开云体育

Hello Roger

Thanks for the answer.
I tested clear config and restart with 1.2.00, no luck. (i reduced the sweep points to 51 and it took "only" about 20 sek for a sweep, but no useful readout connected to my DemoKit 6.5MHz BSF)

Then i saw in the vna beta group, that there is a 1.2.02 version.
I installed it and heureka, it sweeps even faster, than 1.0.53.
I also have a useful signal at S11. (I actually need it as a signal generator to do some tests on my (tr)uSDX 5-band | multimode TRx | 5W | QRP)
I'm happy again ;-)

Thomas

Hi Ed,
Just returned home...don't have an nVNA handy...
There are 2 questions on the table.

1. What does the H4 show for FORMAT > LINEAR?
ans: LINEAR - Magnitude (absolute value) of Sxy.
That's if I recall correctly.
That's why the Linear col in the spreadsheet calculates | S11 |.
The user manual is an attempt to lay out for folks what the H4 is doing...for example, when I first saw LINEAR, I wondered what that could be. I don't associate the word "linear" with "absolute value", "Euclidean norm", or "p-norm", where p=2. So I took a data set, and, using the same data (not scanning), changed the formats to see what they displayed.
I /think/ that if someone fires up an H4 and sets the display format to LINEAR, they will find it is | S11 |.
If that turns out to be the case, then right or wrong, that's what LINEAR means in an H4.

2. What does "one_port.pdf" say?
Well, to begin with, not the point. The point is to document what the H4 is doing, whether or not it is doing it correctly.
Then..."one_port.pdf" says
Just as for the Return Loss, the VSWR (dimensionless) is calculated from rho...(11)
where 1+rho = 1+| S11 |
seemingly suggesting that rho is the magnitude of S11.
I havna really read the doc...

I welcome discussion...

On 05/06/2022 18:09, Siegfried Jackstien wrote:

hi Roger
a table with ALL of them to compare would be superb
.... aehem ... 7 inch screen size?? what model is that??
dg9bfc sigi

For example:



JNCRADIO SV4401A - 4.4G VNA WITH 7'' CAPACITIVE TOUCHSCREEN

Sysjoint.

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

hi Roger

a table with ALL of them to compare would be superb

.... aehem ... 7 inch screen size?? what model is that??

dg9bfc sigi

Am 05.06.2022 um 19:02 schrieb Roger Need via groups.io:

On Sat, Jun 4, 2022 at 08:28 AM, Vince Loschiavo wrote:

I would like to purchase a later version of the nanoVNA.
Which vendor does everyone recommend that has the latest?
thanks

There are many "NanoVNA" products on the market - NanoVNA-H, NanoVNA-H4, NanoVNA-F, LiteVNA, LiteVNA64, LibreVNA, NanoVNA SAA2, NanoVNA-F V2, SV4401A, V2Plus, V2Plus4 and several more....

What is best for you depends on your requirements in terms of budget and specifications.
- standalone or PC required to operate
- maximum frequency of interest
- dynamic range of S11 and S21
- screen size (2.8", 4" or 7")
- connector type (SMA or N connector)
- metal or plastic case
- measurement capability (antenna measurements only or measuring components, filters etc. )
- product support (documentation, manuals, user groups)

There is no table comparing all the products on the market. If you let us know what you want after considering the above we can point you in the right direction.

Roger

Hello Rich:

As a kid in the 50s, I was K1CJO, one end of whose single wire fed windom was actually suspended by a tree that eventually fell into the Piscataqua River in Eliot, Maine, to the delight of the neighbors, with whom I had WATV sets.

In any event, rainy day in Sausalito led me back into your spread sheet, and noticed an errata I pass along.

Your cell “M4” states value of RLdB = 35.9176dB

Formula for cell “M4” shows = 20 x log10 (0.16), which actually calculates to 20 x (-0.79588) = -15.917 dB

If you were trying to show Return Loss, that would be calculated by:

RL dB = 20 log10(1/rho) or 20log10(1/ Is11I)

using your cells

RL dB = 20 log10(1/G4 or 1/M4)
= 20 x log10( 1/.33735) = 20 x log10(2.9643)= 9.438 dB

Small fix.

Plants like the rain.

73

Ed McCann
AG6CX

It ain’t.



Ed McCann
AG6CX

It ain’t.



Ed McCann
AG6CX

Also recently purchased from AURSINC (a -H) and all was as expected.

Tim K1BR


On Sat, Jun 4, 2022 at 4:18 PM Rich NE1EE <TheDustyKey@...>
wrote:

On 2022-06-04 08:28:-0700, you wrote:

I would like to purchase a later version of the nanoVNA.
Which vendor does everyone recommend that has the latest?
thanks
Vince

I have had good experiences with several purchases from AURSINC. -H, -H4,
RF Demo Kit, etc. I have purchased from them for 2 years.

~R~

I recall when first setting up my nano vna to use the pc based options, being stuck in the wrong driver loop.?Windows would insist that it had the best driver loaded if I attempted to to an update driver. Yet, at the same?time device manager showed there was a driver issue with the yellow question mark. I used a program?called Zadig which can be downloaded and then used to override this incorrect driver issue. Zadig is oftenused when setting up an rtlsdr. A clear case where windows may tend to load the wrong driver. So, using?the Zadig program, you can force windows to replace the wrong driver with the correct one? Once you do?that, windows will be happy, and the device will work properly. .At least that was my experience. Certainly,?a contributing factor was the definitely defective USB to Nano VNA cable that came with the new Nano VNA.

On 2022-06-04 10:40:-0700, you wrote:

Looking at formulas on the spreadsheet, "Linear" ( Column G) contains the absolute value (magnitude) of S11,

The user manual states that it is the | S11 |. I think that "Linear" is a bit of a misnomer, but it is what it is until it ain't.

~R~

On 2022-06-04 08:28:-0700, you wrote:

I would like to purchase a later version of the nanoVNA.
Which vendor does everyone recommend that has the latest?
thanks
Vince

I have had good experiences with several purchases from AURSINC. -H, -H4, RF Demo Kit, etc. I have purchased from them for 2 years.

~R~

Linear simply means the conversion of dB to linear units. i.e. 10^(dB/10) or maybe 10^(dBV/20)
Gary
W9TD

Wading through file I have not been able to find what variables "Linear" and "SWR Linear" mean.

Looking at formulas on the spreadsheet, "Linear" ( Column G) contains the absolute value (magnitude) of S11, IS11I, which is in polar terms the magnitude "rho", as used in the polar notation for Gamma (or reflection coefficient) Gamma= rho * Angle Theta. One might replace "Linear" with "Rho".

"Rho" is used to calculate "Return Loss," being defined as RL= 20log(1/rho)

Rho is also used in the VSWR calculation: VSWR = (!+ Rho)/(1-Rho)

As far as SWR:Linear is concerned (column H), the formula indicates it is the the SWR Value (column F) divided by 10 x "linear" or "rho".
I've never seen that description (SWR:Linear) in practice or use, but a new dawn rises daily.
Can anyone shed light on what this ration SWR:Linear might be used for?

Ed McCann
AG6CX

Maybe you have a wrong Windows 10 driver.
You have to start NanoVNA in DFU Mode.
After connected, you have to see it as "STM Device in DFU Mode" in Controller USB (Device Manager).
The right driver that works for my Windows 10 is: STTub30.sys (3.0.6.1 04/26/2018)
You can update it searching in this path:
C:\Program Files (x86)\STMicroelectronics\Software\DfuSe v3.0.6\Bin\Driver\Win10

Sergio, IK6QRE

I would like to purchase a later version of the nanoVNA.
Which vendor does everyone recommend that has the latest?
thanks
Vince

I believe the bootloader device is correctin dfu mode . . . dfu is definitely different than "normal" run mode that is a COM device.

--
Sent from my Android device with K-9 Mail. Please excuse my brevity.

Thanks for all the info.
It currently works well for what I'm doing...so i might leave well enough alone.
Not worried about doing firmware upgrades, my rigs get regular updates..
did have a bit of an issue loading driver, (win 10 64bit)
looks like the port is good as it comes up with STMicroelectronics Virtual COM port fine
when i go to DFU, it comes up in other devices as a STM32 BOOTLOADER..it doesn't show up as STM Device in DFU Mode
Tried to load the 32 bit driver just in case but it didn't want me to...Ha..
I'll do some more looking, as Device Mangler has the yellow triangle and exclam and installing DfuSE_Demo didn't help
I'll keep at it..
thanks again
Vince

On Fri, Jun 3, 2022 at 01:56 PM, A DeCarmo wrote:

I am able to enter into DFU mode from the menu of the NanoVNA
following the instruction in the Absolute Beginner's Guide on
page 45 , But when I start DfuSe Demo nothing shows on the Available DFU
Devices
menu Block.

Using Windows 10 Operating system
System shows NanoVNA using STMicroelectronics Virtual Com Port
(COM3), but when I put the device in DFU mode, virtual com port disappears
any help with this problem will be greatly appreciated.

There is a special DFU driver required when you want to update the firmware using DFUSe demo or NanoVNA app. When you install DFUSe demo this driver gets installed. When you put the NanoVNA in to DFU mode and connect it to the PC you will see the driver under USB devices (NOT ports) in Device manager and your COM3 virtual COM port will disappear.

The Absolute Beginners Guide is a good reference on how to update the firmware. Read it carefully and don't skip a step....

Roger

The first (simplest) thing I'd check is the USB to USB-C cable. The one I
got with my NanoVNA was bad. I bought one from a reputable source and it
worked.

Zack

On Fri, Jun 3, 2022 at 3:56 PM A DeCarmo via groups.io <wce4=
[email protected]> wrote:

Hello everyone in NanoVNA land
Newbie here Having trouble upgrading firmware from
v0.2.3-2-g8ac9166 date of the build was oct 18, 2019
to the latest firmware.
I am able to enter into DFU mode from the menu of the NanoVNA
following the instruction in the Absolute Beginner's Guide on
page 45 , But when I start DfuSe Demo nothing shows on the Available DFU
Devices
menu Block.

Using Windows 10 Operating system
System shows NanoVNA using STMicroelectronics Virtual Com Port
(COM3), but when I put the device in DFU mode, virtual com port disappears
any help with this problem will be greatly appreciated.