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Re: nanoVNA-H -Strange behavior with YAGI Ant

 

hello
to be sure is to test as near as possible of the antenna less than one
meter. And afterwards to use the coaxial cable. Depending of the nature and
the length of your cable, you may find very different results! With the
transmitter and the coaxial and the antenna, you test the whole system, not
only your antenna. You can verify this by adding a length of cable and keep
all other parameters identical.
73

F6CNG Olivier

Le jeu. 16 avr. 2020 ¨¤ 09:06, <s_peter@...> a ¨¦crit :

The Setup is 300W output on 144.300Mhz.The Antenna is 11El.long YAGI on
144 Mhz with Gamma Match and aprox.11m.long RG213 coax (8*¦Ë*0.66).
Measured on the coax in the shack.
The SWR with SWR Meter is 1.06 in the range 143.900Mhz-144.600Mhz.Below
and above this range SWR start to rised quick.
nanoVNA-H v.3.3 blu PCB is calibrated perfect - 2 x RG316 cm cables
SO259 to SMA from eBay, SOLT SO259 verifyed (forget for bad
calibration).On the Screenshot Min SWR and the best Return loss are on
142.000 Mhz. ??? .On 142 Mhz the SWR is incredibly high with the SWR Meter!!
IF I retune the Gamma for min SWR on 144.300Mhz and best Return loss with
only nanoVNA...they are: SWR 1.65 (cant achieve less) and Ret.loss -12 db
->Realy bad, but the Screen shot is prety good -:) ...clear hollow
Is that due to the coax in the path ?? Any sugestions ....
Re: Use NanoVNA to Evaluate Unlabeled Toroids?

 

Hi Arie,
Does Nanovna Sharp output a different format than Nanovna Saver? Just looked at an s2p file from sharp. It appears to be the S21 linear and phase angle. The DUT is 15 turns on a high permeability MnZn core. Goes thru resonance about 1.83 to 1.92 MHz as S21 goes thru a minimum and the phase angle switches from a neg angle (inductive) to a pos angle(capacitive). As shown in the attached s2p file.
73, Pete

Gray Mag Inc P material core 15 turns.s2p
Gray Mag Inc P material core 15 turns.s2p

Re: NanoVNA Testboard kit VNA Test Demo Board #applications

 

Well I have ordered parts to make 3 of these for less than 4USD.

And with one of these, I can make different configurations...

[image: image.png]

You are right, the kit its pre-made, but I have time to wait for the parts,
and enough skills to make this during the quarantine between sips of a nice
Portuguese red wine after dinner... ;)


*73 de Lu¨ªs, CT2FZI*

*QRV @ 145.300 MHz | **CQ0VMST (VHF REP Monsanto)*
<>



<>

On Sat, 18 Apr 2020 at 15:27, hwalker <herbwalker2476@...> wrote:

On Sat, Apr 18, 2020 at 04:21 AM, CT2FZI wrote:
...If one has that basic soldering skills you could build these for less
than 4USD, specially if you just build the test fixture...
===============================
Yes,
The parts count are less than 4 usd, but the hassle of ordering the
strip board, headers and sma connectors from one source make purchasing the
kit attractive. The PCB is also much nicer than most of us could produce
using a strip board.The SDR Kits Testboard is twice as much and also
requires assembly. So if you were already considering purchasing that test
board, the NanoVNA Testboard is another less expensive option. I ordered
two and with the 5% discount and $2.00 new user coupon paid less than
$20.00. With the COVID-19 shipping delays I don't expect to see them until
late May, but I'm in no hurry.

SDR Kits has a couple of documents on their website that are a must have
for anyone considering purchasing the NanoVNA Testboard kit:





Proper acknowledgement to SDR Kits for originating the design concept.

- Herb



image.png

Re: Use NanoVNA to Evaluate Unlabeled Toroids?

 

Pete,

Thank you so much for this information and spreadsheet!

Looking forward to use it...!


*73 de Lu¨ªs, CT2FZI*

*QRV @ 145.300 MHz | **CQ0VMST (VHF REP Monsanto)*
<>



<>

On Sat, 18 Apr 2020 at 13:54, WB2UAQ <pschuch@...> wrote:

To calculate the Z of the DUT between Ch0 and Ch1 (using S21 Series
method), I initially used G3TXQ's method after converting from his formats
to what the Nanovna outputs. However, I found an Agilent presentation
"Challenges and Solutions for Impedance Measurements" on the web. The
author described several methods including an S21 Shunt and and S21 Series
method of measuring a device's impedance. I used his general formulas and
converted them to run in Excel. I'll try to attach the spreadsheet.
The G3TXQ method uses an AIM brand instrument that Steve had. He did a
great job of reasoning-out how to calculate the series method. The Agilent
presentation gave us a better form to use and after some tinkering with the
trig I was able to get the formulas to agree:)
I have good results compared against an expensive 4 terminal instrument.
Please let me know how it works out for you. Thanks! 73, Pete
Sorry if some one else already posted something on this.
Re: V2 Design #nanovna-v2

 

Aleks would do that in the language of the forum, ie English.
When I log in and write on the Russian forum, I do not write in Hungarian.
Thanks.

--
*** ***
Re: Use NanoVNA to Evaluate Unlabeled Toroids?

 

Pete,
Thanks for that!
I had already modified the G3TXQ sheet, but yours is nice and simple.

One thing I think I shpould mention, your entry fields are: linear(S21) and phase(S21)
In the S2P files coming from my nanoVNA those numbers are not given, but Real(S21) and Imag(S21) are. So now I'm only using the bottom part of the sheet. It certainly cleans up my first modified G3TXQ thingy :-).

73

Arie PA3A


Op 18-4-2020 om 14:54 schreef WB2UAQ:

To calculate the Z of the DUT between Ch0 and Ch1 (using S21 Series method), I initially used G3TXQ's method after converting from his formats to what the Nanovna outputs. However, I found an Agilent presentation "Challenges and Solutions for Impedance Measurements" on the web. The author described several methods including an S21 Shunt and and S21 Series method of measuring a device's impedance. I used his general formulas and converted them to run in Excel. I'll try to attach the spreadsheet.
The G3TXQ method uses an AIM brand instrument that Steve had. He did a great job of reasoning-out how to calculate the series method. The Agilent presentation gave us a better form to use and after some tinkering with the trig I was able to get the formulas to agree:)
I have good results compared against an expensive 4 terminal instrument. Please let me know how it works out for you. Thanks! 73, Pete
Sorry if some one else already posted something on this.
Re: NanoVNA Testboard kit VNA Test Demo Board #applications

 

On Sat, Apr 18, 2020 at 04:21 AM, CT2FZI wrote:
...If one has that basic soldering skills you could build these for less than 4USD, specially if you just build the test fixture...
===============================
Yes,
The parts count are less than 4 usd, but the hassle of ordering the strip board, headers and sma connectors from one source make purchasing the kit attractive. The PCB is also much nicer than most of us could produce using a strip board.The SDR Kits Testboard is twice as much and also requires assembly. So if you were already considering purchasing that test board, the NanoVNA Testboard is another less expensive option. I ordered two and with the 5% discount and $2.00 new user coupon paid less than $20.00. With the COVID-19 shipping delays I don't expect to see them until late May, but I'm in no hurry.

SDR Kits has a couple of documents on their website that are a must have for anyone considering purchasing the NanoVNA Testboard kit:





Proper acknowledgement to SDR Kits for originating the design concept.

- Herb
Re: NanoVNA Testboard kit VNA Test Demo Board #applications

 

"40pin round row seat x2"

You cut them to the length required.

73

-Jim
NU0C


On Sat, 18 Apr 2020 05:33:59 -0700
"Oristo" <ormpoa@...> wrote:

Does that kit actually include the pictured 7x7 turned pin socket?
It is NOT on the packing list...
Re: Use NanoVNA to Evaluate Unlabeled Toroids?

 

To calculate the Z of the DUT between Ch0 and Ch1 (using S21 Series method), I initially used G3TXQ's method after converting from his formats to what the Nanovna outputs. However, I found an Agilent presentation "Challenges and Solutions for Impedance Measurements" on the web. The author described several methods including an S21 Shunt and and S21 Series method of measuring a device's impedance. I used his general formulas and converted them to run in Excel. I'll try to attach the spreadsheet.
The G3TXQ method uses an AIM brand instrument that Steve had. He did a great job of reasoning-out how to calculate the series method. The Agilent presentation gave us a better form to use and after some tinkering with the trig I was able to get the formulas to agree:)
I have good results compared against an expensive 4 terminal instrument. Please let me know how it works out for you. Thanks! 73, Pete
Sorry if some one else already posted something on this.

Nanovna S21 Series-Thru DUT Z.xlsx
Nanovna S21 Series-Thru DUT Z.xlsx

Re: NanoVNA Testboard kit VNA Test Demo Board #applications

 

Does that kit actually include the pictured 7x7 turned pin socket?
It is NOT on the packing list...
Re: Question about Calibration document

 

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.
Re: NanoVNA Testboard kit VNA Test Demo Board #applications

 

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 s¨¢bado, 18/04/2020, 11:43, hwalker <herbwalker2476@...> 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
Re: V2 Design #nanovna-v2

[email protected]
 

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IMG-20200418-WA0002.jpg

Re: Use NanoVNA to Evaluate Unlabeled Toroids?

 

Thanks, that looks great

How do you calculate complex choking impedance?

Cheers!



A s¨¢bado, 18/04/2020, 10:44, Aleksander Shalygin <shalygin@...>
escreveu:

My experiments.
NanoVNA Testboard kit VNA Test Demo Board #applications

 

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

NanoVNA Test Board-2.png
NanoVNA Test Board.png

Re: Use NanoVNA to Evaluate Unlabeled Toroids?

 

My experiments.

IMG_2225.JPG
IMG_2229.JPG

Re: Just Bought nanoVNA

 

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!
Re: Just Bought nanoVNA

 

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!
Re: Just Bought nanoVNA

 

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.
"

On Fri, Apr 17, 2020, 9:59 PM Ron <rkjewett@...> wrote:


Thanks, Bob!
BTW, my laptop is Windows 7
--
Ron
WA0RJ
Re: Just Bought nanoVNA

 

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

|
|
| |
NanoVNASaver | NanoVNA

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

|

|






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
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