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As stated, the purpose of placing the second 50 ohm load on port S21 is to improve the isolation calibration.

The next best thing (which is fine) is to put the open SMA calibration connector on the S21 port during isolation calibration. This will reduce possible interference from an outside source. Having a 50 ohm external load on S21 will lower the net impedance on S21 input and may slightly reduce RF leakage across the PCB board from the S11 port. Since there is internal resistor padding on the S21 input this effect is small.

Beside interference reduction, the other benefit of a 50 ohm termination is to provide input termination to represent nominal input thermal noise level to S21 port. With the internal resistor attenuator padding on the S21 input this external 50 ohm termination has little effect on NE612 input noise termination, so the open load connector is fine to shield the input.

Hi,

If one has that basic soldering skills you could build these for less than
4USD, specially if you just build the test fixture.

Cheers!



A sábado, 18/04/2020, 11:43, hwalker <herbwalker2476@...> escreveu:

Я получил прибор в России, доставка из Китая две недели!

Thanks, that looks great

How do you calculate complex choking impedance?

Cheers!



A sábado, 18/04/2020, 10:44, Aleksander Shalygin <shalygin@...>
escreveu:

A VNWA like Testboard kit is being sold as an accessory for the NanoVNA on AliExpress for $10.00 usd (currently offering 5% discount). Assembly is required so some basic soldering skills are needed.



I prefer this testboard to the RF Demo Kit For NanoVNA because of the sma connections.

- Herb

My experiments.

Hi Run

I did not realize before now you bought a nonoVNA ?

Kind regards

Kurt



-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Ron
Sendt: 18. april 2020 03:37
Til: [email protected]
Emne: [nanovna-users] Just Bought nanoVNA



Hi, I'm Ron WA0RJ.



I just ordered a nonoVNA which will arrive in a few days. I'm looking for advice concerning what to install on my laptop to use the device from the computer. Anything else I can do to get ready to become familiar with it will be appreciated.



Thanks!

Hi Run
Go to the homepage of Gun thard Kraus and read his excellent document about NanoVNA and the program NanoVNA-saver which is a must to install
NanoVNA-saver to find on
Just install it even before the NanoVNA arrives and study it
You will also find links to other software but the do not "beat" the NanoVNA-saver
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Ron
Sendt: 18. april 2020 03:37
Til: [email protected]
Emne: [nanovna-users] Just Bought nanoVNA

Hi, I'm Ron WA0RJ.

I just ordered a nonoVNA which will arrive in a few days. I'm looking for advice concerning what to install on my laptop to use the device from the computer. Anything else I can do to get ready to become familiar with it will be appreciated.

Thanks!

I actually prefer the software, although it's true that if I were on the
roof, I'd prefer not to have a computer dangling.

but in the shack, the ability to view and save and "mouse around" the
images, and set different parameters and resweep quickly is nice.

73, Tim KA4LFP



#######
“Men who ally themselves with the darkness are selfish and greedy, seeking
power and dominion over others for their own glory, always self-promoting
their own deeds, seeking loyalty and surrounding themselves with sycophants
and denigrating and dismissing those who speak truth to them.
Those qualities are inextricably linked with cowardice and an inability to
trust others. Such men can only lead through lies, bullying, fear,
intimidation, and deception. Thus, ultimately their followers, hangers-on,
and their allies always inevitably betray them, as such men also blame
their followers, because they are selfish and greedy themselves.
"

I just got a new Nano VNA and I see stuff on YouTube but I'm not sure where
to start.

Later

Don va7dgp/va7qu

On Fri., Apr. 17, 2020, 7:05 p.m. Bob Albert via groups.io <bob91343=
[email protected]> wrote:

I think the software runs on most Windows iterations. I think it's
nanosaver. Read the blurb that comes with the unit.
NanoVNASaver | NanoVNA

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|
| |
NanoVNASaver | NanoVNA

NanoVNASaver is developed by Rune B. Broberg. It is a multiplatform tool
to save Touchstone files from the NanoV...
|

|

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Bob K6DDX
On Friday, April 17, 2020, 06:59:07 PM PDT, Ron <
rkjewett@...> wrote:


Thanks, Bob!
BTW, my laptop is Windows 7
--
Ron
WA0RJ

So who was telling the truth? The nanoVNA or the SWRmeter?
If the driven element was 2 cm too long, then the nanoVNA was right when it said that resonance was at 142 MHz?

On 4/17/20 7:05 PM, Bob Albert via groups.io wrote:

It is a multiplatform tool to save Touchstone files from the NanoV...
|

???? And so much more!? It also allows you to do sweeps with as many points as you like, as opposed to the 101 point limit on a standalone NanoVNA.

I think the software runs on most Windows iterations.? I think it's nanosaver.? Read the blurb that comes with the unit.
NanoVNASaver | NanoVNA

|
|
| |
NanoVNASaver | NanoVNA

NanoVNASaver is developed by Rune B. Broberg. It is a multiplatform tool to save Touchstone files from the NanoV...
|

|

|






Bob K6DDX

Thanks, Bob!
BTW, my laptop is Windows 7
--
Ron
WA0RJ

I started with a program called nanoSaver or similar name.? But then I decided I'd rather use the nano by itself.? The display isn't that small and it's a lot nicer not having a cord dangling.
Bob K6DDX

Hi, I'm Ron WA0RJ.

I just ordered a nonoVNA which will arrive in a few days. I'm looking for advice concerning what to install on my laptop to use the device from the computer. Anything else I can do to get ready to become familiar with it will be appreciated.

Thanks!

Hello Al,

Yes, the procedure that is created in that document is based on calibration of the 2 channel, port 0 and port 1, with the supplied coaxial cables. Yes, the calibration pieces are attached at the end of the cables. Namely short, open and as you noted the kit has but one 50 ohm termination. Completion of the S21 cal requires the two cables to be connected together and so a female - female thru adapter is required. On the isolation, the intent is to minimize radiation or cross talk from CH0 to CH1 when the ISOL key is pressed. For the most part if you leave port 0 (CH0) terminated in 50 ohm and leave CH1 cable end open; I think that will be fine. You might dress the CH1 cable end at least far apart from CH0 cable end, again to minimize stray signal coupling during the ISOL cal process. The whole intent of all this is an attempt to minimize the noise floor present after calibration and maximize the device dynamic range.

Alan

Try 3.5 e6

I have found it:



And you have a part 3... Cheers!

LL

Hello :)

What about part 2?

Cheers.