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While Mr. Duffy was rather unkind to both the NanoVNA and Mr. Broberg, he does have an interesting blog. Here he talks about improvised test jigs
Jim, KA6TPR
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The question is, why would anyone care what Mr. Duffy has to say?
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On Thu, Oct 17, 2019 at 12:54 PM, Bilbo wrote:
why would anyone care what Mr. Duffy has to say?
Because in my experience he is usually correct in what he says, and his blog postings lead to greater understanding of various subjects, mainly due to him challenging what others may take for granted, or worse still, may be inadvertently propagating as false information. There is a lot of misinformation on the internet, and there are very few who seem to be bothered to try and correct it when uncovered. Owen is one I'd always listen to, even if personally challenged by what he has said or written. It's happened to me, I've learnt a lot in the process, and continue to respect him. Regards, Martin - G8JNJ
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Hi
Perhaps the caption should have been "nanovna-saver ¨C a premature look".
I mean it is of version 0.1.0. I took a different approach than writing a blog entry, or webpage, about it, namely to engage in the evaluation, and report my findings and suggestions to Rune. So from a kind of "aaaahhhh, no thanks" to "OK, interesting - let's see what this can become."
Indeed I had my head scratching moments too. The very first one was the NanoVNA and -Saver and the indiscriminate use of CH#, Port# and S## (My NanoVNA measures S00, and S10 instead of S11 and S21 etc.). I did a lot of wrong calibrations. Yes, the return loss, S11 (S00), reflection coefficient are not three different names for the same thing. But I am sure we will get there.
With the very best of intentions
Bo
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Martin 5:37am #5091 Martin - G8JNJ wrote: Owen is one I'd always listen to, even if personally challenged by what he has said or written. It's happened to me, I've learnt a lot in the process, and continue to respect him. Ditto for me. After I decided to ignore the irrelevant emotional content, I learned a lot from Owen Duffy.
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I have made a test jig for my VNA based on a ZIF socket. I always measure
with the ZIF socket closed, even if nothing is locked into it. A short is
literally a tiny piece of wire a couple of mm long. The open is no wire,
and the load is a 1/8 watt 50 ohm resistor. The ground is soldered to one
row of the ZIF socket, port 1 is half the pins on the other row, and port 2
is the other half, so that the two ports only need to be bridged by about
2.5 mm to obtain the short measurement.
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On Thu, Oct 17, 2019 at 11:15 AM W5DXP <w5dxp@...> wrote: Martin
5:37am #5091
Martin - G8JNJ wrote: Owen is one I'd always listen to, even if personally challenged by what he has said or written. It's happened to me,
I've learnt a lot in the process, and continue to respect him.
Ditto for me. After I decided to ignore the irrelevant emotional content,
I learned a lot from Owen Duffy.
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Daniel, can you add a picture? Sma female on a board, or just a couple of short wires to a female?
Jim, KA6TPR
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The Antenna Analyzer made by EU1KY was further developed by Ian, KD8CEC, it used a similar calibration solution here. It is important for L / C measurement when you use open, short circuit, and load 50 Ohm calibration elements on millimeter-accurate spikes of the same size. As I have been following and building the EU1KY AA myself, you can read more on my website that interests me.
73, Gyula HA3HZ
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It's been my experience that those who can, do. Those who can't, criticize. I'm sure Rune would appreciate suggestions as to how to improve his software. But, at least he gave us a start. It's up to us to help develop the application.
My nickel's worth.
Bruce Nebergall / K4TQL
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Bruce, I completely agree. Rune¡¯s code is available to all of us. If there¡¯s something I¡¯d like to see added (and there are two small mods), I look at it as an excellent reason to learn Python and make the mods myself.
- Jeff, k6jca
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Hi Jeff, I take a different approach to the test fixture, Mine in a copper sheet between a pair of PCB mount male connectors with alligator clips to the DUT. Since most of my work in <100 MHz, it works for me. I get a good 50 dB isolation. Mel, K6KBE On Fri, Oct 18, 2019 at 11:33 AM Jeff Anderson <jca1955@...> wrote: Bruce, I completely agree. Rune¡¯s code is available to all of us. If
there¡¯s something I¡¯d like to see added (and there are two small mods), I
look at it as an excellent reason to learn Python and make the mods myself.
- Jeff, k6jca
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Mr. Duffy also seems to be putting in his waist and buying a nanovna - see today's blog post here:
You are not expected to criticize the device without the device.
We are looking forward to the developments.
ps. sorry, I just remembered this post so I wrote it
Gyula, HA3HZ
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Well mister Duffy should learn to deal with online vending site..
Never had a big problem with any seller that have been selling for at
least a year.
And about the fact that the development is not centralized, I so like
the fact that anyone can complete the development any time, and any
one can develop a new software for it.. anyone that think only one
should have the control of projects is looking to a big deception when
the "owner" decide to stop the work on a device cause he deem it is ok
like that..
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Le sam. 26 oct. 2019 ¨¤ 14:28, Gyula Molnar <gyula.ha3hz@...> a ¨¦crit :
Mr. Duffy also seems to be putting in his waist and buying a nanovna - see today's blog post here:
You are not expected to criticize the device without the device.
We are looking forward to the developments.
ps. sorry, I just remembered this post so I wrote it
Gyula, HA3HZ
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Perhaps he should have ordered from Amazon.
Never had a delivery problem.
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On 26 October 2019 at 15:58 Pierre Martel <petem001@...> wrote:
Well mister Duffy should learn to deal with online vending site..
Never had a big problem with any seller that have been selling for at
least a year.
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On Sat, Oct 26, 2019 at 09:59 PM, Pierre Martel wrote:
.. anyone that think only one
should have the control of projects is looking to a big deception when
the "owner" decide to stop the work on a device cause he deem it is ok
like that..
Definitely! We had this problem on EEVBlog in FY6x00 AWG's thread, where our great contributor, Fremen67 from France, put tremendous effort to prepare our own DIY firmware for these gens, than mysteriously disappeared for over a year, without any previous signs of problems, and some weeks ago he miraculously reappeared. Should I emphasize, that he make his work in old, closed style, so any progress during his absence was/is absolutely impossible. We may only test results of his work, but don't contribute in any serious way...
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This is a primary reason I made my VNA design with both open source
hardware and software, even permitting commercial use and sales. If
someone would like to continue the work or fork it, the more power to
them. This is one of the big concerns I have about the NanoVNA, is that
while the software is open, the hardware is not explicitly so, and there
are multiple vendors with PCBs that can't be reproduced. So who knows if
the current design will be reproducible if the current manufacturers stop
selling it?
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On Sun, Oct 27, 2019 at 5:37 PM Jacon Zar <jaconzar@...> wrote: On Sat, Oct 26, 2019 at 09:59 PM, Pierre Martel wrote:
.. anyone that think only one
should have the control of projects is looking to a big deception when
the "owner" decide to stop the work on a device cause he deem it is ok
like that..
Definitely!
We had this problem on EEVBlog in FY6x00 AWG's thread, where our great
contributor, Fremen67 from France,
put tremendous effort to prepare our own DIY firmware for these gens, than
mysteriously disappeared for over a year,
without any previous signs of problems, and some weeks ago he miraculously
reappeared.
Should I emphasize, that he make his work in old, closed style, so any
progress during his absence was/is absolutely impossible.
We may only test results of his work, but don't contribute in any serious
way...
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Starsekr
Bo, OZ2M
Oristo
Gyula Molnar
