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Re: New H4 Model Received from R & L Electronics

 

Clock 32.768 kHz quartz need if you wont get correct time on filenames and file creation time. Need only install it as on foto.
If not install it, no big problems

RTC_clock_osc.jpg
NanoVNA-H4 SD Slot.jpg
slot.jpg
tf-card.jpg

Re: New H4 Model Received from R & L Electronics

 

Hello again all; Thanks for the info on saving image files from NanoVNA Saver.

I'm not sure I'm ready to go inside for the SD card mod yet, but in trying to understand it. It looks like the connections for the SD card holder are already on the H4 PCB, which would be easy to add, but I do not understand about the crystal?? Do you have to replace the clock crystal on the PCB or what??

73, John, K9KA
Re: NanoVNA-saver and Windows 10 #nanovna-h4 #nanovna-saver

 

On Sat, Jun 13, 2020 at 11:43 PM, Milo? Soukup wrote:

The Nano VNA App works fine on my cellphone (Android - Huawei Mate 10 Pro). I am serching for something I could use on my notebook (Win 10 64-bit Czech version, 8GB RAM).

I tried to connect my Nano VNA H4 to my PC with the supplied cable and I tried another USB-A to USB-C cable also. The result is always the same: Device successfully installed as COM4 and "cho45" cannot find it.
----------------------------------------------------------
Milo?
On your Win 10 64-bit I would suggest running one of the PC applications instead of the "cho45" web application. I consider Rune's NanoVNA-Saver to be the best choice but other user's have their own favorites. These are the ones that I know of:

1. NanoVNA-Saver, currently ver 2.2, .
2. NanoVNASharp v3.0, .
3. nanoVNA Partner, .
4. TAPR VNAR4.6, /g/nanovna-users/files/NanoVNA%20PC%20Software/TAPR%20VNA/VNAR4.6.zip .

All the above applications are described on this group's Wiki page at /g/nanovna-users/wiki#Software . Recently RigExpert has released a PC software that supports the NanoVNA but not many users have been able to get it to run on the -H4.

- Herb
Re: NanoVNA-saver and Windows 10 #nanovna-h4 #nanovna-saver

 

Hello Herb,



Thank you for you quick answer.




The Nano VNA App works fine on my cellphone (Android - Huawei Mate 10 Pro).
I am serching for something I could use on my notebook (Win 10 64-bit Czech
version, 8GB RAM).

I tried to connect my Nano VNA H4 to my PC with the supplied cable and I
tried another USB-A to USB-C cable also.
The result is always the same: Device successfully installed as COM4 and
"cho45" cannot find it.




Thank you, Milo?

?
---------- P?vodní e-mail ----------
Od: hwalker <herbwalker2476@...>
Komu: [email protected]
Datum: 14. 6. 2020 1:32:32
P?edmět: Re: [nanovna-users] NanoVNA-saver and Windows 10 #nanovna-h4 #
nanovna-saver
"On Sat, Jun 13, 2020 at 02:26 PM, Milo? Soukup wrote:

Hi Herb, what can I do if the "cho45" does not find my NanoVNA-H4? The
device is successfully installed as COM4 - code 0x0. The web app says "no
compatible
devices found". I use Win 10 64-bit and the last Chrome. thx
=========================================
Milo?,
I would try the following:

1. If you are not using an OTG cable connected to your NanoVNA-H4, try that.

2. Try using the NanoVNA App from the Goggle App Store and see if it works
for you instead of the web app.
3. Try using your cellphone (with OTG cable) to connect to the NanoVNA-H4
using the web app or the Goggle App Store apk.
4. Try another USB-C to USB_A cable.

Hopefully, one of the above will work. If not, I suggest you run NanoVNA-
Saver on Win 10.

- Herb



"
Re: NanoVNA-saver and Windows 10 #nanovna-h4 #nanovna-saver

 

On Sat, Jun 13, 2020 at 02:26 PM, Milo? Soukup wrote:

Hi Herb, what can I do if the "cho45" does not find my NanoVNA-H4? The device is successfully installed as COM4 - code 0x0. The web app says "no compatible
devices found". I use Win 10 64-bit and the last Chrome. thx
=========================================
Milo?,
I would try the following:

1. If you are not using an OTG cable connected to your NanoVNA-H4, try that.
2. Try using the NanoVNA App from the Goggle App Store and see if it works for you instead of the web app.
3. Try using your cellphone (with OTG cable) to connect to the NanoVNA-H4 using the web app or the Goggle App Store apk.
4. Try another USB-C to USB_A cable.

Hopefully, one of the above will work. If not, I suggest you run NanoVNA-Saver on Win 10.

- Herb
Re: NanoVNA-saver and Windows 10 #nanovna-h4 #nanovna-saver

 

Hi Herb, what can I do if the "cho45" does not find my NanoVNA-H4? The device is successfully installed as COM4 - code 0x0. The web app says "no compatible devices found". I use Win 10 64-bit and the last Chrome. thx
Re: Calibration kit modeling with nanoVNA possible? #calibration #linux #octave

 

On Sat, Jun 13, 2020 at 06:14 PM, Reginald Beardsley wrote:

I've been considering using a basis pursuit to determine the parameters. Not
done anything more than look closely at the math. It's an underdetermined
problem, but basis pursuit can handle that very well using GLPK if one has an
accurate dictionary of simulations for the ranges of values spanning the true
values.

I just ordered an H4, so when that arrives I'll have a good excuse for playing
with the Octave solution.
Hello Reg,
Thank you ver much taking care about my topic VNA calibration improvement.
I am a newcomer in that field, so it would be nice to help,
if that Octave program *calkit_model.m* could help to improve the calibration of the nanoVNA.
73, Rudi DL5FA
Re: Possible adjunct to 2.8" NanoVNA for outdoor use - LCD viewfinder

 

Thank you, Oristo and DJ7BA ---

I discovered the small metal shim or bezel at the bottom of the viewfinder shipping box this morning before I read your posting (did not realize that the shim was included, or that the viewfinder used magnetic mounting).

The shim or bezel has four thin adhesive areas used to attach the shim to the camera body. I slightly trimmed the shim at one corner (it had slightly enlarged outline, perhaps to help camera owner to position the shim, but in this case the enlarged outline interferes with one of the four nanovna screws), then pressed the shim onto the front of the nanovna.

The shim does not adhere very well to the front of the nanovna; perhaps because of the material or paint used on the front layer of the nanovna package, or I impaired the shim flatness after trimming the corner, so after I attached then removed the viewfinder (the magnetic attraction between the viewfinder and the shim is quite strong and magnetic attachment would be a good solution to problem #3), the shim separated from the nanovna and remained attached to the viewfinder magnets.

The presence of the shim (it is ~1mm thickness, adding to the distance between the LCD display and the viewfinder lens) did not seem to change the image focus enough to notice - it was still slightly out of focus (with chromatic aberation), but perfectly usable. I would be happy to use it.

Considering the intended fit of the viewfinder and the very good fit otherwise to the nanovna, perhaps the nanovna 2.8" display was originally used in digital camera manufacture...

I think a more useful solution would be a replacement nanovna 2.8" front panel made from thin steel rather than FR4, but with same opening and same mounting holes. This would allow the viewfinder to directly attach to the nanovna front using the in-built magnets. It is probably required to use commercial manufacturing to make a steel front panel, so I do not think I will be able to proceed further, but I will investigate improved attachment of the viewfinder for my nanovna.

DJ7BA - I did find other listings of this type of item on ebay, some lower price maybe USD 6 with (slow) shipping. There seems to be some variations depending on camera type. My device was labeled on box as type "V1", type AY014, for Canon 5DII/7D/500D and Nikon D700/D800". I have no such cameras, so I did not consider the possible differences.

Thank you again,

Dave
Re: Calibration kit modeling with nanoVNA possible? #calibration #linux #octave

 

I've been considering using a basis pursuit to determine the parameters. Not done anything more than look closely at the math. It's an underdetermined problem, but basis pursuit can handle that very well using GLPK if one has an accurate dictionary of simulations for the ranges of values spanning the true values.

I was getting less than 1% errors inverting the heat equation for fluid flow in porous media to determine layer thicknesses above and below a horizontal crack. In that case the flow is the sum of two flows, both of which are infinite series of exponentials.

I just ordered an H4, so when that arrives I'll have a good excuse for playing with the Octave solution.

Have Fun!
Reg
Re: New H4 Model Received from R & L Electronics

 

Thanks for posting about this. I'd not been aware the H4 had come to market. I just bought one from R&L whom I'd never heard of before. I already have the cheap 2.8" black clone, but the H4 is too nice not to have one. Though it could be said I have a ridiculous number of VNAs now, VNWA, xaVNA, 8753B and 8510C in addition to soon two nanoVNAs.

Have Fun!
Reg
Re: New H4 Model Received from R & L Electronics

 

If you install SD card slot in H4 (and use new firmware, it still beta, but stable) possible save screenshots and Touchstone files on SD, and after open it on PC
Beta Firmware is here
/g/nanovna-users/message/13941

How it look
/g/nanovna-users/message/13744
Installed quartz
/g/nanovna-users/message/13937
Re: New H4 Model Received from R & L Electronics

 

I am looking for a way to either plot Touchstone files or print curves from the NanoVNA directly.
gnuplot
/g/nanovna-users/message/5313
/g/nanovna-users/message/6186

Using bash with paste to concatenate columns for gnuplot:
/g/nanovna-users/message/5679
Re: Possible adjunct to 2.8" NanoVNA for outdoor use - LCD viewfinder

 

There's no immediately obvious way to fix the viewfinder to the NanoVNA
mine included a thin steel frame with pressure-sensitive adhesive
that attracts viewfinder's magnets
Re: RigExpert's PC software now Supports NanoVNA and is Open Source #consolecommands #measurement #applications

 

Sorry, OH2EC antenna, not as above.
Could not edit the previous post.
Re: RigExpert's PC software now Supports NanoVNA and is Open Source #consolecommands #measurement #applications

 

Unless you use the nanovna-saver software and multiply the 101 points by N
segments, having even more detailed information than the AA-600.

Calibration via nanovna-saver from 50Hz to 30Mhz 101 points X 30 segments =
3030 points = 9.9kHz/step

(I have an improved version of the W3DZZ, the OH2ECH antenna, and I love
it!)

[image: image.png]




*73 de Luís, CT2FZI*


<>

On Sat, 13 Jun 2020 at 09:57, DJ7BA <dj7ba@...> wrote:

Hi Dave,

no, not really.

What I meant saying:

I never needed to recalibrate the AA-600 between ham bands. That's
what I miss most with the NanoVNA.
(And that is exactly on the topic (NanoVNA and Antennascope software
working well together:)

The RigExpert is calibrated at it's N connector plane, once and (almost)
forever but nowhere else.
That is the only cal plane I need. Calibration with a huge number of cal
points (I don't know the exact number
at present, though) covers the full 600 MHz range at close enough spacing.
So no recal is needed, except for aging reasons, perhaps.


A practical example:

I measured my antenna (i.e. a narrow banded W3DZZ on 80m) at the rig side
coax cable end in the shack.

The RigExpert Antennascope (1.0 and 2.0) software permits saving that in
an .s1p file that I can use in SimSmith,
that allowed me to obtain the exact feedpoint .s1p (sweep impedance) data
file.

No need to:

1. leave the shack for terminating the coax at the (hard to reach) antenna
feedpoint,
2. go back to the shack and calibrate the RigExpert for that
(one-antenna-unique) cable length feedpoint plane,
3. go back to the feedpoint and reconnect the antenna,
4. go back to the shack to obtain the feedpoint impedance sweep data.

Instead, with that easily measured and calculated feedpoint sweep
impedance file I could cut my cable
length and use an LC tuner such that I now have much better than before,
and now also flat, SWR across 3.5 ... 3.8 MHz without retuning. A big
improvement.

This could also have been done with the NanoVNA - but for o n e b a n
d o n l y because of the small
number of 101 only cal points.

After recal for any next band, the same procedure would have been needed
again with the NanoVNA.

Instead:

On the AA-600, all calibration is (almost) once only:

1. for all frequencies 1 ... 600 MHz
2. at the RigExpert's N connector plane. No other plane is needed.

That is why that calibration can stay for all my needs on all (in my case
below 30 MHz) bands.

There is no need to recalibrate the RigExpert - except for aging reasons.
The manufacturer's cal can
stay in many practical ham cases for all uses. Probably to start with,
that is better that what many can calibrate.

Needless to say, that in my (below 30 MHz) case the N socket's precision
is not of major concern.
It's ruggedness, however, is. Neither my MFJ-259 nor my NanoVNA has such
rugged, long lasting connection.

This is why I love my AA-600 most of my three analyzers.

73, Hans
DJ7BA







-----Ursprüngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von Dr.
David Kirkby, Kirkby Microwave Ltd
Gesendet: Freitag, 12. Juni 2020 19:25
An: [email protected]
Betreff: Re: [nanovna-users] RigExpert's PC software now Supports NanoVNA
and is Open Source #applications #consolecommands #measurement

On Fri, 12 Jun 2020 at 17:48, DJ7BA <dj7ba@...> wrote:


I never needed to recalibrate the AA-600 between ham bands. That's
what I miss most with the NanoVNA.


73, Hans
DJ7BA

You can not avoid the need to calibrate virtually any VNA (RigExpert,
NanoVNA, Keysight etc) if you wish to measure the actual complex impedance
of an antenna because the impedance is changed dramatically by the
connecting cable.

If you only measure at the cable in the shack, then you are not getting as
much information as you can. It is only being used like an SWR meter.

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




--
Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft.





image.png

Re: Possible adjunct to 2.8" NanoVNA for outdoor use - LCD viewfinder

 

Nice discovery. Thank you. I ordered one.
Some 9 US $ only, but it has a long delivery time, though.

-----Ursprüngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von David Feldman via groups.io
Gesendet: Samstag, 13. Juni 2020 03:43
An: [email protected]
Betreff: [nanovna-users] Possible adjunct to 2.8" NanoVNA for outdoor use - LCD viewfinder

My friend Rich K0ZX has been using his NanoVNA (original type) outdoors, and asked me about options for improving display visibility. I went searching for possible solutions and ran into a low-cost camera viewfinder accessory (some digital cameras also have ~2.8" LCD display, and are subject to the same visibility impairments when used outdoors.)

A few weeks ago I ordered on ebay the 2.8" LCD viewfinder listed below (now about USD 12; they seem common on ebay and I'm sure there are alternatives to consider...)



It arrived after about a month, and after popping out (inverting) the rubber material eye cup (it's shipped in a backwards configuration reduce size of shipping container) and placing it on my (very much original-era NanoVNA), it does indeed somewhat magnify the display and shield it from ambient light.

A few of caveats:

1. The touchscreen is obviously not accessible while the viewfinder is in place, and my nanovna is pure original vintage, no updates, so the manual button/switch controls leave more than a little to be desired;

2. The focus isn't quite perfect - it seems that it the small gap between the LCD plane and the viewfinder focus point caused by the PC board material takes the viewfinder slightly out of focus, but it's still quite readable, nonetheless;

3. There's no immediately obvious way to fix the viewfinder to the NanoVNA.

In any event, I wanted to pass this along to our user hhcommunity to see if it inspires any further ideas.

A few photos are attached. Please excuse the up/down inverted photos (photography hasn't been my thing since about 1962!)

Comments and observations welcomed!

73 Dave WB0GAZ wb0gaz@...





--
Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft.
Re: RigExpert's PC software now Supports NanoVNA and is Open Source #consolecommands #measurement #applications

 

Hi Dave,

no, not really.

What I meant saying:

I never needed to recalibrate the AA-600 between ham bands. That's
what I miss most with the NanoVNA.
(And that is exactly on the topic (NanoVNA and Antennascope software working well together:)

The RigExpert is calibrated at it's N connector plane, once and (almost) forever but nowhere else.
That is the only cal plane I need. Calibration with a huge number of cal points (I don't know the exact number
at present, though) covers the full 600 MHz range at close enough spacing. So no recal is needed, except for aging reasons, perhaps.


A practical example:

I measured my antenna (i.e. a narrow banded W3DZZ on 80m) at the rig side coax cable end in the shack.

The RigExpert Antennascope (1.0 and 2.0) software permits saving that in an .s1p file that I can use in SimSmith,
that allowed me to obtain the exact feedpoint .s1p (sweep impedance) data file.

No need to:

1. leave the shack for terminating the coax at the (hard to reach) antenna feedpoint,
2. go back to the shack and calibrate the RigExpert for that (one-antenna-unique) cable length feedpoint plane,
3. go back to the feedpoint and reconnect the antenna,
4. go back to the shack to obtain the feedpoint impedance sweep data.

Instead, with that easily measured and calculated feedpoint sweep impedance file I could cut my cable
length and use an LC tuner such that I now have much better than before, and now also flat, SWR across 3.5 ... 3.8 MHz without retuning. A big improvement.

This could also have been done with the NanoVNA - but for o n e b a n d o n l y because of the small
number of 101 only cal points.

After recal for any next band, the same procedure would have been needed again with the NanoVNA.

Instead:

On the AA-600, all calibration is (almost) once only:

1. for all frequencies 1 ... 600 MHz
2. at the RigExpert's N connector plane. No other plane is needed.

That is why that calibration can stay for all my needs on all (in my case below 30 MHz) bands.

There is no need to recalibrate the RigExpert - except for aging reasons. The manufacturer's cal can
stay in many practical ham cases for all uses. Probably to start with, that is better that what many can calibrate.

Needless to say, that in my (below 30 MHz) case the N socket's precision is not of major concern.
It's ruggedness, however, is. Neither my MFJ-259 nor my NanoVNA has such rugged, long lasting connection.

This is why I love my AA-600 most of my three analyzers.

73, Hans
DJ7BA







-----Ursprüngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von Dr. David Kirkby, Kirkby Microwave Ltd
Gesendet: Freitag, 12. Juni 2020 19:25
An: [email protected]
Betreff: Re: [nanovna-users] RigExpert's PC software now Supports NanoVNA and is Open Source #applications #consolecommands #measurement

On Fri, 12 Jun 2020 at 17:48, DJ7BA <dj7ba@...> wrote:


I never needed to recalibrate the AA-600 between ham bands. That's
what I miss most with the NanoVNA.


73, Hans
DJ7BA

You can not avoid the need to calibrate virtually any VNA (RigExpert, NanoVNA, Keysight etc) if you wish to measure the actual complex impedance of an antenna because the impedance is changed dramatically by the connecting cable.

If you only measure at the cable in the shack, then you are not getting as much information as you can. It is only being used like an SWR meter.

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




--
Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft.
Re: RigExpert's PC software now Supports NanoVNA and is Open Source #consolecommands #measurement #applications

 

Now i can answer why AntScope2 not detect NanoVNA-F, and new firmwares of NanoVNA-H or NanoVNA-H4

It ask 'info' and try find this string in answer
Board: BOARD_NAME
But last firmwaers and NanoVNA-F (i think so, i not have NanoVNA-F) answer
BOARD_NAME
At first string

At this moment AntScope2 stop

If add to info answer in first string
Board: BOARD_NAME
All work (data get from NanoVNA-H4 and NanoVNA-H), but still not good (Continues run not work)
Re: RigExpert's PC software now Supports NanoVNA and is Open Source #consolecommands #measurement #applications

 

Hi DiSlord,

Same here, just the 1st dialog between NanoVNA and AntScope2 i've read with a serial analyzer.

Returned info is correct but nothing after that !

Regards,

Rudi

Le 12.06.2020 à 19:36, DiSlord a écrit?:
I try launch AntScope2 vs my nanoVNA H and NanoVNA H4
I think i know why int not work

AntScope2 send 'info' command
And then nothing to do, so i think problem in parse NanoVNA answer, it depend from model and firmware

I hope this help
Re: Possible adjunct to 2.8" NanoVNA for outdoor use - LCD viewfinder

 

With respect to the viewer focus. Have you tried it on any other display like a smart phone, TV or computer display; from what looks like a very cheap lens, it might be what you see is what you get. If other displays look more in focus, then you could try sanding down the viewer a bit to account for the extra space caused by the case.

Another possible solution might be to use it with a smart phone where the display can be set brighter and would probably be bigger as well. I am new here, but tried "NanoVNA WebApp" on my Samsung Android today, not sure if there are others or if there is one for iPhones.
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