开云体育

I would like to have the option of controlling my VNA via a smartphone or a tablet.
I believe this is the way the industry is going for portable instrumentation.
I saw two examples this summer.
The Army Corps of Engineers is surveying the beaches here in New Jersey for coastal erosion. The GPS receiver is mounted on a pole with the antenna on top and the data was collected on a tablet. This remote interface was handy because the receiver mounted on the pole had to be placed in the surf.
I had a service call with Comcast to replace a faulty cable box. The tech used a test set which was controlled and monitored with his smartphone. He used it to check signal levels at various points, some with were tight and he could analyze in a comfortable position instead of crouching down.
The MetroVNA and Sark VNA have bluetooth, it shoulc be included in the next version of nanaVNA.

Mike N2MS

Hi

I have tried the nanoVNA_800_aa_20190802.dfu F/W too. The trace is the same as the NanoVNA-H__800_ch_20190924.dfu.

I strongly believe that when approaching 300 MHz, with the fundamental frequency, the NanoVNA doesn't work properly which the below spectrum plots also show. Is there a F/W that goes to e.g. 266 2/3 MHz and then has a max of 800 MHz, or 250 MHz/750 MHz...? If so I would love to try it.

Unfortunately I can't use the 8753 these days - maybe next week. But, I have measured the LPF using my signal generator and spectrum analyzer, and there is no abrupt change in the attenuation.

Bo

I know

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Dr. David Kirkby from Kirkby Microwave Ltd
Sendt: 30. september 2019 15:26
Til: [email protected]
Emne: Re: [nanovna-users] New document

On Mon, 30 Sep 2019 at 14:09, Kurt Poulsen <kurt@...> wrote:

Hi Again Erik

This time by creating a new mail I succeded

basic knowledge about a transmission line.pdf


No, that failed

I know some might argue filenames are less readable, but if you use underscores or hyphens rather than spaces, you will never have this problem.

Kind regards

Kurt

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

Hi Jeff

All my (I think more than 100) are in the folder ..../VNWA/ not accessible as such

I have an old promise to create a list but I am continuously on a new job about calibration so it will come some time when

And by the way my homepage suffers serious of age too

the steam pressure has lowered ?

Kind regards

Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Jeff Anderson
Sendt: 30. september 2019 15:15
Til: [email protected]
Emne: Re: [nanovna-users] Cal-Kit Standards' Definitions



On Mon, Sep 30, 2019 at 05:57 AM, Kurt Poulsen wrote:

Here is another handy document of general interest

<> basic knowledge about a transmission

line.pdf I still have a problem to create it as html Hm....

Hi Kurt,



Here's the link (I hope!): <>



By the way, if I go to your top page, <> , I don't see this PDF listed in the contents. Did I miss it?



- Jeff, k6jca

Hi Erik

My Outlook 2019 sucks ?

Kind regards

Kurt



-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af erik@...
Sendt: 30. september 2019 15:14
Til: [email protected]
Emne: Re: [nanovna-users] Cal-Kit Standards' Definitions



On Mon, Sep 30, 2019 at 05:57 AM, Kurt Poulsen wrote:

<> basic knowledge about a transmission line.pdf

<>



Interesting example on how to get rid of the remaining osculation due to fringe C/L of the calibration load

Dear gin&pez,

Thank you very much for taking the time to reply to my questions.

I must apologize -- it is clear that my questions were too vague. I hope you will allow me to ask them in a clearer fashion.

To improve my understanding "facupov", I would like to understand:

1. For the Open and Short standards, in what terms (or parameters) do you define each standard's two uncertainties?

(I will note that Keysight (formally Agilent, formally Hewlett-Packard) defines the Open and Short uncertainties each in terms of a single parameter: angle of the Reflection Coefficient. How are your two parameters of uncertainty related to the manufacturer's definition of uncertainty in terms of a single parameter, Reflection Coefficient angle?)

2. For the Load standard, in what terms (or parameters) do you define its single uncertainty?

(I will note that Keysight defines its Load-standard uncertainties in terms of rho (rho being defined as the magnitude of the Reflection Coefficient). Therefore, the range of possible values for the Load can be pictured on a Smith Chart as being those values whose Reflection Coefficients are bounded by a circle, centered at 0,0, whose radius is rho. And so I would think that a Load would have two uncertainties, defined in terms of the magnitude and the angle of its Reflection Coefficient, rather than a single parameter of uncertainty.)

I hope my questions help you to understand why I am confused. Thank you again for taking the time to reply. I very much appreciate your efforts.

Best regards,

- Jeff, k6jca

Here is another handy document of general interest

Added to Wiki: /g/nanovna-users/wiki/Application-Notes

On Mon, 30 Sep 2019 at 14:09, Kurt Poulsen <kurt@...> wrote:

Hi Again Erik

This time by creating a new mail I succeded

basic knowledge about a transmission line.pdf


No, that failed

I know some might argue filenames are less readable, but if you use
underscores or hyphens rather than spaces, you will never have this
problem.

Kind regards

Kurt

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

Your email program seems to enforce a max line length cutting the url in two

If you copy the url directly from the browser it may work (if not too long)
Erik.

On Mon, Sep 30, 2019 at 05:57 AM, Kurt Poulsen wrote:

Here is another handy document of general interest
basic knowledge about a transmission line.pdf
I still have a problem to create it as html Hm....

Hi Kurt,

Here's the link (I hope!):

By the way, if I go to your top page, , I don't see this PDF listed in the contents. Did I miss it?

- Jeff, k6jca

On Mon, Sep 30, 2019 at 05:57 AM, Kurt Poulsen wrote:

basic knowledge about a transmission line.pdf

Interesting example on how to get rid of the remaining osculation due to fringe C/L of the calibration load

On Mon, Sep 30, 2019 at 06:47 PM, Gyula Molnar wrote:

Hi neb,

TDR is work well.

Hi,

It is nice to know that you made it work.

neb

Hi Again Erik

This time by creating a new mail I succeded

basic knowledge about a transmission line.pdf
<
on%20line.pdf>

Kind regards

Kurt

On Mon, 30 Sep 2019 at 13:46, Kurt Poulsen <kurt@...> wrote:

Hi Oristo
Thank you for your lingual suggestions
I have printed your input for picking up any more suggestions.
Kind regards
Kurt

Kurt,
it might be worth creating a fake Touchstone file with an exponentially
decaying amplitude, “modulated” with a sine wave - I *think* that would
produce the right result. If you exaggerated the problem with a bit of fake
data, it would be easier to see.

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

Hi Erik
Thank you for the link in html I tried to change my response to html but is failed
Here is another handy document of general interest
basic knowledge about a transmission line.pdf
I still have a problem to create it as html Hm....
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af erik@...
Sendt: 30. september 2019 07:34
Til: [email protected]
Emne: Re: [nanovna-users] Cal-Kit Standards' Definitions

Kurt.

Thanks for these documents, I updated the link as this will work




It helped me to understand some calibration problems w.r.t. reference planes

Erik.

Hi Oristo
Thank you for your lingual suggestions
I have printed your input for picking up any more suggestions.
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Oristo
Sendt: 30. september 2019 11:32
Til: [email protected]
Emne: Re: [nanovna-users] Cal-Kit Standards' Definitions

C%20calibration%20kit.pdf

I am still puzzling thru this. On page 3:
"As seen the trace is not flowing the circumference off the Smithchart which must spiral inwards in a progressive way."

.. evidently "flowing" should be "following" and "off the Smithchart"
should be "of the Smith chart".
I >>guess<<: " which must spiral inwards in a progressive way" should be understood "but is spiraling inwards", e.g.

"Instead of following the Smith chart circumference, the trace is seen spiraling inward."

.. where this trace is from an unterminated non-ideal cable (not airline), and changing (50 Ohm) LOAD shunt capacitance value C from 51.8 to
-108.2 improves "calibration".

Hi Ned would i be able to try your software please
tas758 at hotmail.com

Currently, and as one of the owners, that is my take on things. I myself have also felt as if I am drinking from a fire hose (5") at times.

Splitting the group would require that members subscribe to multiple groups. I'm not sure that that would be helpful.

Hashtags ans subgroups require that member's associate their posts with the appropriate hashtag or subgroup (to some extent - this sort of organization can be done automatically, but it's not much different than threading).

I'd be willing to entertain anything that helps; I'd want to see what mechanism is being proposed and how it would affect the readability of the forum content (pros AND cons).

So far, I think the best solution is for members to read what is immediately of value based on need and interest and ignore the rest. Remember, the content is always available online if one wants to go back and review a thread.

DaveD

--
This email has been checked for viruses by Avast antivirus software.

I wonder how many actually wants a small form factor.

Me, for one;
* not much space next to PC keyboard

* hands are usually full when going to work elsewhere,
making pocket-size VERY handy.
* with more secure connectors, I could hang
small, light, wireless nanoVNA V3 on e.g. antenna connector,
then access UI from smartphone (carried in belt pouch or another pocket).

Thanks Rune, it's working well now. The only change I would make is to make the traces on the graphs a little wider. Thanks again, Cecil at w5dxp.com