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I've only just found and joined this group and am using a donated VNA
for the first time. So I apologise if I am repeating a topic that is hidden
deep within the history of this group.

In the CAL menu there is a Correction option but I cannot find
any mention or explanation of it despite Google being my friend,
and it is not covered in G4WNC's book, "NanoVNAs Explained".

What is the purpose of the CAL Correction option and what effect
does it have on the VNA?

TIA ES 73 DE G4SDW Gareth

Basically it toggles your calibration off and uses the base cal in the unit.

/g/nanovna-users/topic/53015012?20,2,0,0

OK, thanks for that reference, but how do I know whether or not
the correction is being applied? Is there a status flag?

ie, after doing a calibration, do I leave the Correction option alone
or press it once?

A friend who has a newer VNA says that he doesn't have a Correction
option in his CAL menu

Gareth,
This option is simply a switch that turns the calibration on and off. When it is checked, it is on.
But the main status is at the left side of the display, along the center-left edge. If there is a capital 'C' there in white, the calibration is on, and the number after the calibration indicates which memory slot it was read from. If there is a '*' instead of a number after the C, it means you either haven't stored the calibration or you loaded it from the SD card.

It will probably help you to read the "Absolute Beginners Guide to the NanoVNA" (available in the files section of this group), and to watch some nanovna 'getting started' videos on youtube - there are tons of them. The ones by W2AEW are particularly good.

Note that many of the videos were done a couple of years ago with an earlier version of firmware, which didn't have as many features. So the items in the menu system may look a bit different - but everything is still there.

Stan

Oh, and the 'correction' option in the menu is in -newer- nanovna firmware, so if your friends doesn't have it, he doesn't have the latest firmware.

So yes, this was a valid question to ask, since the correction option is quite recent, and is not in the older documents or videos.

Stan, thank-you for your input. As it happens, from the timing of your post I
was actually at the same time watching the W2AEW youtube video on calibration where he
demonstrated the Correction switch in passing, so I have an answer.

I shall go back to my friend and inform him of the need to update his firmware
in respect of the missing Correction option.

73 DE G4SDW Gareth

After completing a cal, it's always a good practice to go back and verify
that your OSL actually displays as an OSL.

Dave - W?LEV

On Tue, Mar 4, 2025 at 12:02?AM Gareth Evans via groups.io <headstone255=
[email protected]> wrote:

Stan, thank-you for your input. As it happens, from the timing of your
post I
was actually at the same time watching the W2AEW youtube video on
calibration where he
demonstrated the Correction switch in passing, so I have an answer.

I shall go back to my friend and inform him of the need to update his
firmware
in respect of the missing Correction option.

73 DE G4SDW Gareth

On Mon, Mar 3, 2025 at 11:43 PM, Stan Dye wrote:

Oh, and the 'correction' option in the menu is in -newer- nanovna

firmware, so

if your friends doesn't have it, he doesn't have the latest firmware.
So yes, this was a valid question to ask, since the correction option is

quite

recent, and is not in the older documents or videos.

--

*Dave - W?LEV*


--
Dave - W?LEV

Inadvertently I had done just that, because in using the VNA for the
first time for real, tuning the ATU for 40m on the G5RV antenna,
I was getting unbelievably perfect results because the MFJ969 ATU
was switched to its internal dummy load!!!!!!!!!!

Thanks to everyone who has assisted me, 74 years young and
licensed for 55 years but there are still a lot of new fangled things
around to trip one up :-)

I always do this. Never had any problem, but at least I checked to make
sure.

Zack W9SZ

On Tue, Mar 4, 2025 at 10:50?AM W0LEV via groups.io <davearea51a=
[email protected]> wrote:

After completing a cal, it's always a good practice to go back and verify
that your OSL actually displays as an OSL.

Dave - W?LEV

On Tue, Mar 4, 2025 at 12:02?AM Gareth Evans via groups.io <headstone255=
[email protected]> wrote:

Stan, thank-you for your input. As it happens, from the timing of your
post I
was actually at the same time watching the W2AEW youtube video on
calibration where he
demonstrated the Correction switch in passing, so I have an answer.

I shall go back to my friend and inform him of the need to update his
firmware
in respect of the missing Correction option.

73 DE G4SDW Gareth

On Mon, Mar 3, 2025 at 11:43 PM, Stan Dye wrote:

Oh, and the 'correction' option in the menu is in -newer- nanovna

firmware, so

if your friends doesn't have it, he doesn't have the latest firmware.
So yes, this was a valid question to ask, since the correction option

is

quite

recent, and is not in the older documents or videos.

--

*Dave - W?LEV*


--
Dave - W?LEV

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

Can someone please tell me the latest FW version and where to download it?
Thank you in advance
Clyde KC7BJE

On Tue, Mar 4, 2025 at 01:34 PM, Clyde Lambert wrote:

Can someone please tell me the latest FW version and where to download it?
Thank you in advance

Which device - there are quite a few?

Please excuse my 80yr old brain, I know to include the rest of the info. but didn't type it.
I have a NanoVNA H4 with FW version 1.2.40.
My question is;
Is 1.2.40 the latest FW or is there a newer version?
The reason for my question is the "Calibration correction" does not show on the menu selections on my version of FW.
Thank you in advance.
Clyde KC7BJE

Once you complete your chosen cal., go back and check that the OSL actually
shows as an OSL should. If so, that will assure your cal has taken hold.

Dave - W?LEV

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

On Wed, Mar 5, 2025 at 8:05?PM Clyde Lambert via groups.io <clyde.lambert=
[email protected]> wrote:

Please excuse my 80yr old brain, I know to include the rest of the info.
but didn't type it.
I have a NanoVNA H4 with FW version 1.2.40.
My question is;
Is 1.2.40 the latest FW or is there a newer version?
The reason for my question is the "Calibration correction" does not show
on the menu selections on my version of FW.
Thank you in advance.
Clyde KC7BJE

--

*Dave - W?LEV*


--
Dave - W?LEV

What does OSL stand for and where or how to find it on the VNA H4 or F V2
________________________________
From: [email protected] <[email protected]> on behalf of W0LEV via groups.io <davearea51a@...>
Sent: Wednesday, March 5, 2025 2:49 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Apologies if flogging a dead horse! CAL Correction?

Once you complete your chosen cal., go back and check that the OSL actually
shows as an OSL should. If so, that will assure your cal has taken hold.

Dave - W?LEV

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

On Wed, Mar 5, 2025 at 8:05?PM Clyde Lambert via groups.io <clyde.lambert=
[email protected]> wrote:

Please excuse my 80yr old brain, I know to include the rest of the info.
but didn't type it.
I have a NanoVNA H4 with FW version 1.2.40.
My question is;
Is 1.2.40 the latest FW or is there a newer version?
The reason for my question is the "Calibration correction" does not show
on the menu selections on my version of FW.
Thank you in advance.
Clyde KC7BJE

--

*Dave - W?LEV*


--
Dave - W?LEV

O = Open termination
S = Short circuit termination
L = Non-reactive 50-ohm load termination

All applied to the source port.

You may also see "T" in an OSLT designation.

T = Through with the supplied coaxial cable between the source and sink
ports.

Dave - W?LEV

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

On Wed, Mar 5, 2025 at 9:48?PM CLIFTON HEAD via groups.io <aecret=
[email protected]> wrote:

What does OSL stand for and where or how to find it on the VNA H4 or F V2
________________________________
From: [email protected] <[email protected]> on behalf of
W0LEV via groups.io <davearea51a@...>
Sent: Wednesday, March 5, 2025 2:49 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Apologies if flogging a dead horse! CAL
Correction?

Once you complete your chosen cal., go back and check that the OSL actually
shows as an OSL should. If so, that will assure your cal has taken hold.

Dave - W?LEV

<

Virus-free.www.avg.com
<

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

On Wed, Mar 5, 2025 at 8:05?PM Clyde Lambert via groups.io <clyde.lambert=
[email protected]> wrote:

Please excuse my 80yr old brain, I know to include the rest of the info.
but didn't type it.
I have a NanoVNA H4 with FW version 1.2.40.
My question is;
Is 1.2.40 the latest FW or is there a newer version?
The reason for my question is the "Calibration correction" does not show
on the menu selections on my version of FW.
Thank you in advance.
Clyde KC7BJE

--

*Dave - W?LEV*


--
Dave - W?LEV

--

*Dave - W?LEV*


--
Dave - W?LEV

Clifton, the 1.2.40 firmware version is very recent, so you don't need to update. The correction item should be there in the calibration menu, but you don't need to worry about it unless for some reason you want to disable calibration. It defaults to the enabled state. Look at the very left-hand side of the screen, and if you see a capital 'C' there, at the top of a column of other letters, your calibration is enabled.

OSL - Open, Short and Load, the normal calibration of the system for a DUT
(Device Under Test)

On Wed, Mar 5, 2025 at 2:48?PM CLIFTON HEAD via groups.io <aecret=
[email protected]> wrote:

What does OSL stand for and where or how to find it on the VNA H4 or F V2
________________________________
From: [email protected] <[email protected]> on behalf of
W0LEV via groups.io <davearea51a@...>
Sent: Wednesday, March 5, 2025 2:49 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Apologies if flogging a dead horse! CAL
Correction?

Once you complete your chosen cal., go back and check that the OSL actually
shows as an OSL should. If so, that will assure your cal has taken hold.

Dave - W?LEV

<

Virus-free.www.avg.com
<

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

On Wed, Mar 5, 2025 at 8:05?PM Clyde Lambert via groups.io <clyde.lambert=
[email protected]> wrote:

Please excuse my 80yr old brain, I know to include the rest of the info.
but didn't type it.
I have a NanoVNA H4 with FW version 1.2.40.
My question is;
Is 1.2.40 the latest FW or is there a newer version?
The reason for my question is the "Calibration correction" does not show
on the menu selections on my version of FW.
Thank you in advance.
Clyde KC7BJE

--

*Dave - W?LEV*


--
Dave - W?LEV

--
Tate

After all, all devices have their dangers. The discovery of speech
introduced communication – and lies.
- Isaac Asimov

Thank You
________________________________
From: [email protected] <[email protected]> on behalf of W0LEV via groups.io <davearea51a@...>
Sent: Wednesday, March 5, 2025 4:08 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Apologies if flogging a dead horse! CAL Correction?

O = Open termination
S = Short circuit termination
L = Non-reactive 50-ohm load termination

All applied to the source port.

You may also see "T" in an OSLT designation.

T = Through with the supplied coaxial cable between the source and sink
ports.

Dave - W?LEV

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

On Wed, Mar 5, 2025 at 9:48?PM CLIFTON HEAD via groups.io <aecret=
[email protected]> wrote:

What does OSL stand for and where or how to find it on the VNA H4 or F V2
________________________________
From: [email protected] <[email protected]> on behalf of
W0LEV via groups.io <davearea51a@...>
Sent: Wednesday, March 5, 2025 2:49 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Apologies if flogging a dead horse! CAL
Correction?

Once you complete your chosen cal., go back and check that the OSL actually
shows as an OSL should. If so, that will assure your cal has taken hold.

Dave - W?LEV

<

Virus-free.www.avg.com
<

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

On Wed, Mar 5, 2025 at 8:05?PM Clyde Lambert via groups.io <clyde.lambert=
[email protected]> wrote:

Please excuse my 80yr old brain, I know to include the rest of the info.
but didn't type it.
I have a NanoVNA H4 with FW version 1.2.40.
My question is;
Is 1.2.40 the latest FW or is there a newer version?
The reason for my question is the "Calibration correction" does not show
on the menu selections on my version of FW.
Thank you in advance.
Clyde KC7BJE

--

*Dave - W?LEV*


--
Dave - W?LEV

--

*Dave - W?LEV*


--
Dave - W?LEV

Thank you Stan
________________________________
From: [email protected] <[email protected]> on behalf of Stan Dye via groups.io <standye@...>
Sent: Wednesday, March 5, 2025 5:18 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Apologies if flogging a dead horse! CAL Correction?

Clifton, the 1.2.40 firmware version is very recent, so you don't need to update. The correction item should be there in the calibration menu, but you don't need to worry about it unless for some reason you want to disable calibration. It defaults to the enabled state. Look at the very left-hand side of the screen, and if you see a capital 'C' there, at the top of a column of other letters, your calibration is enabled.

It's your calibration!

O - Open; S - Short; L - Load (The 50 Ohm)