|
That would be permeability. Physics degree not withstanding. I never could keep them straight! Dave - W?LEV On Thu, Nov 14, 2019 at 11:55 PM David Eckhardt via Groups.Io <davearea51a= [email protected]> wrote: Yes, what was your setup for the type 43 material permittivity measurement?
Dave - W?LEV
On Thu, Nov 14, 2019 at 10:32 PM Bob Albert via Groups.Io <bob91343=
[email protected]> wrote:
David, can you explain exactly how you got the curves? I would like to
do it also.
Bob
On Thursday, November 14, 2019, 02:06:06 PM PST, David F4HTQ <
f4htq@...> wrote:
Hi All,
I add some explanations.
I asked Rune if he could add this graphic because it is very useful.
It display curves that have exactly the same shape as the complex
permitivity curves (¦Ì'r and ¦Ì''r) of the ferrite datasheets.
The values do not match those of the constructor curve ( to have the right
value the software might know the exact geometry of the inductor) , but the
shape is absolutely identical.
This allow to easy identify unknown ferrite core, and to better
understand how to use it in a RF device.
For example, here is the true curve of material 43 of Fair rite.
And here's the one I got with NanoVNASaver
It works really well.
David, F4HTQ.
-----Message d'origine-----
De : [email protected] [mailto:[email protected]] De la part
de Rune Broberg
Envoy¨¦ : mercredi 13 novembre 2019 08:23
? : [email protected]
Objet : Re: [nanovna-users] NanoVNA-Saver 0.2.0
Hi John,
my experiments in this field have been very limited - the feature was
added with the encouragement of David F4HTQ. He submitted to me an S2P
file
of a measurement of a toroid, and a curve shape:
He believed this could be approximated as R/¦Ø and X/¦Ø, so I implemented
it, and managed to create the following graph:
[image: image.png]
Which seemed to fit quite well, even though the units aren't exactly the
same.
So, for now, all I know how to do is: Given a permeability chart from a
manufacturer, replicate the same curve shape vs frequency using the
NanoVNA.
I hope it's useful ;-)
--
Rune / 5Q5R
On Wed, 13 Nov 2019 at 01:22, John AE5X <ae5x@...> wrote:
Now that the capability is there in the software, how would one use
the NanoVNA to check a toroid's permeability? New territory for me...
:-)
--
*Dave - W?LEV*
*Just Let Darwin Work*
*Just Think*
-- *Dave - W?LEV* *Just Let Darwin Work* *Just Think*
|
Yes, what was your setup for the type 43 material permittivity measurement? Dave - W?LEV On Thu, Nov 14, 2019 at 10:32 PM Bob Albert via Groups.Io <bob91343= [email protected]> wrote: David, can you explain exactly how you got the curves? I would like to
do it also.
Bob
On Thursday, November 14, 2019, 02:06:06 PM PST, David F4HTQ <
f4htq@...> wrote:
Hi All,
I add some explanations.
I asked Rune if he could add this graphic because it is very useful.
It display curves that have exactly the same shape as the complex
permitivity curves (¦Ì'r and ¦Ì''r) of the ferrite datasheets.
The values do not match those of the constructor curve ( to have the right
value the software might know the exact geometry of the inductor) , but the
shape is absolutely identical.
This allow to easy identify unknown ferrite core, and to better
understand how to use it in a RF device.
For example, here is the true curve of material 43 of Fair rite.
And here's the one I got with NanoVNASaver
It works really well.
David, F4HTQ.
-----Message d'origine-----
De : [email protected] [mailto:[email protected]] De la part
de Rune Broberg
Envoy¨¦ : mercredi 13 novembre 2019 08:23
? : [email protected]
Objet : Re: [nanovna-users] NanoVNA-Saver 0.2.0
Hi John,
my experiments in this field have been very limited - the feature was
added with the encouragement of David F4HTQ. He submitted to me an S2P file
of a measurement of a toroid, and a curve shape:
He believed this could be approximated as R/¦Ø and X/¦Ø, so I implemented
it, and managed to create the following graph:
[image: image.png]
Which seemed to fit quite well, even though the units aren't exactly the
same.
So, for now, all I know how to do is: Given a permeability chart from a
manufacturer, replicate the same curve shape vs frequency using the NanoVNA.
I hope it's useful ;-)
--
Rune / 5Q5R
On Wed, 13 Nov 2019 at 01:22, John AE5X <ae5x@...> wrote:
Now that the capability is there in the software, how would one use
the NanoVNA to check a toroid's permeability? New territory for me...
:-)
-- *Dave - W?LEV* *Just Let Darwin Work* *Just Think*
|
Re: NanoVNA AURSINC v H, Q-0.4.3, images
Yes, for whatever reason you got a lower apparent reflection coefficient on the left-hand unit.
This is reflected (so to speak) in the noisier-looking phase trace.
Results with an S21 measurement of a fairly lossy DUT (say, about a 30 to 40 dB attenuator)
should be more revealing of the relative merits of the two units.
Dana (K8YUM)
|
Re: NanoVNA AURSINC v H, Q-0.4.3, images
More images, a puzzle, and some explanation...like real estate, it may be location, location, location
To begin, it's true that I was open on CH1, but the image shows that both devices were displaying only CH0.
Perhaps I should have CH1 capped at 50 O? Not sure, but will test to see what difference...
Now puzzle: I arrived back and decided to do some checks. I was surprised to see change to LOGMAG signals on H. H_Q-0.4.3_20191114_173035c.jpg
I recal, and duplicated the test, being careful to lay out the 3.5m of RG316 with no overlaps. Surprised to see H_Q-0.4.3_20191114_174614c.jpg, because now the phase had a lot of jitter.
As I was moving the unit off the desk to take a better picture, the signals cleared up. Not sure why that is so...No running electronics on desk, but the desk is covered with a dark tempered glass...it may have metal in it.
Seeing the effect of raising the H VNA from the desk, I wondered what the AURSINC unit would look like...in my original post, it was very much worse. But see AURSINC_cf_H_Q-0.4.3_20191114_174939.jpg.
I didn't recal the AURS. The phase is now cleaner, and closer to H, but there are those odd humps in LOGMAG.
I note there is a 180 degree phase difference twixt AURS and H in both my original post and this one, and don't know if that is important.
I am preparing to use this in the field, so I want to know what my expectations are. I also am trying to figure out if it is possible to put this at the mid-point of a 130 ft. plus dipole fed by plastic window "ladder line" to measure feed point impedance vs frequency and how it varies as we pull up the antenna from ground level to full height. The alternative is to cal to the end of the ladder line, but I don't know how that will work...to new to VNA.
I also plan to test identical configurations using a laptop|USB and a mobile|tablet|USB to see how data gathering this way affects the displayed data.
--
73 de Rich NE1EE
On the banks of the Piscataqua
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DL8AAP Carsten
Rich NE1EE
Dick
chuckt
Kurt Poulsen
