开云体育

Rob,
Your question was answered in the other topic where you asked it. Duplicating questions in different topics is bad etiquette.

Herb

Pluto,
Hugen retailed the first NanoVNA based on edy555's open source design. It is the hardware version that is currently being marketed by all NanoNA clone manufacturers. In response to a request from edy555, Hugen has changed the name of his unit from NanoVNA. to NanoVNA-H to distinguish it from the other clone units. Hugen has said he will be offering an updated unit in mid October that has a case but the hardware design appears to be unchanged. A NanoVNA-H V2 is slated for release in 2020. Search this board for "NanoVNA-H V2" for info on it. A RTOS version, called the NanoVNA-F is now being sold, but it is a different beast.

Herb

I would like to update my NanoVNA 2.8"TFT with the Gecko-logo, color whide.

1) Where I find the flash-program?
2) Which files should I use for to clean (Only DMR-CLEAR_MEMORY_DFU.dfu?)?
3) Which firmware version do you recommend?

Info Hardware:
Kernel: 4.0.0
Compiler: GCC 5,4,1 20160919
Architecture: ARMv6-M
Core Variant: Cortex-M0
Port Info: Preemption thorough NMI
Platform: STM32FxB Entry Level Medium Density devices
Board: NanoVNA
Build time: May 5 2019 - 80:35:00

Thanks
Rob

Rob,
The DMR-CLEAR_MEMORY_DFU.dfu writes "FF" to each memory location and is only used to clear memory prior to loading a new firmware. Larry has been kind enough to put all the current and past firmware at : /g/nanovna-users/wiki/home under the "Firmwares" section.

Links to the flash utility and instructions for it's use, as well as various other user guides, can be found here: /g/nanovna-users/wiki/User-Guides .

The Wiki and Files sub section of this group are a great resource and will answer a lot of questions for any new user of the NanoVNA.

Herb

Hello everyone !
Is there anyone who can clarify the hardware versions?
To my knowledge, the first version is that of ttrftech (edy555) .
Subsequently the version of hugen79 was introduced .
Which version is sold now? I imagine that of hugen79. Is the ttrftech version still on the market?
And are there others?

Diego - I8TIF

What files should I use?
Only DMR-CLEAR_MEMORY_DFU.dfu ?
Where I find the flash-program?

I would like to go around my NanoVNA 2.8"TFT with the Gecko-logo, color whide.
Info Hardware:
Kernel: 4.0.0
Compiler: GCC 5,4,1 20160919
Architecture: ARMv6-M
Core Variant: Cortex-M0
Port Info: Preemption thorough NMI
Platform: STM32FxB Entry Level Medium Density devices
Board: NanoVNA
Build time: May 5 2019 - 80:35:00

Thanks
Rob

Jim,
Larry pulled his original PDF document in favor of this link, /g/nanovna-users/wiki/shellcommands .

Herb

What files should I use?
Only DMR-CLEAR_MEMORY_DFU.dfu ?
Where I find the flash-program?

I would like to go around my NanoVNA 2.8"TFT with the Gecko-logo, color whide.
Info Hardware:
Kernel: 4.0.0
Compiler: GCC 5,4,1 20160919
Architecture: ARMv6-M
Core Variant: Cortex-M0
Port Info: Preemption thorough NMI
Platform: STM32FxB Entry Level Medium Density devices
Board: NanoVNA
Build time: May 5 2019 - 80:35:00

Thanks
Rob

On Wed, Sep 25, 2019 at 12:17 PM, Larry Rothman wrote:

Markers: outputs: marker#, index#, frequency. What is the 'index' number

Index is the number of the point [0-100]

Capture: this is a new command. What does it do? If you run it in the console,

Dumps the screen content so you can make a "screenshot"

Sample: samples gamma, ampl or ref - how is it used?

sampe [gamma|ref|ampl]
select the data to be measured:
gamma: amplitude / reference signal, this is what you want, do not use the others
ref: measure the absolute strength of the reference signal
ampl: measure the absolute strength of the bridge/CH1 signal

Time: is still there and increments the counter - but how can it be set to

Can not be set, it is the Linux "time" command
Usefull only if you have a RTC in the system

DAC: does the dac variable control the DSP gain

No, it seems to set the output voltage of an analog output of the STM
The adc gain is automatic set depending the selected frequency

If you want to build a clone of the sdr-kits *Testboard*,
and have no experience with the *2.54 mm round Female Pin Header Socket*,
here a link to a cheap source:
$ 1.33 for 5 x 40 pin sockets


You can use those *pin sockets*
also as *pin headers*, and also as a *carrier for parts to measure*,
either by plugging in, or soldered.

So, they are very universal to use.

A good explanation for a 68 pF capacitor measurement with the nanoVNA:
/g/nanovna-users/message/3865

73, Rudi DL5FA

Thanks Brian,
It shows that you cannot arbitrarily use any sweep parameters, like what I did in my fist attempt (50K-300MHz).
I'll be making more measurements...
Paul

Thanks Larry, but I already mentioned in my post that I fully calibrated the VNA with the fixture attached.

What good does that do?
Mike WY6K


"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."

Larry, I can't find the Console Command pdf New name? Folder?
Thanks,
Jim, KA6TPR

maybe it is time to start using hash tags #component #measurement. first person to start a thread puts #hash #tag in the subject line

Here is some more stuff to contemplate.

I "modeled" so to speak the inductor under test, the DUT, as a perfect inductor. No SRF.

I added the measured fixture parasitic obtained from the "perfectly calibrated VNA". I cascaded these elements into the simulator and as expected, looking into the VNA port, port 1, we return a S11 and an equivalent parallel inductance of 1.3 uH. As measured our 1 uH inductor appears as a 1.3 uH inductor and reasonably constant at low frequencies as long as we stay well below the SRF... Huh! What SRF? I stated the SRF of the inductor was NOT present. Well, it is not, but the fixture has created its own! Namely the 10 pF fixture C shunts the 1 uH and there is a MEASUREMENT SRF introduced. Proper de-emdedding if you keep your wits together will permit you to get the proper answer right through and past the resonate point introduced by the FIXTURE! This example exemplifies how KEY fixture details are and if not considered, will render measurement error.

Alan

Take a look at this:



I've ordered a $18 SOL kit from ebay. I'll be adding comparisons to the Anritsu to the thread when they come in. I'll drag the 8753B to where I can power it up for that. So I'll have TDR to 20 GHz and VNA to 3 GHz.

The more I use my Tek 11801 the more I wish that there was a cheap sampling scope that would work with one of Leo Bodnar's pulsers. While the 20 GHz of an SD-24 or SD-26 would be very difficult to match, one might be able to get to 5-6 GHz with a clever design which was cheap to make using modern parts.

The great thing about the time domain is you can tell which part in a series of connectors is doing what.

Have Fun!
Reg

On Fri, 4 Oct 2019 at 00:49, sala nimi <sala.nimi@...> wrote:

I had some time and tested some terminators for fun. I thought that
commercial terminators are nearly perfect, but not mine. I have a N
terminator perhaps from Digikey, and It was worse than my very old self
made terminator from UKW berichte or VHF communication. Homemade terminator
was dot or comma in the Smith chart but commercial one had a clear arc.

But so much depends on what you use to perform the calibration with. To
take an extreme example

* 50 ohm system
* Load used for calibration has an impedance of 30 ohms
* DUT #1 is a resistor of 49 ohms
* DUT #2 a resistor of 31 ohms.

Although the 49 ohms resistor has a much better return loss in a 50 ohm
system than the 31 ohm resistor, the VNA would indicate the opposite
because it was calibrated with a load close to DUT #2.

It is very easy to fool yourself with VNA measurements.

Dave

--

Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...

Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United
Kingdom

On Fri, Oct 4, 2019 at 02:49 AM, sala nimi wrote:

Homemade terminator was dot or comma in the Smith chart but commercial one had
a clear arc.

probably it just means that you calibrated your VNA with bad terminator. So, now it shows good terminators as bad, because they are not bad as one which is used for calibration :)

I had some time and tested some terminators for fun. I thought that commercial terminators are nearly perfect, but not mine. I have a N terminator perhaps from Digikey, and It was worse than my very old self made terminator from UKW berichte or VHF communication. Homemade terminator was dot or comma in the Smith chart but commercial one had a clear arc.