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Apologies for the repeat of an ongoing topic.

As a recent purchase I am banging my head against the wall attempting to update the firmware for my nanovna-h. I have no issues configuring and using it to undertake SWR for my antennas.

However, when attempting to update the DFU file, my windows 11 device manager immediately shows the device disappear and still in the DFUSE software the device does not exist.

Is anyone able to provide a step by step approach of the key drivers etc...and the order of installation that I need to go through to finally get this device updated.

Thank you, Pete

On Sun, Feb 9, 2025 at 09:13 AM, Tim Dawson wrote:

I have lost your initial message, but if this is an -H4, isnthe MS/SI option
ser correctly?

That can change when flashing.

Yes that setting is important. IF the OP bought his H4 a few years ago it is the SI version. I thought the label on the back indicated if it was an MS version It is easy enough to try both settings and see if one works better than the other.

The other issue is that some of the chips will not operate up to 300 MHz. You can change the upper limit by going into Config-Expert Settings and changing the limit under Threshold.

Roger

If your primary use will be below 1GHz, get the H4. If you expect to do
much above 1GHz, get a V2 or LiteVNA-64.

On Sun, Feb 9, 2025, 8:39 AM David J Taylor via groups.io <davidtaylor=
writeme.com@groups.io> wrote:

On 09/02/2025 14:20, CLIFTON HEAD via groups.io wrote:

For a newie using wanting to use NanoVNA which is better the NanoVNA F

V2 or the H4

You might like to include the LiteVNA 64 in your list:



Cheers,
David
--
SatSignal Software - Quality software for you
Web:
Email: davidtaylor@...
BlueSky: @gm8arv.bsky.social, Twitter: @gm8arv

Hi Tony,
I thought I had the noted somewhere but cant seem to locate it.now. I should have backed it up. I wonder if my amazon history would yield the answer.

It seems to work fine if I dont cross one of those ranges in my stimulus setting.
Bryan

I have lost your initial message, but if this is an -H4, isnthe MS/SI option ser correctly?

That can change when flashing.

--
Sent from my Android device with K-9 Mail. Please excuse my brevity.

Bryan,

What was your original firmware version? Have you tried re-flashing back to
that version? This would eliminate hardware concerns and focus solely on
firmware. I noticed there are 10 issues flagged on version 1.2.40 which
gives me pause. I also noticed that a new version number of 1.2.42 has been
assigned for a future update.

Tony AC9QY

On Sun, Feb 9, 2025 at 9:51?AM Bryan Curl via groups.io <bc3910=
gmail.com@groups.io> wrote:

COULD IT BE?

There are three ranges noted on the back label. 50k-300MHz, 300MHz-900MHz,
and 0.9GHz

-1.5GHz.

If my stimulus start and stop crisses over one of these ranges then I see
this happen.

So this may be a feature I never heard of instead of a bug or problem.

Maybe me talking to myself will help some poor bloak searching the threads
someday. lol

Bryan N0LUF

COULD IT BE?

There are three ranges noted on the back label. 50k-300MHz, 300MHz-900MHz, and 0.9GHz-1.5GHz.

If my stimulus start and stop crisses over one of these ranges then I see this happen.

So this may be a feature I never heard of instead of a bug or problem.

Maybe me talking to myself will help some poor bloak searching the threads someday. lol

Bryan N0LUF

UPDATE: It seems this only happens when my stop freq is above 300mhz. Is this normal or is my understanding flawed. I may have never noticed this because I don't recall ever using it that high.

Bryan, n0luf

On 09/02/2025 14:20, CLIFTON HEAD via groups.io wrote:

For a newie using wanting to use NanoVNA which is better the NanoVNA F V2 or the H4

You might like to include the LiteVNA 64 in your list:



Cheers,
David
--
SatSignal Software - Quality software for you
Web:
Email: davidtaylor@...
BlueSky: @gm8arv.bsky.social, Twitter: @gm8arv

On my H4, I recently started having a problem calibrating. During cal the smith chart is sweeping wildly displaying a lot of straight angled lines about the cursor. In the end the cal fails as evidence by measuring the cal standards.

This started after flashing firmware to H4 dislord 1.2.40 though I suppose it could be coincidental.

I opened it and checked for cracked solder joints but didnt see any. Then I flashed it a few more times, testing in between, and finally after 2-3 attempts it started behaving normally again.

Has anyone else seen this before? Maybe I had some setting botched?

Bryan, N0LUF

Depends on what you want. The H4 has less frequency range but I like the
larger screen. I suppose you could get one of each.

Zack W9SZ

On Sun, Feb 9, 2025, 8:20 AM CLIFTON HEAD via groups.io <aecret=
outlook.com@groups.io> wrote:

For a newie using wanting to use NanoVNA which is better the NanoVNA F V2
or the H4

For a newie using wanting to use NanoVNA which is better the NanoVNA F V2 or the H4

TNX for replies
following the First Interest Groups Law:
"At every question will always follow unwanted suggestions"
73

Il Dom 9 Feb 2025, 11:14 Bruce Akhurst via groups.io <bruce=
akhurst.net@groups.io> ha scritto:

Very hard to see what it would do better than the NanoVNA for filters etc

You don’t need the excess power and the output range is pretty limited for
harmonic filters etc

Very hard to see what it would do better than the NanoVNA for filters etc

You don’t need the excess power and the output range is pretty limited for harmonic filters etc

Here is renormalization in coppermountaintech
Analysis > Fixture Simulator > Port Z Conversion
(z)-c.html

Microwave circuit theories - need for complex impedance, for not complex Z` calculations more simple

Roger,

I believe DiSlord is indeed asking whether the ability to accurately
measure differing DUT input and output ports would be useful. It may not be
used often but there are definitely uses for testing baluns and other
asymmetrical two-port networks. I think “port renormalization” doesn’t
properly describe this type of measurement as opposed to 75/75 ohm
measurements. A different terminology would be better to describe 75/300
ohm measurements but I’m at a loss to come up with a description that makes
sense. Ideas wanted.

Tony AC9QY

On Sat, Feb 8, 2025 at 7:09?PM John Gord via groups.io <johngord=
verizon.net@groups.io> wrote:

Roger,
I am happy with the in/out impedances being the same. I just didn't want
the renormalization feature the disappear.
--John

On Sat, Feb 8, 2025 at 03:24 PM, Roger Need wrote:

On Sat, Feb 8, 2025 at 12:35 PM, John Gord wrote:

The renormalization is useful for measuring networks (like crystal or

ceramic

filters) which are designed for other impedance levels.

Do you want different impedances on input and output? I believe that

is what

DiSlord is suggesting...

Roger

Roger,
I am happy with the in/out impedances being the same. I just didn't want the renormalization feature the disappear.
--John

N. I. Yannopoulou and P. E. Zimourtopoulos, "Comparing a NanoVNA with a LabVNA Part 2: Three NanoVNAs, Two H4 NanoVNAs, and One HP 8505A VNA", FunkTechnikPlus # Journal, Issue 36, Friday 31 January 2025, Year 12, 36-3, pp 57-77:

On Sat, Feb 8, 2025 at 12:35 PM, John Gord wrote:

The renormalization is useful for measuring networks (like crystal or ceramic
filters) which are designed for other impedance levels.

Do you want different impedances on input and output? I believe that is what DiSlord is suggesting...

Roger

On Sat, Feb 8, 2025 at 09:26 AM, W0LEV wrote:

Why not just use a normalized Smith Chart? Ten the center resistance can
be anything you want.

Smith Chart is only for S11. The Port Z feature also works with S21.

Roger