开云体育

Hi again Jeff;

Don't you just love it when your comments get posted before you are finished drafting it? :-)

I had only one final comment in my response to you on this...

The important significance of this new algorithm is that it entirely mitigates the need for an independent multi-term calibration process and/or algorithm. The accuracy of the corrected result is determined precisely by the defined accuracy of the standards used. The standards corrections, and measurement uncertainties are embedded and included in every measurement, and utilized by the algorithm to compute the corrected result.

--
73

Gary, N3GO

Hi Jeff;

I agree that the proof is certainly terse as you say. Likely an additional and serendipitous artifact of the elegance of the approach. :-)

The use of ideal -1, 0, and +1 standards in the proof simply serve to define them as ideal. Keep in mind also that all variables are complex values; hence the ideal standards all have imaginary components of zero. While these values can, and in many, if not most, cases will be defined as ideal in practice, it is the objective of calibration to normalize the measured standards to those boundaries. They are and will be set to the value and accuracy defined by the user based on their knowledge of the test standards used in their application, and the accuracy to which they wish to have them defined whether through published manufacturing tolerance specifications, or through elaborate laboratory characterization and comparison to certified industry reference standards.

The defined or "given" values as well as the computed result are upper case, and all lower case variables represent raw data measurements, with G being equal to the corrected reflection coefficient of a DUT exhibiting a measured reflection coefficient of g.

t



--
73

Gary, N3GO

I don't think that has touch capability.Bob

Hmmm. That is indeed interesting.

DaveD

Sent from a small flat thingy

Dr. Steber is one of my favorite authors. He has published easy to follow articles on DIY VNA's and other instruments in QEX magazine and Nuts and Volts magazines over the years. Pretty much all those articles are available for download on the web. Its usually just a matter of waiting for some time after the initial magazine is published before selected articles start to appear.

Entire QEX magazine archives from 1982-2016 have been available at for some years now.

I don't have a subscription to QEX but if there is content that interests me I do purchase individual issues as a way of supporting the author and encouraging him to publish future articles.

- Herb

From: Dave Daniel: Define “common knowledge”.

I would say anything that can be obtained from simply surfing the web.

On the other hand... (Copied from under Fair Use provisions):

In June 2011, Judge Philip Pro of the District of Nevada ruled in Righthaven v. Hoehn that the posting of an entire editorial article from the Las Vegas Review Journal in a comment as part of an online discussion was unarguably fair use. Judge Pro noted that "Noncommercial, nonprofit use is presumptively fair. ... Hoehn posted the Work as part of an online discussion. ... This purpose is consistent with comment, for which 17 U.S.C. § 107 provides fair use protection. ... It is undisputed that Hoehn posted the entire work in his comment on the Website. ... wholesale copying does not preclude a finding of fair use. ... there is no genuine issue of material fact that Hoehn's use of the Work was fair and summary judgment is appropriate." On appeal, the Court of Appeals for the Ninth Circuit ruled that Righthaven did not even have the standing needed to sue Hoehn for copyright infringement in the first place.

73

-Jim
NU0C

On Sat, 21 Dec 2019 17:19:09 -0600
"Jim Shorney" <jshorney@...> wrote:

No, it does not. It covers Fair Use quoting, which is the point.

73

-Jim
NU0C

On Sat, 21 Dec 2019 17:24:01 -0500
"Dave Daniel" <kc0wjn@...> wrote:

But that does not include wide re-publication .

DaveD

Sent from a small flat thingy

On Dec 21, 2019, at 17:10, Jim Shorney <jshorney@...> wrote:


It is allowed as "Fair Use".



"In its most general sense, a fair use is any copying of copyrighted material done for a limited and “transformative” purpose" (fair use of the first sentence of the above web page).

73

-Jim
NU0C


On Sat, 21 Dec 2019 21:07:00 +0000 (UTC)
"Bob Albert via Groups.Io" <bob91343@...> wrote:

Quoting is always at the discretion of the copyright holder. Any part of a copyrighted work is protected.
Bob
On Saturday, December 21, 2019, 12:57:02 PM PST, W5DXP <w5dxp@...> wrote:

Isn't it OK to quote copyrighted articles as long as one credits the source? How about just quoting the parts that are not already common knowledge?

No, it does not. It covers Fair Use quoting, which is the point.

73

-Jim
NU0C

On Sat, 21 Dec 2019 17:24:01 -0500
"Dave Daniel" <kc0wjn@...> wrote:

But that does not include wide re-publication .

DaveD

Sent from a small flat thingy

On Dec 21, 2019, at 17:10, Jim Shorney <jshorney@...> wrote:


It is allowed as "Fair Use".



"In its most general sense, a fair use is any copying of copyrighted material done for a limited and “transformative” purpose" (fair use of the first sentence of the above web page).

73

-Jim
NU0C


On Sat, 21 Dec 2019 21:07:00 +0000 (UTC)
"Bob Albert via Groups.Io" <bob91343@...> wrote:

Quoting is always at the discretion of the copyright holder. Any part of a copyrighted work is protected.
Bob
On Saturday, December 21, 2019, 12:57:02 PM PST, W5DXP <w5dxp@...> wrote:

Isn't it OK to quote copyrighted articles as long as one credits the source? How about just quoting the parts that are not already common knowledge?

One of our members posted a document in the "Filed" section showing his upgrade procedure to a 3.2" screen @ /g/nanovna-users/files/Hardware%20Mods/NanoVNA%20new%203.2%20LCD%20display%20Herman%20ON1BES.pdf .

If you decide to go with a 2.8" replacement screen and have difficulty seeing the screen fonts then you might give hugen's 0.4.0AA firmware a try. It has a larger font size with the main penalty being only 4 memory storage locations instead of 5. See attachment for example display.

- Herb

Many thanks to all for the valuable feedbacks

Will come back once I managed.

At the moment the app runs like a charm, but I prefer to publish it only once completed with the calibration part.

73 de HB9IIU

#89: On the Comparison of our Formulation with that by Erik, PD0EK
-
REFERENCES
[1] 21 December 2019 - /g/nanovna-users/message/8459
[2] 21 December 2019 - /g/nanovna-users/message/8482
-

Hello,

Allow us, please, to announce that we uploaded our results, using our copy of Maxima
64-bit 5.43.0 running under our wxp64p&sp2, from our comparison of our formulation [1]
with that proposed by Erik, PD0EK [2], at:



Also allow us, please, to inform The Common User, who interested enough, that we
also uploaded this Maxima program by us, at:



Sincerely,

gin&pez@arg

#89:

just select the 2nd pic to get the touchscreen version.

try this,its biggfer but will work:

I don't have the information you seek; however there is a larger version of the nano selling for around $150.? You might consider this as an opportunity to get a larger screen.? The original is painfully small.? In some cases I find need to use a magnifying glass.
Compounding this is the fact that young engineers don't seem to have a grasp of hardware and those who do aren't young (such as myself) and so have vision issues.
Perhaps you can locate a donor unit that has failed in some other way.
Bob K6DDX

My VNA arrived with a busted screen, very bad packaging, unit works when connected to my computer.
I received a full refund from Amazon despite what the vendor wanted which was a 40% refund..
I would like to replace the screen but can't find a model or part number for it.
As suggestions would be greatly appreciated.
Thanks for the help!

But that does not include wide re-publication .

DaveD

Sent from a small flat thingy

It is allowed as "Fair Use".



"In its most general sense, a fair use is any copying of copyrighted material done for a limited and “transformative” purpose" (fair use of the first sentence of the above web page).

73

-Jim
NU0C


On Sat, 21 Dec 2019 21:07:00 +0000 (UTC)
"Bob Albert via Groups.Io" <bob91343@...> wrote:

Quoting is always at the discretion of the copyright holder.? Any part of a copyrighted work is protected.
Bob
On Saturday, December 21, 2019, 12:57:02 PM PST, W5DXP <w5dxp@...> wrote:

Isn't it OK to quote copyrighted articles as long as one credits the source? How about just quoting the parts that are not already common knowledge?

Quoting is always at the discretion of the copyright holder.? Any part of a copyrighted work is protected.
Bob

Define “common knowledge”.

DaveD

Sent from a small flat thingy

Isn't it OK to quote copyrighted articles as long as one credits the source? How about just quoting the parts that are not already common knowledge?