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I buyed a nanovna H 3.6. When I try to calibrate it, after the full procedure, if I set a Smith diagram and I connect THRU the two ports using the supplied cable the value is 50 ohm instead of 0. I resetted and repeated the calibration a lot of time but with the same result. Can you help me? Thanks

Port 2 is 50Ω as it should be, why do you imagine that it would be 0?

On Tue, 1 Apr 2025 at 14:14, paolo.vecchi via groups.io <paolo.vecchi=
[email protected]> wrote:

I buyed a nanovna H 3.6. When I try to calibrate it, after the full
procedure, if I set a Smith diagram and I connect THRU the two ports using
the supplied cable the value is 50 ohm instead of 0. I resetted and
repeated the calibration a lot of time but with the same result. Can you
help me? Thanks

Per avere il valore zero sul diagramma di Smith (puntatore alla estrema
sinistra) devi mettere il connettore SHORT.


Il Mar 1 Apr 2025, 14:14 paolo.vecchi via groups.io <paolo.vecchi=
[email protected]> ha scritto:

I buyed a nanovna H 3.6. When I try to calibrate it, after the full
procedure, if I set a Smith diagram and I connect THRU the two ports using
the supplied cable the value is 50 ohm instead of 0. I resetted and
repeated the calibration a lot of time but with the same result. Can you
help me? Thanks

Hi, I have seen a video on Youtube…

NANOVNA analizzatore di antenne: come usarlo ( )
youtu.be ( )

( )
Inviato da iPhone

Grazie
Inviato da iPhone

If the video on Youtube notes that the impedance should be zero, it is
incorrect. The THRU impedance should be 50 ohms. I just checked on three
NanoVNA's, and they all measure 50 ohms.

Zack W9SZ

On Tue, Apr 1, 2025 at 8:48?AM Paolo via groups.io <paolo.vecchi=
[email protected]> wrote:

Hi, I have seen a video on Youtube…

NANOVNA analizzatore di antenne: come usarlo (
)
youtu.be ( )

( )
Inviato da iPhone

Il giorno 1 apr 2025, alle ore 15:39, Dragan Milivojevic via groups.io
<d.milivojevic@...> ha scritto:

? Port 2 is 50Ω as it should be, why do you imagine that it would be 0?

On Tue, 1 Apr 2025 at 14:14, paolo.vecchi via groups.io <paolo.vecchi=
[email protected]> wrote:

I buyed a nanovna H 3.6. When I try to calibrate it, after the full

procedure, if I set a Smith diagram and I connect THRU the two ports

using

the supplied cable the value is 50 ohm instead of 0. I resetted and

repeated the calibration a lot of time but with the same result. Can you

help me? Thanks

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

Thanks a lot

Inviato da iPad

Beware of most YouToob presentations. Those by the "big boys" which offer
their instruments for lots of $$$$ are good and solid. Many of those by
amateurs or "self proclaimed experts" are flawed. Take anything on YouToob
with a huge grain of salt!!

Dave - W?LEV

On Tue, Apr 1, 2025 at 1:59?PM Zack Widup via groups.io <w9sz.zack=
[email protected]> wrote:

If the video on Youtube notes that the impedance should be zero, it is
incorrect. The THRU impedance should be 50 ohms. I just checked on three
NanoVNA's, and they all measure 50 ohms.

Zack W9SZ

On Tue, Apr 1, 2025 at 8:48?AM Paolo via groups.io <paolo.vecchi=
[email protected]> wrote:

Hi, I have seen a video on Youtube…

NANOVNA analizzatore di antenne: come usarlo (
)
youtu.be ( )

( )
Inviato da iPhone

Il giorno 1 apr 2025, alle ore 15:39, Dragan Milivojevic via groups.io
<d.milivojevic@...> ha scritto:

? Port 2 is 50Ω as it should be, why do you imagine that it would be 0?

On Tue, 1 Apr 2025 at 14:14, paolo.vecchi via groups.io <paolo.vecchi=
[email protected]> wrote:

I buyed a nanovna H 3.6. When I try to calibrate it, after the full

procedure, if I set a Smith diagram and I connect THRU the two ports

using

the supplied cable the value is 50 ohm instead of 0. I resetted and

repeated the calibration a lot of time but with the same result. Can

you

help me? Thanks

<

Virus-free.www.avg.com
<

<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

--

*Dave - W?LEV*


--
Dave - W?LEV

Possibly the attachment will help.

Dave - W?LEV

On Tue, Apr 1, 2025 at 3:36?PM W0LEV via groups.io <davearea51a=
[email protected]> wrote:

Beware of most YouToob presentations. Those by the "big boys" which offer
their instruments for lots of $$$$ are good and solid. Many of those by
amateurs or "self proclaimed experts" are flawed. Take anything on YouToob
with a huge grain of salt!!

Dave - W?LEV

On Tue, Apr 1, 2025 at 1:59?PM Zack Widup via groups.io <w9sz.zack=
[email protected]> wrote:

If the video on Youtube notes that the impedance should be zero, it is
incorrect. The THRU impedance should be 50 ohms. I just checked on three
NanoVNA's, and they all measure 50 ohms.

Zack W9SZ

On Tue, Apr 1, 2025 at 8:48?AM Paolo via groups.io <paolo.vecchi=
[email protected]> wrote:

Hi, I have seen a video on Youtube…

NANOVNA analizzatore di antenne: come usarlo (
)
youtu.be ( )

( )
Inviato da iPhone

Il giorno 1 apr 2025, alle ore 15:39, Dragan Milivojevic via

groups.io

<d.milivojevic@...> ha scritto:

? Port 2 is 50Ω as it should be, why do you imagine that it would be

0?

On Tue, 1 Apr 2025 at 14:14, paolo.vecchi via groups.io

<paolo.vecchi=

[email protected]> wrote:

I buyed a nanovna H 3.6. When I try to calibrate it, after the full

procedure, if I set a Smith diagram and I connect THRU the two ports

using

the supplied cable the value is 50 ohm instead of 0. I resetted and

repeated the calibration a lot of time but with the same result. Can

you

help me? Thanks

<

Virus-free.www.avg.com
<

<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

--

*Dave - W?LEV*


--
Dave - W?LEV

--

*Dave - W?LEV*


--
Dave - W?LEV

Dave,

One doubt about the Smith Chart: Why does the so-called resistive component
change as you move across the tracing? If it was the true electrical
resistance due to the ohmic resistance of the wire and feedline, it should
not change.

Forgive my ignorance. I have started using NanoVNA only recently.

73
VU2JO

On Tue, Apr 1, 2025 at 9:15?PM W0LEV via groups.io <davearea51a=
[email protected]> wrote:

Possibly the attachment will help.

Dave - W?LEV

On Tue, Apr 1, 2025 at 3:36?PM W0LEV via groups.io <davearea51a=
[email protected]> wrote:

Beware of most YouToob presentations. Those by the "big boys" which

offer

their instruments for lots of $$$$ are good and solid. Many of those by
amateurs or "self proclaimed experts" are flawed. Take anything on

YouToob

with a huge grain of salt!!

Dave - W?LEV

On Tue, Apr 1, 2025 at 1:59?PM Zack Widup via groups.io <w9sz.zack=
[email protected]> wrote:

If the video on Youtube notes that the impedance should be zero, it is
incorrect. The THRU impedance should be 50 ohms. I just checked on

three

NanoVNA's, and they all measure 50 ohms.

Zack W9SZ

On Tue, Apr 1, 2025 at 8:48?AM Paolo via groups.io <paolo.vecchi=
[email protected]> wrote:

Hi, I have seen a video on Youtube…

NANOVNA analizzatore di antenne: come usarlo (
)
youtu.be ( )

( )
Inviato da iPhone

Il giorno 1 apr 2025, alle ore 15:39, Dragan Milivojevic via

groups.io

<d.milivojevic@...> ha scritto:

? Port 2 is 50Ω as it should be, why do you imagine that it would

be

0?

On Tue, 1 Apr 2025 at 14:14, paolo.vecchi via groups.io

<paolo.vecchi=

[email protected]> wrote:

I buyed a nanovna H 3.6. When I try to calibrate it, after the

full

procedure, if I set a Smith diagram and I connect THRU the two

ports

using

the supplied cable the value is 50 ohm instead of 0. I resetted

and

repeated the calibration a lot of time but with the same result.

Can

you

help me? Thanks

<

Virus-free.www.avg.com
<

<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

--

*Dave - W?LEV*


--
Dave - W?LEV

--

*Dave - W?LEV*


--
Dave - W?LEV

On Tue, Apr 1, 2025 at 11:36 AM, W0LEV wrote:

Beware of most YouToob presentations.

You can absolutely trust Alan Wolke W2AEW's videos. He is a Tektronix Field Engineer, I know him personally and knows his stuff 100%.

And, to your original question you must be looking at S11 Smith Chart display to see 50Ohms; S21 magnitude should be 0dB when the thru is connected.
Best regards, Don Brant

Even a linear wire, not coiled, has some measurable inductance. At zero
length the display on the Smith chart, will show a single value of zero at
the extreme left of the real axis. That point on the Smith Chart is
0.00.... ± j 0 ohms. That represents a short circuit. As the measurement
point along the linear wire is increased, both the RF resistance (skin
effect) and inductance increase. Therefore, the measurement will depart
upward on the chart (inductive reactance) and to the right along the
central line on the chart. Since the vast majority of RF measurements are
assumed in a 50-ohm system (the industry standard except for the television
people), the chart is laid out around that value. ONLY the central point
(see the previous attachment) represents 50 ± j0 ohms.

The extreme right position along the central axis (real only) represents an
open circuit or theoretically infinite resistance.

An excellent tool both for analysis, modeling, and learning the Smith Chart
is SimSmith. It's free and available at the following URL:



That URL also contains many good tutorials addressing the Smith Chart.

More information can be had at the following:



Dave - W?LEV



On Tue, Apr 1, 2025 at 3:52?PM Jon via groups.io <vu2jo0@...>
wrote:

Dave,

One doubt about the Smith Chart: Why does the so-called resistive component
change as you move across the tracing? If it was the true electrical
resistance due to the ohmic resistance of the wire and feedline, it should
not change.

Forgive my ignorance. I have started using NanoVNA only recently.

73
VU2JO

On Tue, Apr 1, 2025 at 9:15?PM W0LEV via groups.io <davearea51a=
[email protected]> wrote:

Possibly the attachment will help.

Dave - W?LEV

On Tue, Apr 1, 2025 at 3:36?PM W0LEV via groups.io <davearea51a=
[email protected]> wrote:

Beware of most YouToob presentations. Those by the "big boys" which

offer

their instruments for lots of $$$$ are good and solid. Many of those

by

amateurs or "self proclaimed experts" are flawed. Take anything on

YouToob

with a huge grain of salt!!

Dave - W?LEV

On Tue, Apr 1, 2025 at 1:59?PM Zack Widup via groups.io <w9sz.zack=
[email protected]> wrote:

If the video on Youtube notes that the impedance should be zero, it

is

incorrect. The THRU impedance should be 50 ohms. I just checked on

three

NanoVNA's, and they all measure 50 ohms.

Zack W9SZ

On Tue, Apr 1, 2025 at 8:48?AM Paolo via groups.io <paolo.vecchi=
[email protected]> wrote:

Hi, I have seen a video on Youtube…

NANOVNA analizzatore di antenne: come usarlo (
)
youtu.be ( )

( )
Inviato da iPhone

Il giorno 1 apr 2025, alle ore 15:39, Dragan Milivojevic via

groups.io

<d.milivojevic@...> ha scritto:

? Port 2 is 50Ω as it should be, why do you imagine that it would

be

0?

On Tue, 1 Apr 2025 at 14:14, paolo.vecchi via groups.io

<paolo.vecchi=

[email protected]> wrote:

I buyed a nanovna H 3.6. When I try to calibrate it, after the

full

procedure, if I set a Smith diagram and I connect THRU the two

ports

using

the supplied cable the value is 50 ohm instead of 0. I resetted

and

repeated the calibration a lot of time but with the same result.

Can

you

help me? Thanks

<

Virus-free.www.avg.com
<

<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

--

*Dave - W?LEV*


--
Dave - W?LEV

--

*Dave - W?LEV*


--
Dave - W?LEV

--

*Dave - W?LEV*


--
Dave - W?LEV

Yes. Alan is one of the "big boys" and belongs to Tek. Those by amateurs
and others may be highly questionable. At least those are my experiences
with YouToob. For example, addressing ferrites, Fair-Rite has a
wonderfully useful and solid site, even some directly aimed at the amateur
radio community. So do Agilent, Tek, Keysite, Advantest, R&S, HP, and
many.....many others. To properly utilize YouToob presentations, one must
first know at least the basics of the knowledge they are seeking. Without
a basic knowledge, you are highly likely to be "snake oiled" and
"witchcrafted" and "sorceried" and.......

Dave - W?LEV

On Tue, Apr 1, 2025 at 4:03?PM Donald S Brant Jr via groups.io <dsbrantjr=
[email protected]> wrote:

On Tue, Apr 1, 2025 at 11:36 AM, W0LEV wrote:

Beware of most YouToob presentations.

You can absolutely trust Alan Wolke W2AEW's videos. He is a Tektronix
Field Engineer, I know him personally and knows his stuff 100%.

And, to your original question you must be looking at S11 Smith Chart
display to see 50Ohms; S21 magnitude should be 0dB when the thru is
connected.
Best regards, Don Brant

--

*Dave - W?LEV*


--
Dave - W?LEV