开云体育

Hi Ady

regarding saving the scan and download it later, I think a nice firmware
feature would be to schedule a delayed scan followed by a pause after the
scan.

This is already possible using

This will allow to hang the NanoVNA to the antenna (for example HF multiband
dipole like FD4, or VHF YAGI) and perform a scan without the feeder.
The delayed start of the scan is necessary to allow enough time to install the
antenna in the position.

Not sure why delaying start is necessary; scans until pause are discarded.
Only the final scan before pause is available to upload when USB is reconnected.

G=m/s

The results of this exercise appear to confirm your conclusion in that paper.
I am amazed by how close they agree with those of the full one-port cal and
that of your mini-equation.

That works when short and open results are similar and load signal is small.
Small load signal is generally easy for resistance bridge at low frequencies,
not so much for reflection bridge and higher frequencies.

Open = short works better for nearly no distance from bridge to DUT,
not so well for real cables of some length.

Hi Kurt -

When the calibration kit is loaded in VNWA software
simply open a custom trace and in the Expression line
write s_load or s_open or s_short or s_thrumatch or s_thru
then the trace is shown according for the custom trace
then to save directly as s1p file by a right click on the trace
and use the "Export to s1p file" function.
You must decide on frequency span and number of points in advance

.. and another piece of the puzzle falls into place..
Thanks ever so much!

The very "short" one port equation does get meaningfully close, but diverges with frequency. I haven't computed the impedance deviation yet, so it's too soon to pass judgement. My spreadsheet is getting uncomfortably out of control; and as I am understanding more, it expanded and has become difficult to manage. Before I continue from here, I need to do a refresh/rewrite to get it better organized and to keep it from becoming corrupted. This may take a few days.

--
73

Gary, N3GO

thank you,

I made a mistake during calibration, now the reading is good, have a good day

Gilles

Hi Gilles,

I assume you followed a calibration routine as documented. There is one in the file directory. See

/g/nanovna-users/files/NanoVNA%20Calibration%20Considerations%20and%20Procedure_v1.1.pdf

or there are various messages and threads documenting similar approaches. I agree after the cal routine is complete using the standards used in the cal, the thru corrected should read essentially 0 dB.

Alan

hi,
When I am doing a full calibrate O S L iso and thru. I get a -10.8 dB on log mag with the RG174 coax cable. on full RF span exemple: 28 to 30MHz or other frequencies range. channel select is thru...

I don't understand why, I should get around 0dB of attenuation
I have tested a VHF cavity and also a 11 db of attenuation (I should get around 1db att)

any could help

thanks

Gilles

Rune,

While you are at it is there any way to integrate an option so that the
cursor data can be displayed in the appropriate graph display area similar
to the data that you see on the real VNA display. I you need to display all
of the data details you can of course use the display data button but of
course this greatly expands the display area requiring the vertical scroll
bars to be used.

73,
Sam

ARS W3OHM
Owner and Moderator of:
LeCroy Owners Group on Groups.io (Current and Future Group)
LeCroy_Owners_Group on Yahoo! Groups (NOW DEAD Legacy Group)

GIN & PEZ@arg;

New results to please you all the more. I just replaced your mini equation:



with your even smaller equation as presented in Part 3 of your 5 part series as equation (6):

Measurement Uncertainty in Network Analyzers: Differential Error
Analysis of Error Models Part 3: Short One-Port Calibration - Comparison:


Which reduces the equation to a single calibration measurement (Short) only, and reduces the computation to simply:

G=m/s

The results of this exercise appear to confirm your conclusion in that paper. I am amazed by how close they agree with those of the full one-port cal and that of your mini-equation.

I will gather and post more detail on my observations tomorrow.

--
73

Gary, N3GO

I'm using a Dell laptop at 1366x768, font size 8, 16:9 aspect ratio, Windows 10. I haven't had problems with the scrollbars being present or overlaying the taskbar since before nanovna-saver version 0.1.3 (see attachment).

Herb

GIN & PEZ@arg;

Excellent news to hear.

Have you done any recent IEEE publication or presentations of the work you are presenting here, or have plans for presenting at any Conferences?

--
73

Gary, N3GO

Sam,
Have a look at Classic Shell for your windows OS. It makes the start menus look like win7 and works quite well with the current win10 update.?
... Larry



On Sun, 3 Nov 2019 at 4:41 PM, Rune Broberg<mihtjel@...> wrote: Hi Sam,
I think maybe the Windows 10 task bar is a few pixels more than the Windows
7 one?

I'll try to see if I can find a few pixels in the interface so it will fit
- it should be possible :-) It probably won't be for the next release,
though, as this is almost ready.

--
Rune / 5Q5R

Hi Ady,
That is why for version 2 hardware, folks are asking for Bluetooth or wifi control of the unit.?

... Larry


On Sun, 3 Nov 2019 at 3:48 PM, Ady, YO2NAA<yo2naa@...> wrote: Hi all,

regarding saving the scan and download it later, I think a nice firmware feature would be to schedule a delayed scan followed by a pause after the scan.
This will allow to hang the NanoVNA to the antenna (for example HF multiband dipole like FD4, or VHF YAGI) and perform a scan without the feeder.
The delayed start of the scan is necessary to allow enough time to install the antenna in the position.

Thank you,
Ady (YO2NAA)

Hi Sam,
I think maybe the Windows 10 task bar is a few pixels more than the Windows
7 one?

I'll try to see if I can find a few pixels in the interface so it will fit
- it should be possible :-) It probably won't be for the next release,
though, as this is almost ready.

--
Rune / 5Q5R

#71: Good News : (1) DEP was Restored and Maxima is still Working in these 2 cases :
[WXP64P&SP2] and [W7P64], (2) Maxima Worked Immediately in [W8.1P64]

@Oristo - 2 November 2019 : /g/nanovna-users/message/6348
@Gary O'Neil - 2 November 2019 : /g/nanovna-users/message/6338
@Gary O'Neil - 3 November 2019 : /g/nanovna-users/message/6360

Hello,

We thank you very much both of you for your valuable comments !

Because, it was only after your remarks on the installation and run on your [W10]
without DEP problems of:

maxima-clisp-sbcl-5.43.0-win64.exe

that we motivated to return on this subject and thus to check and confirm -with much
pleasure, indeed- the following:

(1) Yes, indeed, Maxima was also installed and ran immediately, without any further
problems, under [W8.1P64] at our multi-boot PC with AMD CPU.

(2) The DEP Protection was restored in both cases:

I/II [W7P64] :

=> wmic OS Get DataExecutionPrevention_SupportPolicy
<= DataExecutionPrevention_SupportPolicy
<= 0

=> BCDEDIT /SET {CURRENT} NX OPTIN

=> Restart

=> wmic OS Get DataExecutionPrevention_SupportPolicy
<= DataExecutionPrevention_SupportPolicy
<= 2

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

II/II [WXP64P&SP2] :

=> wmic OS Get DataExecutionPrevention_SupportPolicy
<= DataExecutionPrevention_SupportPolicy
<= 0

Remove the switch:

/NOEXECUTE=ALWAYSOFF

Restart

=> wmic OS Get DataExecutionPrevention_SupportPolicy
<= DataExecutionPrevention_SupportPolicy
<= 2

(3) Maxima works with either Lisp CLISP 2.49 (2010-07-07) or Lisp SBCL 1.4.14,
as follows:

CLISP:
OK : WXP64P&SP2
OK : W7P64
OK : W8.1P64

SBCL:
OK : WXP64P&SP2
NO : W7P64
OK : W8.1P64

(4) In all 3 cases, we allow in our Firewall the incoming network connections for the
[Wish] Application:

X:\maxima-5.43.0\bin\wish86.exe

(5) More on all that you can find at the very same named thread at Maxima-Discuss:



Sincerely,

gin&pez@arg

:71#

Hello again Rune,

Once I figured out how to hide the taskbar (face palm!) it fits. It would
be nice of it would fit without hiding the taskbar though.
73,

Sam Reaves
ARS W3OHM
Owner and Moderator of:
LeCroy Owners Group on Groups.io (Current and Future Group)

Hi Rune,
I am using Windows 10 on a HP15 f162dX 15" screen 16:9 aspect ratio laptop.
Data is here:


I like is because it's a Intel I3 is lightweight and has a nice display. I
picked it up at a ham swap meet dirt cheap a couple of years ago. They
still make it along with several derivatives.

Sam Reaves
ARS W3OHM
Owner and Moderator of:
LeCroy Owners Group on Groups.io (Current and Future Group)
LeCroy_Owners_Group on Yahoo! Groups (NOW DEAD Legacy Group)

The calibration routines start at line 1034


--
Erik, PD0EK

Got bitten too it seems. Hopefully I can get a refund via Mastercard. I
think this may be protected. As for the scammer, pillory.

I was fortunate enough to get some high-quality PTFE (Teflon) coax (RG-174 sized) SMA to BNC jumpers - and these hold up much better, probably because they have a small piece of heat-shrinkable tubing at the interface between the connector and the cable which distributes stress over a larger area. "Heavy" use of these good cables does eventually fatigue the shield or center conductor and make them unreliable - but they are still quite rugged.

If I could, I would put more heat-shrinkable tubing on them, but this is difficult with the already-attached connectors. One thing that I have done on cables like this is to put a shaped blob of "Shoe Goop" or equivalent adhesive to form a flexible "boot" at the transition point: A bit uglier than heat-shrink tubing, but similar in effectiveness in de-stressing the cable at that point.

73,
Clint
KA7OEI