开云体育

The file you want is NanoVNA-App.rar. It is a rar archive, which is similar to a ZIP.

73

-Jim
NU0C


On Sun, 14 Feb 2021 16:49:46 -0800
"paul kobetz" <pkobetz@...> wrote:

Roger TU for the reply I wish i understood what you are referring to? I went to the OneofEleven site and it is in GitHub I dont see an executable file which I could run.

Forgot to ask, what's this legendary piece of equipment,
it has transistors so it can't be that good ?

Not the one on the right. See my previous post.

73

-Jim
NU0C

On Mon, 15 Feb 2021 03:14:37 +0100
"Dragan Milivojevic" <d.milivojevic@...> wrote:

In parallel with a 10nF cap ...

On Mon, 15 Feb 2021 at 03:02, Jim Shorney <jshorney@...> wrote:

And yet here we have two electrolytics in an RF circuit in a legendary
piece of ham gear. I asked an actual rocket scientist about it and he
didn't think it was anything unusual.

73

-Jim
NU0C

On Mon, 15 Feb 2021 00:55:06 +0100
"Dragan Milivojevic" <d.milivojevic@...> wrote:

That makes no sense whatsoever.

On Sun, 14 Feb 2021 at 23:14, Manfred Mornhinweg <manfred@...>

wrote:

And what's the best bypass cap? Well, a single, plain, cheap aluminium
electrolytic!

Attached is the impedance plot for a 47?F, 25V electrolytic cap,

measured

with lead lengths compatible with mounting it snugly on a PCB. Their

narrow

pin spacing helps a lot in keeping their ESL low. I kept the same

scale to

make comparison easy.

YES, a single 47?F electrolytic is a much better bypass cap than a
parallel combination of two ceramic caps of different values! Even in

the

low VHF range!

The problems with electrolytic caps is that their ESR rises with age,

and

rises much faster if they run hot, or if they have to carry large

ripple

current. So they can't be applied in every situation. But in situations
that are kind to them, they are the cheapest and easiest way to get an
excellent wideband bypass.

Yeah, I remembered that about the one on the left after I sent the pic. The one on the right he called a "buzz kill".

73

-Jim
NU0C

On Mon, 15 Feb 2021 02:07:44 +0000 (UTC)
"Bob Albert via groups.io" <bob91343@...> wrote:

The left hand one is bypassed with a .01 so that doesn't count.? I am puzzled by the other one; what's it supposed to do?

In parallel with a 10nF cap ...

Can you connect to the NanoVNA-H with the NanoVNA Sharp program? Do a calibration and remember to press Reset before you start and Done when you are finished. Save to a slot like 4. Then see if you can get the short, open and load on the left, middle and right of the Smith chart in the Sharp program. This will at least let you know if the NanoVNA can work in PC mode. If that works see if you can measure something in the sharp program.

The NanoVNA can be sent commands over the USB connection if you have a terminal program like Teraterm or Putty installed on your computer. This is called console mode. You just install TeraTerm which is free and then connect to the NanoVNA over the COM port. You can then send it commands like Clearconfig 1234. Search the Wiki for this group, previous messages and the files section of this group for further discussion of console mode.

Roger

The left hand one is bypassed with a .01 so that doesn't count.? I am puzzled by the other one; what's it supposed to do?

And yet here we have two electrolytics in an RF circuit in a legendary piece of ham gear. I asked an actual rocket scientist about it and he didn't think it was anything unusual.

73

-Jim
NU0C

On Mon, 15 Feb 2021 00:55:06 +0100
"Dragan Milivojevic" <d.milivojevic@...> wrote:

That makes no sense whatsoever.

On Sun, 14 Feb 2021 at 23:14, Manfred Mornhinweg <manfred@...> wrote:

And what's the best bypass cap? Well, a single, plain, cheap aluminium
electrolytic!

Attached is the impedance plot for a 47?F, 25V electrolytic cap, measured
with lead lengths compatible with mounting it snugly on a PCB. Their narrow
pin spacing helps a lot in keeping their ESL low. I kept the same scale to
make comparison easy.

YES, a single 47?F electrolytic is a much better bypass cap than a
parallel combination of two ceramic caps of different values! Even in the
low VHF range!

The problems with electrolytic caps is that their ESR rises with age, and
rises much faster if they run hot, or if they have to carry large ripple
current. So they can't be applied in every situation. But in situations
that are kind to them, they are the cheapest and easiest way to get an
excellent wideband bypass.

Paul,
Make sure you didn't turn OFF the calibration on the unit. In the calibration menu there is an Apply checkbox...make sure it's checked. However, with that said, sometimes it flips a bit and if you uncheck the box, calibration turns back on.?
Have a look.?


On Sun., 14 Feb. 2021 at 7:05 p.m., paul kobetz<pkobetz@...> wrote: My beautiful unit suddenly started to just start drawing lines all over the screen? I hv recalibrated it several times.. Something is wrong as it was working fine. Question is there a reset ?? Is there a repair facility or is it just disposable ??
Thank You Paul Kobetz K2HZO? Rubicon Observatory, Ukiah, Ca

Found a better YouTube video that describes the limits as a spectrum analyzer:


73
Evan
AC9TU

On Sun, Feb 14, 2021 at 03:59 PM, Bob Albert wrote:

I have measured electrolytic capacitors with my nano and they are woefully
bad at high frequencies.? Now that I have acquired a nanoVNA that can go down
to 10 kHz I plan to do some testing to see if they are just as bad at that
frequency.
Bob

Bob,

I thought you might find this interesting. I took a small Siemens 10 uF 40V electrolytic and made some measurements on a DE-5000 RLC meter and compared them with the NanoVNA. At 10 kHz. and 100 kHz. The results were very close. Most manufacturers rate their electrolytics at 100 or 120 Hz. so these measurements are in the table below.

You can see on the plots that this one went into self resonance at 420 kHz which is low and probably due to the fact that I left the leads at 1 inch long.

Roger

Here is a YouTube that shows how to use the NanoVNA as a spectrum analyzer.


So it can be done, but the results are not usually good enough to ensure emissions compliance. It is not really designed for this use. You must also limit the power input to very low values. I do not know the specifics but would assume less than +20 dBm or 100milliwatts. Anything higher would cause damage.

73
Evan
AC9TU

NWDZ board, like it says in the graphs. All calibrated on the same board with a single cable, as stated. And results were repeatable; I ran it several times. Are the board standards 100% accurate? Who knows? But the results were remarkably consistent over specific ranges.
--
Ed K9EK

Maybe, but even at the low price, I can't see someone blowing up the device
if we could prevent it.

However, as I've stated before, experience is the best teacher.

Dave - W?LEV

On Mon, Feb 15, 2021 at 1:00 AM Dragan Milivojevic <d.milivojevic@...>
wrote:

Spoilsport ?

On Mon, 15 Feb 2021 at 01:31, David Eckhardt <davearea51a@...>
wrote:

To put things very bluntly, the NANOs have no place around a transmitter,
even 1 watt. It's circuitry without power, yes, but not at power.

Dave - W?LEV

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

Spoilsport ?

Roger TU for the reply I wish i understood what you are referring to? I went to the OneofEleven site and it is in GitHub I dont see an executable file which I could run. Darn, Your knowledge far exceeds mine.. Can you be more explicit? The Clearconfig 1234 same comment I am using Nanovnasharp.zip which becomes Nanovna.exe and is a great program It doesnt seem to hv a clear function ..
thank you Sir
Paul Kobetz
K2HZO
Rubicon Observatory

Ed,

In a previous post I asked you which RF Demo board you were using. I took a look at both models that are being sold and from the photos it looks like one has a better layout of the cal loads for open, short and load. Layout and parts placement will affect the reference plane. Photo attached.

Roger

To put things very bluntly, the NANOs have no place around a transmitter,
even 1 watt. It's circuitry without power, yes, but not at power.

Dave - W?LEV

On Sun, Feb 14, 2021 at 6:46 PM Dragan Milivojevic <d.milivojevic@...>
wrote:

I say go for it, 1.2W is nothing and the soldering lesson you will get
afterwards
will be a great learning experience.

On Sun, 14 Feb 2021 at 19:00, Cierra <dubosec@...> wrote:

Well, the radio is a QRP Pixie kit and it doesn't put out very much

power;

I just wanted to test if I soldered the connections well. I have an

analog

multimeter I could use as well. Eventually I plan to get (or make) a

dummy

load, but I'm still practicing my soldering for now.

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

Have you tried a Clearconfig 1234 from the USB Console using TeraTerm or the OneOfEleven NanoVNA app? It is discussed in the Wiki for this group. Once cleared do a Touch Cal, test Touch Cal and then Save. Go and do a full calibration and save to slot 0.

Roger

My beautiful unit suddenly started to just start drawing lines all over the screen I hv recalibrated it several times.. Something is wrong as it was working fine. Question is there a reset ?? Is there a repair facility or is it just disposable ??
Thank You Paul Kobetz K2HZO Rubicon Observatory, Ukiah, Ca