开云体育

Gunthard,
thank you very much for your excellent documentation! It's a great honour
to have someone write about my little piece of software, and I hope the
users find it a useful guide!

--
Rune / 5Q5R

Gunthar,
Thanks for your contribution to the community. Glad to see you are staying active and putting your retirement years to good use.

Regards,

- Herb

Thanks Kurt this is impressive and many thanks to Gunthard


Keith g0hkc

Get Outlook<> for iOS
________________________________
From: [email protected] <[email protected]> on behalf of Kurt Poulsen <kurt@...>
Sent: Monday, December 2, 2019 10:02:10 AM
To: [email protected] <[email protected]>
Subject: [nanovna-users] Great news from Gunthard Kraus with

Hell All

Please visit the homepage for Gunthard Kraus and the many good articles he
has written in both German and English Language

He just added a huge "Getting started manual" for the NanoVNA in German and
English

The direct links are shown below


<

Kind regards

Kurt

On 30/11/2019 18:09, Rune Broberg wrote:

Hi Allison,
just a small correction: Python 2.7 is 9 years old, and at the time of
release was described as "the last major version in the 2.x series". The
author of Python requested that developers move from Python 2 to Python 3
in 2014.

I'll be happy to hear about it if you get the software running under Python
2.7. :-)

FYI Nanovna-saver is also fine under python-3.8 here.

can anyone give me info on this firmware and if its worth upgrading?:0.2.3-2-g8ac9166

Hello Friends,
my Name is Gunthard Kraus, DG8GB, and I am a retired Professor of the Duale Hochschule at Friedrichshafen / Germany.

Even a retired Professor cannot stop thinking and working and so you find in my Homepage

www.gunthard-kraus.de ( )

a complete tutorial amd getting started Manual with three parts (54 pages, including 5 practical examples), numbered V1.4.1 for the NanoVNA-saver Version 0.2.0.

Have fun with it.

73s

Gunthard
==================================================

Danke!

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

Very nice document!!!!!!!



Recommended for all new (and other) users

--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

bare PCB with a 50ohm through line and sma pcb connector solder pads

search messages here using, e.g. sma fixture
/g/nanovna-users/message/6681
/g/nanovna-users/message/5571

To find words that work well, search eBay, e.g.:

rf sma pcb



sma breakout



sma eval


bias tee


vna demo


my favorite (because small, cheap and easily hacked):


In theory, searching here by #Hashtag could help,
but practically new message topics with questions rarely use them.

Hell All

Please visit the homepage for Gunthard Kraus and the many good articles he
has written in both German and English Language

He just added a huge "Getting started manual" for the NanoVNA in German and
English

The direct links are shown below


<

Kind regards

Kurt

Hello Friends,
my Name is Gunthard Kraus, DG8GB, and I am a retired Professor of the Duale Hochschule at Friedrichshafen / Germany.

Even a retired Professor cannot stop thinking and working and so you find in my Homepage

www.gunthard-kraus.de ( )

a complete tutorial amd getting started Manual with three parts (54 pages, including 5 practical examples), numbered V1.4.1 for the NanoVNA-saver Version 0.2.0.

Have fun with it.

73s

Gunthard

where can I obtain the boards as used by W0QE and others to make various test
boards?. Sorry, I'm not even sure about how to describe them, the bare PCB
with a 50ohm through line and sma pcb connector solder pads.

On Sun, Dec 1, 2019 at 04:59 PM, Roger Need wrote:

I am new to this group and did not fully understand the driver reference in
the Wiki when I made my original request for help. Since then I have made
several driver install tests. I also tried downloading the driver from ST at
the Wiki link and it did install correctly in Windows 8.1. It was exactly the
same driver and version number (1.4) that Windows update installed. I checked
to see what Zadig installed and it was a different driver called "libwdi" USB
serial but it worked too.

==========================================================================

Roger,
Thanks for confirming that the driver located in the Wiki also works. You are not the only new member that has expressed difficulty initially locating the group's Wiki and Files section. In the future I will additionally provide a direct link when referring a member to either of those locations.

Once a member is familiar with the Wiki and Files sections they are able to do a lot of self-help on their own. Of course if you still have questions the more experienced users always seem glad to help out. I've found this group to offer mostly substance and very little pomp.

Enjoy using your NanoVNA!

- Herb

Installed and working well I see a dashed magenta line on many of the plots. It is not obvious to me why it is there. Is it possible to move it or remove it from the graph of data?

So installing the STM32 Virtual COM Port Driver from
as suggested by
this group's Wiki page did not work for you? If so then the Wiki needs to be
updated by adding that Zadig is also required to properly install the serial
driver for Windows versions below 10.

- Herb

Herb,

I am new to this group and did not fully understand the driver reference in the Wiki when I made my original request for help. Since then I have made several driver install tests. I also tried downloading the driver from ST at the Wiki link and it did install correctly in Windows 8.1. It was exactly the same driver and version number (1.4) that Windows update installed. I checked to see what Zadig installed and it was a different driver called "libwdi" USB serial but it worked too.

#80: [S]-parameters from [Z]-parameters
-
#78'': #78' was re-corrected
20 November 2019 :

Hello,

Allow us, please, to inform you that in the preparation of the
presentation of the measurements of S-parameters of a 2-port
network using the [LeastVNA] only, we had to re-produce
-from the very beginning- the needed mathematical expressions of
S-parameters in terms of Z-parameters, which we just uploaded at:



Sincerely,

gin&pez@arg

:80#

I should have said, I`m using Win 10 and it is working great with it.

Hi, I got one one of these a few days ago and what a great piece of kit for the price, I have grasped the basics of it with and getting on great, I tried the PC software NanoVNA Saver by Rune Broberg, which is also working great but are there any user manual or help files for the PC software. Thanks, Johnny GM7LSI

Something I have mentioned on other groups is in order here.

For sake of argument (and real life), consider only two types of SWR meters:
1) A meter with multiple power levels selected by switches.
Assume these are 20, 200, and 2000 Watts. These are usually the least
expensive
measurement devices, and, therefore, more prevalent among
the amateur community.
2) A good cross needle meter with the same ranges.

For #1, if the power incident from the transmitter is at the rated
calibration levels, i. e. 20, 200 and 2000 Watts (above legal power), the
meter will read correctly within its tolerance range (BTW, the Bird is
rated at 5% of full scale). If your transmitter puts out 100 watts and you
have the 200 watt scale selected, the SWR will read in error. If you run a
legal limit amplifier at 1500 watts output and you have selected the 2000
watt scale, the meter likely will read SWR incorrectly. This is due to not
being able to *normalize* the full-scale meter reading to the incident
power. If you don't understand normalization, look it up. Have a read
of: <> under the Mathematics
and Statistics subheading. Virtually all the old SWR meters (I had the
Knight unit some 50 years ago) required normalization to full scale in the
forward position for what ever incident power was fed through the sampled
line. They did not suffer the inaccuracies of today's meters that do no
allow for normalization to incident power. However, they did not pretend
to measure actual forward and reverse *power*.

For #2, the case of the previous paragraph is not so. Being a cross needle
meter, the intersection of the needles, representing forward and reverse
power, so-to-speak, are self-normalizing and will always read correctly
from the meter face within the tolerance of the meter.

Take the Bird (or equivalent - NOT MFJ, please) with a 2.5 kW head and
incident power of 1000 watts. 5% of 2.5 kW is +/-125 watts - the rated
tolerance of the Bird line of watt meters. That means that your 1000 watts
could read 1000 +/- 125 watts or 875 to 1125 watts, all within the rated
full scale tolerance of 5%. But maybe we have a peak reading meter on our
amplifier that shows 1001 watts for either speech or CW key-down. Which of
the three values are correct, 875 watts, 1125 watts, or 1001 watts? All
are correct within the tolerance of the measurement instrument.

Dave - W?LEV

--

*Dave - W?LEV*
*Just Let Darwin Work*
*Just Think*

Several reasons:

The SWR meter is not well calibrated. Simple diode detectors
have error and that varies with power.

Transmitter has harmonic content, that tends to increase SWR
as the harmonics may be outside the band the antennas is matched for.

The antenna system has RF on the shield. It can be due to imbalance,
mismatch at the radiating element end of the coax. In the case of the
transmitter the cable (coax) is in a area of high field strength and there
are induced currents on the shield that would be hard to see at much
lower power.

If you see different behavior from the VNA with USB power or longer
coax ( holding it vs laying on table) its a safe bet the antenna system
has issues.

Allison
-----------------
I do not accept private email due to forum scraping groups.io

Its a way to permit using attenuation where you need it
and allow for gain as needed.

I can be used with a different reference such as 75 ohms (any actually)
for systems that are not 50 ohms to make measurements.

An example using that bridge is measuring a radios input impedance
where a very small signal may over load the radio.

If you put a attenuator on port 0 (s11) the return is also attenuated
and the results are hard to discern.

With the bridge you can attenuate the output and see the returned
signal from the radio input using port2 (s21) and if the signal is
weak one can add an amplifier (suitable type) at the input to PORT2.


There are other measurements that may require that as well
for example at higher powers.

The basic instrument is very flexible but the basis of it is a
RF source that has a matching detector that can present
phase and amplitude information.

-----------------
I do not accept private email due to forum scraping groups.io