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Date
Re: Where to buy in US and other questions #shielding #buying

 

On Tue, Jun 2, 2020 at 09:56 AM, Larry Rothman wrote:

I contacted R&L about buying and shipping a Nanovna-H4 to Canada. They sell the H4 for $60US but they quoted me $30US for USPS shipping to Toronto which
sounds way too high.
=================================
Larry,
$30 for shipping sounds high to me also. I believe shipping for an -H4 cost me around $10 here in the states and I received it in 4-days. I would have called and asked for a better deal for our North American neighbors :)

- Herb
Re: Dark Mode

 

Use Display setup

--
*** nothing is permanent only change ( ) ***

ScreenHunter_02 Jun. 02 21.51.png

Re: What does S21 mean in this context?

 

S21 isn't used in your antenna tuning context. You can turn off this trace to avoid confusion, unless you like the "modern art" it produces on the screen.

The USB C port doesn't need to speak "To-Go" since the nanoVNA acts a as a peripheral, not a host. You can connect to it with either a USB C to USB C cable from either a phone or computer or a USB A to USB C cable from a computer or phone that needs a "USB to go" adapter.
Re: Calibration quick one

 

Answer: YES. When the range changes, calibration must be performed.
The number of calibration / measurement points is 101 on the basic unit.

73, Gyula HA3HZ

--
*** read more on this site ( ) ***
Re: What does S21 mean in this context?

 

Your photo shows S21 phase on the display. This is the phase of the (weak) S21 leakage. If you change it to magnitude, you will see the leakage signal strength. When using the VNA as an antenna analyzer, you can just turn the S21 traces off altogether.
--John Gord

On Tue, Jun 2, 2020 at 11:51 AM, <wsanders@...> wrote:


I am using the NanoVNA-F to tune a 75m mobile antenna (see picture.) There is
an interesting pattern on the S21 trace. The VNA has been calibrated only
using SOL (short-open-load). I have S21 "capped" with the "open" calibration
accessory.

What does the S21 reading mean in this context, if anything? Is this just
signal "leaking" back into S21 (for lack of a better term.)

This is a great tool! It made short work of telling me this antenna (a 75m
Shark hamstick-clone) was wound with a little too much inductance, and the
only way to match it was with a cap shunt across the base.

The F variant is pretty nice, it has an big touch screen, you don't really
need to use the wheel. The screen is very similar to my Arduino touch screen
shield. It has a monster battery (500maH allegedly), big enough that the
makers added a USB port solely for using the NanoVNA as a charging source. I
bought mine with a "demo kit" with various components to show how real
circuits respond to calibration errors, etc. One drawback so far is that the
USB port is a "C" port, and it doesn't speak the USB-C protocols required for
"To-Go" signaling, but I odn't really have a need for tha PC or phone apps.
Re: Calibration quick one

 

On Tue, 02 Jun 2020 12:12:01 -0700, you wrote:

Hello all, Quick question please. If I calibrate my nano from 1Mhz to 900Mhz and I want to change my frequency to 7Mhz to 71Mhz do i have to calibrate again or is this still in range of the original cal. Cheers Kev
Recalibrate.
The number of calibration points is limited.

w.
Calibration quick one

 

Hello all, Quick question please. If I calibrate my nano from 1Mhz to 900Mhz and I want to change my frequency to 7Mhz to 71Mhz do i have to calibrate again or is this still in range of the original cal. Cheers Kev
Re: What does S21 mean in this context?

 

Are you aware there is a -F variant specific group?

Regarding S21 have you made a SOLT calibration in the frequency range of
interest?

A ter?a, 2/06/2020, 19:52, <wsanders@...> escreveu:

I am using the NanoVNA-F to tune a 75m mobile antenna (see picture.) There
is an interesting pattern on the S21 trace. The VNA has been calibrated
only using SOL (short-open-load). I have S21 "capped" with the "open"
calibration accessory.

What does the S21 reading mean in this context, if anything? Is this just
signal "leaking" back into S21 (for lack of a better term.)

This is a great tool! It made short work of telling me this antenna (a 75m
Shark hamstick-clone) was wound with a little too much inductance, and the
only way to match it was with a cap shunt across the base.

The F variant is pretty nice, it has an big touch screen, you don't really
need to use the wheel. The screen is very similar to my Arduino touch
screen shield. It has a monster battery (500maH allegedly), big enough that
the makers added a USB port solely for using the NanoVNA as a charging
source. I bought mine with a "demo kit" with various components to show how
real circuits respond to calibration errors, etc. One drawback so far is
that the USB port is a "C" port, and it doesn't speak the USB-C protocols
required for "To-Go" signaling, but I odn't really have a need for tha PC
or phone apps.
What does S21 mean in this context?

[email protected]
 

I am using the NanoVNA-F to tune a 75m mobile antenna (see picture.) There is an interesting pattern on the S21 trace. The VNA has been calibrated only using SOL (short-open-load). I have S21 "capped" with the "open" calibration accessory.

What does the S21 reading mean in this context, if anything? Is this just signal "leaking" back into S21 (for lack of a better term.)

This is a great tool! It made short work of telling me this antenna (a 75m Shark hamstick-clone) was wound with a little too much inductance, and the only way to match it was with a cap shunt across the base.

The F variant is pretty nice, it has an big touch screen, you don't really need to use the wheel. The screen is very similar to my Arduino touch screen shield. It has a monster battery (500maH allegedly), big enough that the makers added a USB port solely for using the NanoVNA as a charging source. I bought mine with a "demo kit" with various components to show how real circuits respond to calibration errors, etc. One drawback so far is that the USB port is a "C" port, and it doesn't speak the USB-C protocols required for "To-Go" signaling, but I odn't really have a need for tha PC or phone apps.

IMG_20200602_111342.jpg

Re: What apps use Touchstone files? #applications

 

On Wed, 27 May 2020 at 17:04, Roger Need via groups.io <sailtamarack=
[email protected]> wrote:

Touchstone is a file format that provides a standardized way for programs
to output S parameters (S11, S21) so they can be read by other programs.
The extension can be .s1p, .s2p etc.
That's not the whole story. A Touchstone file can store data in other
formats too - Y, Z, G or H parameters. However, S parameters is the most
common.

I would be interested if you Google Touchstone file - what link comes at
the top of Google?

Strangely this link is one of the most visited ones on my website. I don't
know about others, but when I Google Touchstone file, this link on my
website comes up number 1 - before Wikipedia, Keysight or anywhere else. I
have never quite worked out why.



I have an HP 4284A LCR meter, and decided to write the data in a Touchstone
file, in the impedance format (Z). A lot of software can't read anything
other than S-parameter format Touchstone files. ADS can, as can the free
sonnet lite, but most programs can't read anything other than S-parameters,
even though the Touchstone specification includes other formats.

i have even met software that can't handle any impedance other than 50 ohms.

Noise data is also supported in Touchstone files.

Dave
Re: out of "Presentation on the NanoVNA for the raileigh Radio Society", Now: "False Return Loss Calculations"

 

Does all of this mean that the RL on the NanoVNA and VNA Saver are wrong and should be positive??Deon

-------- Original message --------From: DJ7BA <dj7ba@...> Date: 2020/06/02 19:19 (GMT+02:00) To: [email protected] Subject: Re: [nanovna-users] out of "Presentation on the NanoVNA for the raileigh Radio Society", Now: "False Return Loss Calculations" Thanks, Alan - wonderful source !? I love it. You made my day!Congrats for having shown this. I can only agree.From it's second very basic formula, (when leaving alone the '(db)',)it is possible to derive the correct |Gamma| formula, as is used in the first one.Resulting is:with L for Load and S for Source, the asterisk meaning conjugate complex.Just one little remark - knowing we cannot easily change words everybody uses:The "incident" and "reflected" power is found on a transmission line.At a complex impedance termination of a complex impedance source,there is nothing reflected, however.The power difference, instead, is that between "available" (but not always fully used)real power and the real power actually delivered to and dissipated in the load¡¯s real part.???? In which exact IEEE document did you find it????? When was that published? Where and how can I get a copy?Why does the probably best Smith diagram program available today,(that I do not want to name in this context,) when using a complex source,ignore the IEEE quote and rather stick to that false ATIS like formula?Why does ATIS not change the false one? I think, time has come to do so.Thanks again Alan - for this, it's the best source I ever was shown so far !73, HansDJ7BA-----Urspr¨¹ngliche Nachricht-----Von: [email protected] <[email protected]> Im Auftrag von alan victorGesendet: Dienstag, 2. Juni 2020 18:31An: nanovna-users@...: Re: [nanovna-users] out of "Presentation on the NanoVNA for the raileigh Radio Society", Now: "False Return Loss Calculations"On this return loss discussion... sorry can't help myself...See the attached. Hope that clarifies... again.Alan--Diese E-Mail wurde von Avast Antivirus-Software auf Viren gepr¨¹ft.
Re: PC software with "CW" function SOLVED with avvidclif's freq command !

 

Herb,

Thank you for your message and? explanations for use above 300 Mhz.

Most of time, i use the VNA from 1.8 to 146 MHz but sometimes until 440 MHz.

For this reason, i will follow your recommendation and construct a 300 MHz high-pass filter.

Regards,

Rudi

Le 02.06.2020 ¨¤ 18:38, hwalker a ¨¦crit?:
On Tue, Jun 2, 2020 at 09:06 AM, Rudolf Schaffer wrote:

i thought to use it as a RF generator. I split the output (Mini-Circuits device 2 ways splitter) in 2 outputs;

one is used as the RF signal source (~-3dB loss) and the second output go to a frequency meter, with a G3RUH GPSDO

as reference. As a "CW" command is not available in nanovna-saver, i used the "CW" function, entering directly the

desired frequency "manually" into the nanovna.
========================================

Rudi,
That set up will work O.K. below 300 MHz where only fundamentals are used, but at 300 MHz and above, where harmonics are used, you may need a 300 MHz high pass filter. At 300 MHz the fundamental at 100 MHz is 15 dB higher on my NanoVNA.

- Herb
Re: What apps use Touchstone files? #applications

 

BTW, I created a guide for nanoVNA users to use QUCS here
Re: What apps use Touchstone files? #applications

 

QUCS studio has a simulation block that accepts Touchstone files. It's the closest free software to ADS.

I suspect you can also load them into the free demo CopperMountain VNA software.
Re: VNA Calibration Reference Box #calibration

 

Here are some tips for those that may wish to duplicate this box design which has a front panel size of 92mm x 38mm:

- The hole centers for the two end connectors, "L" & "THRU" are 15mm from the ends.

- The "SOL" connectors are center-to-center spaced 20mm apart.

- This leaves about 22mm between "Thru" & "S" connectors.

- Needless to say the holes are centered on an end-to-end center line between the panel sides.

- All the holes have a diameter of 1/4 inch (6.35mm).

- The "THRU" connector socket nut was centered in place for epoxy welding by using it to temporarily mount a spare SMA connector in the hole. I chose to install a nut as opposed to threading the relatively soft aluminum with a 1/4" x 36TPI tap as the panel thickness is quite thin. As the knurled connector barrel threading does not extend all the way to the grip disc there is a gap in the thread where it passes through the panel. Thus when tightened in the socket there would be few if any threads engaged without a backing nut. In preparation for epoxy welding the socket nut I roughen the inside surface of the panel around the hole using a sand paper tool in my Dremel.

--
Enjoy!
Tom, VA7TA
Re: Nanovna on Zorin OS

Nigel Gunn, G8IFF/W8IFF
 

GIT is not recognised by many distros until you install it.
Zorin is based on Ubuntu so try:
sudo apt install git
Nanovna on Zorin OS

 

Hi!
I am new in Linux and use Zorin OS 15.
I tried to install NanoVNA-Saver, but git command is not recognized at terminal. Python is installed.
Is there any tutorial available about installing on Zorin OS?
Thanks in advance for any help.
Dark Mode

[email protected]
 

I would like to see a DarkMode version of NanoVNASaver
I adjusted the Chart Colors, but there are no options for adjusting the control background colors
Re: out of "Presentation on the NanoVNA for the raileigh Radio Society", Now: "False Return Loss Calculations"

 

Thanks, Alan - wonderful source ! I love it. You made my day!

Congrats for having shown this. I can only agree.

From it's second very basic formula, (when leaving alone the '(db)',)
it is possible to derive the correct |Gamma| formula, as is used in the first one.

Resulting is:




with L for Load and S for Source, the asterisk meaning conjugate complex.

Just one little remark - knowing we cannot easily change words everybody uses:

The "incident" and "reflected" power is found on a transmission line.

At a complex impedance termination of a complex impedance source,
there is nothing reflected, however.

The power difference, instead, is that between "available" (but not always fully used)
real power and the real power actually delivered to and dissipated in the load¡¯s real part.


In which exact IEEE document did you find it?
When was that published? Where and how can I get a copy?


Why does the probably best Smith diagram program available today,
(that I do not want to name in this context,) when using a complex source,
ignore the IEEE quote and rather stick to that false ATIS like formula?

Why does ATIS not change the false one? I think, time has come to do so.

Thanks again Alan - for this, it's the best source I ever was shown so far !


73, Hans
DJ7BA






-----Urspr¨¹ngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von alan victor
Gesendet: Dienstag, 2. Juni 2020 18:31
An: [email protected]
Betreff: Re: [nanovna-users] out of "Presentation on the NanoVNA for the raileigh Radio Society", Now: "False Return Loss Calculations"



On this return loss discussion... sorry can't help myself...



See the attached. Hope that clarifies... again.



Alan











--
Diese E-Mail wurde von Avast Antivirus-Software auf Viren gepr¨¹ft.

image001.png

Re: PC software with "CW" function SOLVED with avvidclif's freq command !

 

One additional observation:

If I pause the sweep and select the CW freq, there is no output until I un-pause the sweep.
However, I can then pause the sweep again and the output remains on.

On Tuesday, June 2, 2020, 12:47:37 p.m. EDT, Larry Rothman <nlroth@...> wrote:

Rudi,
I don't understand the problem you are having with your nanovna-H.
I have a current version of firmware on my nanovna and under the stimulus menu, there is "CW FREQ"
The nanovna generates a constant output frequency - even if you press the "PAUSE SWEEP" button.
As an RF generator, you will need to contend with all the harmonics as the Nano outputs a squarewave.
regards,Larry

? ? On Tuesday, June 2, 2020, 12:07:07 p.m. EDT, Rudolf Schaffer <rudolf.schaffer@...> wrote:

Dear OM Gyula,

For antennas measurements including feeders, filters, etc,? i'm using my
NanoVNA-H connected to nanovna-saver in the shack. For direct antenna measurement, i'm using the VNA in
"mobile" mode, tnx to the internal battery.

As i'm not equipped with a RF generator and after measuring the RF
output of the NanoVNA, (not too bad hi !) i thought to use it as a RF generator. I split the
output (Mini-Circuits device 2 ways splitter)? in 2 outputs;

one is used as the RF signal source (~-3dB loss) and the second output
go to a frequency meter, with a G3RUH GPSDO as reference. As a "CW" command is not available in nanovna-saver, i
used the "CW" function, entering directly the

desired frequency "manually" into the nanovna. I asked via the group, if
an other solution was possible and i received answers with 2 possibilities: -1- Using a null span sweep centered on
the desired frequency and -2- Sending, with PuTTY

free software, the " ch> freq {frequency value in Hz} to the same COM
port after shutting down the nanovna-saver software.

This is all the "story" and without the help found in the group, i would
be still obliged to enter the frequency using the "CW" function described in the NanoVNA-H user Menu Structure paper
furnished with the VNA.

With my best 73,

Rudi, HB9ARI

Le 02.06.2020 ¨¤ 10:56, Gyula Molnar a ¨¦crit?:
Dear Rudi,
you started the "PC software with" CW "function" topic.
Shouldn¡¯t other similar, related information be written in the same topic?
Slowly there will be 14,000 entries in this group, I think this is a record!
Don't break up what you have to say, please.
Thank you for your attention

73, Gyula HA3HZ

PC software with "CW" function SOLVED with avvidclif's freq command !
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