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Thanks for the shout out, and glad that I could help!

- Tim

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

On Sun, Feb 9, 2025 at 02:04 PM, John Gord wrote:

A crystal (or ceramic) filter response is correctly transformed by the
renormalization; I have used this feature several times.

Interesting... What was the design impedance of the filter?

I am surprised at your results because the loading greatly affects the crystal filter characteristics. The usual way is to use a series resistance, L pad or transformer on input and output if the crystal filter is designed for a higher impedance and then recalculate the response from the measured results factoring this in. Doing this is not the same as directly connecting a 50 ohms VNA and then doing a S parameter transformation (Port Z function) like the one in the NanoVNA. I am interested in your results so please explain the test setup and your results.

Roger

Roger,
Most filters are passive and linear.
A crystal (or ceramic) filter response is correctly transformed by the renormalization; I have used this feature several times.
I agree that an active circuit might not be stable if presented with 50 ohm loading when designed for another impedance.
The basic idea is that a passive two-port can be fully represented in a number of different ways like Z-parameters, Y-parameters, H-parameters and S-parameters normalized to various impedances. There are formulas to convert from one parameter type to another.

--John Gord

On Sun, Feb 9, 2025 at 11:45 AM, Tony Scaminaci wrote:

Both the link DiSlord provided and your original link work fine for me. It
may be your email provider chopping up the link.

Thanks -- I don't get the emails from this group. I just log into the Web site for groups.io. It may be the way it formats on the Web.

Roger

Hi Stan,

Shortsightedness on my part and I hadn't looked well enough and found your instructions which worked perfectly, thank you ever so much, Pete

Roger,

Both the link DiSlord provided and your original link work fine for me. It
may be your email provider chopping up the link.

Tony

On Sun, Feb 9, 2025 at 12:45?PM Roger Need via groups.io <sailtamarack=
[email protected]> wrote:

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 10:34 AM, Bryan Curl wrote:

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.

Bryan - The first one to suggest this was Tim Dawson so he gets the credit not me...

Roger

Just a crazy thought from someone with very little VNA experience .....
SMA connectors are known to have a quite limited number of insertion cycles.
Is it possible you have a connector that is no longer working reliably;y?

Pete, you are having a driver problem. Windows11 has the most recent driver from ST, so it thinks it is the best one to use, and doesn't try to install the older driver that works with DfuseDemo and nanovna-app. (This driver does work with the latest STMCubeProgrammer from st.com.)

Please see the detailed steps I provided for getting the correct driver installed in the .pdf file at the following link. This is in the files section of this group. Let me know if it doesn't clearly explain the solution, and I'll update it:
/g/nanovna-users/files/Miscellaneous/DFU-mode%20Driver%20for%20Win10Win11

Stan KC7XE

For the HR'ers in the group, the H4 seems most popular. But get the LARGE
SCREEN choice of any of them.

Dave - W?LEV

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

On Sun, Feb 9, 2025 at 2:20?PM 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

--

*Dave - W?LEV*


--
Dave - W?LEV

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