开云体育

I will offer a single bit of advice: Buy *only* from approved
distributors!!!

The clones do not have the same hardware and, therefore, do not perform as
well. Further, they don't take the advertised FW updates. Buyer beware!

In the US, I buy from randl.com.

Here is a treatment of most of your questions:



Dave - W?LEV

On Sun, Jun 1, 2025 at 8:38?PM Werner via groups.io <whxde=
[email protected]> wrote:

Hello, I am interested in buying a nanoVNA-F V2 or liteVNA.

I like the -F V2 aluminium case, the display resolution and the easy
firmware update process. I dont like only 101 measuring points.
I like the liteVNAs 1001 measuring points and speed, but the plastic case
and display resolution is.. well.. not so nice.

Related to the -F V2:
I know, the V3 is available, has 801 points, but I dont need 6 GHz and
signals and dynamic are less clean compared to the V2 (as I heard).
Aside, there are serveral brands, looking all the same, for example
Sysjoint, Seesii, Chelegance and other nonames.
Do they have all the same hardware? If yes, is the firmware compatible
between them?
I read that the Sysjoint hast 301 measurement point with firmware 0.5.x.
Is this the same with the other brands, like Seesii for example?
Its not easy to know, what you get in the bay when ordering one.

Related to the liteVNA:
The tech data seems more advances to me. Is the hardware design up to date?

Related to both:
If I do a measurement outside of house, save it, and want to see results
on my computer... (nanoNVA saver)
Is the saved data really data of the measurement or is it a photo only?

Sorry for this newbee questions, maybe someone can bring a bit a light
into the dark.
Many thanks!

--

*Dave - W?LEV*


--
Dave - W?LEV

Hello, I am interested in buying a nanoVNA-F V2 or liteVNA.

I like the -F V2 aluminium case, the display resolution and the easy firmware update process. I dont like only 101 measuring points.
I like the liteVNAs 1001 measuring points and speed, but the plastic case and display resolution is.. well.. not so nice.

Related to the -F V2:
I know, the V3 is available, has 801 points, but I dont need 6 GHz and signals and dynamic are less clean compared to the V2 (as I heard).
Aside, there are serveral brands, looking all the same, for example Sysjoint, Seesii, Chelegance and other nonames.
Do they have all the same hardware? If yes, is the firmware compatible between them?
I read that the Sysjoint hast 301 measurement point with firmware 0.5.x.
Is this the same with the other brands, like Seesii for example?
Its not easy to know, what you get in the bay when ordering one.

Related to the liteVNA:
The tech data seems more advances to me. Is the hardware design up to date?

Related to both:
If I do a measurement outside of house, save it, and want to see results on my computer... (nanoNVA saver)
Is the saved data really data of the measurement or is it a photo only?

Sorry for this newbee questions, maybe someone can bring a bit a light into the dark.
Many thanks!

In your calibration routine, open, short, Load did you also calibrate the through Port A to port B as this can contribute s significant amount of errant readings. Dave

Yes. As well as the echo of the VNAs signal back comes wide band noise /power from everything electronic locally

(Sometimes enough to fry the VNA receiver )

If it measures a dummy load ok the VNA is not the issue

That is, you need a balun. There has been a lot of talk about baluns here and at other forums.
These stop or attenuate RF in the shack and make VNAs work
I have used Digikey. Mouser and others are good too, ofcourse. These are what Digikey has. The idea is to get a high impedance between antenna and feedline.

Take highest impedance at your frequency and what has large enough diameter for your cable.

Use a small common mode choke at the antenna to decouple your body parts
from the measurements.

*Clyde K. Spencer*



On Tue, May 27, 2025 at 4:30?PM Jim K4JDH via groups.io <k4jdh=
[email protected]> wrote:

I could but that would require a coax jumper of sufficient length to avoid
de-tuning by my body. As is, the jumper goes from the radio to the attic,
maybe 30 feet in length. After adjustments are made I simply step away 10
feet and look at my phone.

As I said, my main concern was overall system SWR so as not to cook my
radio. If the antenna performs, I am good with it. So far it seems to do
OK. Also, this is Alabama in May. The less time spent in a hot attic the
better. Thanks.

I could but that would require a coax jumper of sufficient length to avoid de-tuning by my body. As is, the jumper goes from the radio to the attic, maybe 30 feet in length. After adjustments are made I simply step away 10 feet and look at my phone.

As I said, my main concern was overall system SWR so as not to cook my radio. If the antenna performs, I am good with it. So far it seems to do OK. Also, this is Alabama in May. The less time spent in a hot attic the better. Thanks.

You should not need a THRU or ISOLATION calibration for a pure S11 measurement though it doesn't hurt. Many beginners forget to tap DONE when they are finished with their SOL calibration...

you try everything and nothing works.

This is why being able to have an onsite nanoVNA measure at the antenna may be the only definitive answer.
The nanoVNA does not lie BUT you must ensure ALL the Calibrations are spot on.

I had a case recently where the trace was jumping all around and no matter what I did I could not get a proper reading.
Until I remembered, the THRU path was not calibrated. there are cases when the other port is seeing something, and ensuring the thru (port to port) is calibrated the device will only tell you what it is seeing and if you have NOT calibrated out ALL the extraneous anomalies your measurement will be compromised.

Why not tune right at the antenna in the attic using the NanoVNA?

Well I have a varied Career in Broadcasting from floor Technician to RF Engineer in Transmitters, AM, FM and TV 5 Watt relays to 50 KW base stations.
Then I went on to Telus a Telcom was involved it cellular Antennas and RF Systems.professionally the VNA was indispensable. Now in Amateur radio it is an affordable tool giving incredible results.
I may have to invest in a Tiny SA next. Chip technology has made so many thing almost common place.
Enjoy your retirement I know I am. 73 Dave VE6LX

Jim, others may have done this but I haven’t seen their posts. What a great idea!

KI4QCK

Surely I am not the first to do this but I want to crow anyhow.

I have just setup a 6M Yagi in my attic. I am mostly concerned with overall system SWR. I put the VNA at the shack end along with a webcam. What a joy this was to tune. When I did this a few years ago I traveled the stairs way too many times. I also have an 80-10 EFHW that may benefit from this in the fall.

Thank you Dave for your experimentation with this little VNA wonderbox. I am discovering what it can do. So far it has enabled me to avoid frustrations with some uhf antennas I am playing with. Retirement is indeed busier than when I was employed in the Bell System.

--
73 de W8NSI Jim
New NanoVNA User, please be patient.
I build my own antennas and need this.

When Tyranny becomes Law, Revolution becomes Duty!

On Wednesday 21 May 2025 05:09:45 pm alan victor via groups.io wrote:

From Microwave Journal May 2025. An very nice article addressing RF Microwave Design and Measurments
at the University of Bristol. A series of You Tube Videos located on the reference page, at the
end of the paper, are well worth the time to highlight (copy) and watch including building a homemade
cal kit, copper tape microstrip and more.

The PAPER:



A YOU TUBE VIDEO on cal kits and their construction and more...

youtube.com/watch?v=Ws1mIK-JIrg

That video led me to another one which finally landed me on this one:



That guy does some pretty interesting stuff...

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

But in retirement the work IS play!

My 8753C weighs nearly 100 lbs.! No way is it going to accompany me
outside to make measurements of antennas. The NANOVNA certainly can and
does go outside to make measurements. Further, the 8753C can not make
direct measurements of my long doublet fed with open wire line as it is
connected to the power grid and house wiring. The NANOVNA is small enough
to make those measurements in the shack with nothing between it and the
NANO.

I just hope and pray that it will continue to be available to amateurs,
professionals, and the schools in the future. It's indispensable for
anything associated with RF!

Dave - W?LEV

<>
Virus-free.www.avg.com
<>
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

On Wed, May 21, 2025 at 5:11?PM VE6LX via groups.io <dclarke2=
[email protected]> wrote:

I see another person who asks themselves where did I ever find time to
work. Retirement while every day "may" seem like Saturday there are days
when it feels more like the first day after after a long weekend and the
work is piled so high you can not see any daylight.
"The Golden Years, more like "Fools Gold" at times. "More Work and No Pay."

--

*Dave - W?LEV*


--
Dave - W?LEV

You are welcome.

Since R&S was a partner in this education process, there are additional videos on more basic vna topics.

Thanks a lot Alan for sharing this article. Skimmed through it and
bookmarked for detailed reading.

73
Jon, VU2JO

On Thu, May 22, 2025 at 2:39?AM alan victor via groups.io <avictor73=
[email protected]> wrote:

From Microwave Journal May 2025. An very nice article addressing RF
Microwave Design and Measurments
at the University of Bristol. A series of You Tube Videos located on the
reference page, at the
end of the paper, are well worth the time to highlight (copy) and watch
including building a homemade
cal kit, copper tape microstrip and more.

The PAPER:




A YOU TUBE VIDEO on cal kits and their construction and more...

youtube.com/watch?v=Ws1mIK-JIrg

Same thing happens at the countryside

From Microwave Journal May 2025. An very nice article addressing RF Microwave Design and Measurments
at the University of Bristol. A series of You Tube Videos located on the reference page, at the
end of the paper, are well worth the time to highlight (copy) and watch including building a homemade
cal kit, copper tape microstrip and more.

The PAPER:



A YOU TUBE VIDEO on cal kits and their construction and more...

youtube.com/watch?v=Ws1mIK-JIrg