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On Sun, Feb 9, 2025 at 10:40 AM, Roger Need wrote:

Unfortunately the link you provided was cutoff and did not work. Hopefully
groups.io formats this one correctly...

(z)-c.html

Groups.io cutoff my link as well. Here is another attempt...


Roger

On Sun, Feb 9, 2025 at 01:23 AM, DiSlord wrote:

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

Unfortunately the link you provided was cutoff and did not work. Hopefully groups.io formats this one correctly...

(z)-c.html

Copper mountain Provides for several Fixture Simulations. Here is the link to the topic.


The current Port Z function in the NanoVNA changes the reference impedance using only the real part with imaginary set to zero.. The measurement is still made using 50 ohms on Port 1 (CH0) and Port 2 (CH1) and a mathematical conversion of the matrix of S-parameters measured at 50 ohms to the matrix of S-parameters with a reference impedance entered by the user is generated. In my opinion there is a limitation to this method in that the DUT is being driven and loaded by 50 ohms and that only linear passive devices will yield correct results. Non linear devices or active circuits will not be tested with the impedance they are designed to operate with and simulation using this method will not yield correct results. So a 300 ohm resistive attenuator would measure OK but a crystal filter circuit that was not designed to work in a 50 ohm system would not.

Roger

Roger,
Resolved: You nailed the issue. I thought for sure I was an SI type but sure enough the HW version is 4.3_MS. The flash changed it to SI.

The unit will now calibrate with a stimulus of 50khz to 1.5G with no issues.

Thanks for all the help guys.

Bryan, N0LUF

On my older firmware, the menu selection is config/expert setting
settings/more/mode. The mode setting toggles between Si5351 and MS5351.
This path may be different in 1.2.40.

Tony AC9QY

On Sun, Feb 9, 2025 at 12:18?PM Tony Scaminaci via groups.io <tonyscam=
[email protected]> wrote:

The label on the back does indicate if it’s using the MS5351. Someone (and
I can’t remember whom) mentioned that firmware 1.2.40 included support for
both the Si5351 and MS5351. After flashing, there is a setting in a menu
(can’t remember this either) to select the proper chip. If I can find that
menu setting, I’ll post it.

Tony AC9QY



On Sun, Feb 9, 2025 at 11:58?AM Roger Need via groups.io <sailtamarack=
[email protected]> wrote:

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

The label on the back does indicate if it’s using the MS5351. Someone (and
I can’t remember whom) mentioned that firmware 1.2.40 included support for
both the Si5351 and MS5351. After flashing, there is a setting in a menu
(can’t remember this either) to select the proper chip. If I can find that
menu setting, I’ll post it.

Tony AC9QY



On Sun, Feb 9, 2025 at 11:58?AM Roger Need via groups.io <sailtamarack=
[email protected]> wrote:

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

Hi Gabriele,

My signal generator is the FY6800 (60 MHz). I believe the FY6900 is very
similar.

I do not use it with my nanoVNA nor my tinySA. I have checked the output
levels at 10 MHz
using an old commercial RF millivoltmeter which has a 50 ohms input
impedance.
At very low settings the poor screening of the plastic case prohibits its
use in testing
communication receivers.

73 Phil G3SES



On Sun, 9 Feb 2025 at 12:02, Gabriele I4JXE via groups.io <gbergami=
[email protected]> wrote:

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=
[email protected]> 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

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=
[email protected]> 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=
[email protected]> 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=
[email protected]> 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=
[email protected]> 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