开云体育

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

This is how I am driving the Mag loop

Hello,

I am looking for any references that explain the formulas used by the NanoVNA to do calibration and measurement corrections. I have looked at various six- and twelve- parameter corrections. Does the NanoVNA use these methods? I have looked at the DG8SAQ documentation and then derived my own method based on that. I am curious to how the calibration on the NanoVNA will be affected by various fixtures.

73,
Dan
KW4TI

Hi
I used the following approach with my mag loops.
Capacitor is driven by a stepper motor controlled remotely (Arduino + Nrf24l01 module)
When I decide to have a QSO session, I first run a calibration.
I move automatically from begin to end of the relevant band by small steps and each time measure the resonance frequ (S11 dip)
At the end I get an x,y table where x are the resonance frequencies, and y the corresponding stepper positions.
I then compute the table to obtain the function stepper pos= f(frequency) (Polynomial interpolation)
All above is carried out automatically (Python script running on a headless Raspberry PI including a Web Interface)
In this way I can move very fast within the band without having to tune each time.
(frequency is read via CAT interface and stepper is then moved to the new position)
Currently developing a solution for the Ciro Mazzoni loop which is driven by a linear piston.
Positioning of the piston will be done by means of a fix rotary encoder (600 counts/360°) driven by a small 3d printed rack.....
Will soon share some pictures!
73 de HB9IIU

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)

Check out the ModularTuner



This is an automatic antenna tuner with a directional coupler that you
could program to search for the minimum SWR. It can be easily integrated
into an antenna system as the directional coupler is placed in-line and you
can have the microcontroller switch relay units that adjust inductors or
capacitors, for example. The two modules you would need are the
DirectionalCoupler and the Controller. The controller measures the
amplitude and phase of the reflection coefficient.

73,
Dan
KW4TI

As a first step I will model the reference Z0 ( normally 50 ohm ) as a RLC combination
If that is not enough I will add some unbalance to the moebius transform.
--
Erik, PD0EK

Ian,

try: python -m pip install --user --upgrade pip
and next PyQT5 install
I hope help

Gyula, HA3HZ

Hi Oristo

When the cal kit calibration kit is loaded in the VNWA software you 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 to be shown as you like in Smith, dB of what ever representation and 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

Simpe as that ?

Kind regards

Kurt

Fra: [email protected] <[email protected]> P? vegne af Oristo
Sendt: 3. november 2019 20:42
Til: [email protected]
Emne: Re: [nanovna-users] Chasing ghosts??? #internals #calibration

Thanks for the links.!

One problem is that scikit-rf wants S11 files for ideal SOL but I did not find how scikit-rf can generate S11 from e.g. delay, R, L, C values.



Since I have SDR-Kits BNC cal kit,

perhaps S11 for those can be generated using VNWA software, but scikit-rf also seemingly does no interpolation; raw measurement frequencies must match ideal S11, so that will be another challenge.