开云体育

New forum for the V2 at /g/nanovna-f/topics and more info from official store

Bob GM4CID

Hi Rune. Many thanks for a fantastic application, and to everyone else who has contributed. I have had hours of fun testing various filters, antennas and so on learning how to use the NanoVNA and the NanoVNA Saver software.
A few comments - apologies if they have already been mentioned and I missed the messages.

First for the TDR function, which works great. It would be nice however if the scale of the TDR chart could be adjusted to focus in on the cable itself, and perhaps spot any discontinuities. For example I have an 18m or so cable attached at the moment, but when the TDR chart is shown the horizontal scale is 0-3447.1m, so the area of interest is just in the first few pixels. It would be more useful if the scale could adjust to say 150% of the measurement, or be manually set by the user. Or maybe I just need educating in how to interpret the chart? Is the NanoVNA capable of detecting discontinuities along a cable such as a poor connection or a kink?

Second is a file picker for the calibrations

Thanks again, the hours of work this must have taken is appreciated.

73, Dave M0WID

Dave K wrote:-

When I briefly showed the NanoVNA at my radio club, several remarked they
could not see the screen as it was too small. I would add, the average aget
of the members in my radio club must be late 60's, with the oldest being in
their 80's, and the youngest in their 50's, so their eyesight is probably
not as good as a youngster.

Reading glasses.
I finally decided this year to bother having some, rather than rely on "DX glasses".
Makes a world of difference.
None of us are getting younger ;-)

73 de Andy

On Tue, Sep 24, 2019 at 12:27 PM, Dr. David Kirkby from Kirkby Microwave Ltd wrote:

The name of my company, it's company number, where it is registered, and
the registered address is required under UK law.

With the greatest of respect, you are not on a professional forum, or any forum that requires your company details.
The forums that you inhabit are typically hobbyist in nature.
As such there is no need to company addresses, adverts or inferred forms of self aggrandisement within your messages.
Sorry, just sayin'.

- Andy -

Well, Dr. David Kirkby from Kirkby Microwave Ltd is using this form as advertising for his business... clearly.

Michael, WT9V

No problem Tom, thanks again for the suggestion :-)

--
Rune / 5Q5R

Hello,

Here are the references - for a few wrongly shaped pdfs you may use,
please, a "secure" removal tool - e.g. the freeware :


[1] Total Differential Errors in One-Port Network Analyzer Measurements with
Application to Antenna Impedance:


[2] Measurement Uncertainty in Network Analyzers: Differential Error Analysis
of Error Models Part 1: Full One-Port Calibration:


[3] Measurement Uncertainty in Network Analyzers: Differential Error Analysis of
Error Models Part 2: Full Two-Port Calibration:


[4] S-Parameter Uncertainties in Network Analyzer Measurements with
Application to Antenna Patterns:


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


[6] Measurement Uncertainty in Network Analyzers: Differential Error
Analysis of Error Models Part 4: Non-Zero Length Through in Full
Two-Port SLOT Calibration:


[7] Measurement Uncertainty in Network Analyzers: Differential Error
DE Analysis of Error Models Part 5: Step-by-Step Graphical
Construction of Complex DE Regions and Real DE Intervals:


Sincerely,

yin&pez@arg

7

Hi Rune,

Wow - Your amazing!!! Looks perfect!

Many thanks!
Tom
VA7TA

qrp.ddc wrote …
Hope they will not use integrated ADC, because it will reduce performance a lot.
---------------------------------------------------------------------------------------------------------------

qrp.ddc,

That issue was raised and the reply was:

"The VGA will extend dynamic range to 100dB, plus ADC dynamic range is nowhere near being the bottleneck"

"ADC dynamic range is far from being the bottleneck. If the ADC is sampling at 1Msps and the VBW is 1kHz, a 60dB ADC dynamic range leads to a 90dB measurement dynamic range, which is more than sufficient."

"I have a prototype of a NanoVNA variant using the built in ADC on the stm32. The measurements using it are nearly identical to the audio codec variant. The reason all NanoVNAs on the market do not use this version is because of software compatibility."

Hope they the design team is correct and we don't see the degradation in performance you anticipate by removing the audio codec.

Herb

From: Dr. David Kirkby from Kirkby Microwave Ltd

The name of my company, it's company number, where it is registered, and
the registered address is required under UK law.

I would have thought my messages are shorted than most, as I only quote
relevant content, and remove all irrelevant stuff.
===========================

David,

I do like that you make an attempt to include a brief summary of the topic to which you are replying. All to often this is missing, making it more difficult for those of use reading the group via e-mail.

BTW: four lines of signature is the recognised Internet etiquette.

73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv

I have a suspicion that they are not the right material for the low frequencies involved (3.5-14 MHz).

For these frequencies, the key is the number of turns. You need a ring (not a snap-on cylinder), and thread the coax as many times as you can through it. If your application is QRP or RX only, use thin coax (like RG-174).
A single snap-on only helps on VHF. You need a dozen of them to see a difference.

73, Mike AF7KR

Hope they will not use integrated ADC, because it will reduce performance a lot.

Additional tidbits of information.

1. The V2 PCB is 4 layers.
2. The schematics will be posted soon, at the same time as the launch on taobao,
3. Design objectives include keeping BOM cost below $100 and compatibility with current software base.

A contact located in China indicated that the schematics are available now but only via private request. I haven't seen any info regarding screen size, but Hugen has posted in the past about prototyping with a 3.5-inch LCD. I would expect something that size or larger to keep up with the nanoVNA-F that is now being sold.

Hi Rune,

I asked because some programs require minimal resolutions, otherwise dialog boxes etc. are cut off. Good to know that this is not the case with nanovna-saver.

Regards,
Arndt

Am 24.09.19 um 16:22 schrieb Rune Broberg:

It almost looks like you already have! ;-)

I'll definitely consider it.

--
Rune / 5Q5R

It doesn't *require* any particular resolution, but the interface only fits
in the vertical direction if there's at least ~750 pixels. So there would
be scroll bars. It's not the end of the world. :-)

--
Rune / 5Q5R

On Tue, 24 Sep 2019 at 16:00, diesolinger via Groups.Io <diesolinger=
[email protected]> wrote:

Hello,

What is the minimal screen resolution for nanovna-saver? I have an old
netbook with 1024 x 600 pixels which I could take with me to connect to the
nanovna.

Regards,
Arndt

Hi RUne,
Might you be able to add a port rescan button so we don't have to restart the application if we change USB ports?

Thanks,
Larry

Hello,

What is the minimal screen resolution for nanovna-saver? I have an old netbook with 1024 x 600 pixels which I could take with me to connect to the nanovna.

Regards,
Arndt

Hi Erik
Super, I will test it within a couple of days as I am on a job where T-Check will be made
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af erik@...
Sendt: 24. september 2019 11:52
Til: [email protected]
Emne: Re: [nanovna-users] on the comparisons

Kurt,

Allow me to share my T-check excel spreadsheet.

Copy your 2 port touchstone data into the yellow cells and the graph will show the deviations

Hope I did not make a mistake in the calculations.

Reginald, if you can spare a moment or two, please contact me off list.

Thanks.

John

at radio station VE7AOV.

if455kc@...

+++++


On 2019-09-23 7:38 p.m., Reginald Beardsley via Groups.Io wrote:

I think this promises to be a very interesting thread.

I spent my career solving wave equation problems.

...

--