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On Sat, Sep 17, 2022 at 11:27 AM, John Gord wrote:

The latest DisLord firmware for the NanoVNA does allow you to see what the
filter response would be with a load impedance different than 50 ohms.

I respectfully disagree with you. The Port Z feature in the latest DiSlord software only does the mathematical calculations necessary to convert the measurements to a different system impedance (like 600 ohms instead of 50)

It does NOT change the actual load impedance on the filter itself. The filter characteristics will change if you do not use the actual source and load impedance that the filter was designed for. For example take an IF filter that was designed for a 1000 ohm in/out impedance. If you put 50 ohms on the output the rolloff characteristics will be much worse than at 1000 ohms and no mathematical calculations in the NanoVNA will compensate for that.

Roger

Gerard,
1) The DisLord firmware should work on most any NanoVNA, clone or not.
2) I don't know if the PORT-Z feature works via NanoVNASaver.
3) 3-leged filters should work with the PORT-Z method. Remember to do a SOLT calibration first.
--John Gord

Hello John,

Thank you for your response
1) First I have to see if I can download it into my nanoVNA (Compatibility) and study how to do it. See picture probably a clone
2) Then I emulate more with a laptop PC, because the view on a 2.8 screen is dificult. I use NanoVNASaver software. I don’t know if another software is needed to have direct access to this PORT-Z device.
Finally, I watched two videos on YouTube.
One tests quartz (2 legs), the other a house filter made of several quartz.
3)My question is, will it work with a 2-cup (3-legged) filter?

cdt

On Sat, Aug 27, 2022 at 10:40 AM, DiSlord wrote:

I think this hardware LCD module problem, my LCD on V2Plus4 also have
artefacts on screenshots, i replace module, and after this all ok. I can`t
solve this by software (i think use different LCD driver, and i don`t know how
init it).
This module on other device also have this problems.

Thanks for the tip. I got a new display and now the screen capture works. The old display has the version 1.0 and the new display has the version 1.1.

Gerard,
The latest DisLord firmware for the NanoVNA does allow you to see what the filter response would be with a load impedance different than 50 ohms.

First perform an SOLT (short, open, load, through) calibration right at your filter test point. Then connect the filter: You should see a somewhat distorted band-pass response at the nominal filter center frequency (use a span about 4 times the nominal filter width).

Then use the PORT-Z setting in the DISPLAY menu. Set it to something like 500 ohms and see if the filter response looks flatter in the pass band. Adjust the PORT-Z setting until you get the flattest response.

You can try adding a small capacitor (a few pF) to ground to see if it improves things.

Once you get an approximate value for the filter design impedance, you can design some simple L-match sections to measure the response more accurately. Some iteration may be required.

--John Gord

On Sat, Sep 17, 2022 at 09:59 AM, Gerard wrote:

Hello,

How to find the values of the "Terminating impedance" of a filter 2 poles.
(values of resistor and capacity)
I have 2 models, but I can’t find the values on the Net (45R15AZ; motorola
20J26)

Is it possible with a NanoVNA? or other?

cdt

On Sat, Sep 17, 2022 at 09:59 AM, Gerard wrote:

45R15AZ

Hello,

How to find the values of the "Terminating impedance" of a filter 2 poles. (values of resistor and capacity)
I have 2 models, but I can’t find the values on the Net (45R15AZ; motorola 20J26)

Is it possible with a NanoVNA? or other?

cdt

On Thu, Sep 15, 2022 at 09:47 AM, Peter wrote:

Hi Francois ...
As you told " ....I went from 0.3.8 which worked under Seven ..." ,
friend of yours, gave you a "special" version 0.3.10 which,
according to your experience, works fine under WIN-7 ... isn'it ??
If it is true, Ho to get such a "special version" of SAVER 0.3.10 ??

Download link in this message >> /g/nanovna-users/message/29523

Roger

Hi Francois ...
As you told " ....I went from 0.3.8 which worked under Seven ..." ,
friend of yours, gave you a "special" version 0.3.10 which,
according to your experience, works fine under WIN-7 ... isn'it ??
If it is true, Ho to get such a "special version" of SAVER 0.3.10 ??

Regards : Peter (I0YLI)



-----Messaggio originale-----
From: F1AMM
Sent: Thursday, September 15, 2022 5:23 PM
To: [email protected]
Subject: Re: [nanovna-users] #nanovna-saver I'm stuck

Why don't you go back to an earlier version. What does not work is to use a recent version on an old OS. I don't think it affects the drivers (what do the experts say?). Personally I went from 0.3.8 which worked under Seven to 0.3.10 which did not work under Seven. But a nice OM gave me, here, a recompilation of 0.3.10-Win7 for Seven.
--
F1AMM (Fran?ois)

-----Message d'origine-----

De la part de Barry Jackson
jeudi 15 septembre 2022 15:20

Why don't you go back to an earlier version. What does not work is to use a recent version on an old OS. I don't think it affects the drivers (what do the experts say?). Personally I went from 0.3.8 which worked under Seven to 0.3.10 which did not work under Seven. But a nice OM gave me, here, a recompilation of 0.3.10-Win7 for Seven.
--
F1AMM (Fran?ois)

The first thing I would try is to use a new USB cable. They do wear out.
And Saver, as good as it is, does not do very good error checking on
returned data from the nano - it wxpects it to be well-behaved, so if a bad
cable causes data issues, it can crash saver.

On 15/09/2022 03:13, Brent DeWitt wrote:

Tonight NanoVNA Saver started crashing a few seconds after I connect to the first gen NanoVNA I've been using for a long time. The program finds the serial port, and is stable until I connect. It says connected, then the window closes a few seconds later. This is happening with the latest 0.5.2. The Nano is working fine stand-alone. This is on a Windows 10 PC.
Any thoughts?

0.5.2 is buggy. Wait for 0.5.3



I am testing fixes daily as the developers sort out the problems.
(Linux here but I'm sure these issues also apply to Windows)

Barry
G4MKT

Brent

I just downloaded SAVER 0.5.2 and it is working fine with my Win10 (10 yr old) desktop.

I do not see a whole lot of changes compared to earlier SAVER versions in terms of measuring common antenna characteristics via the S11.

I just gave a talk on Nano VNA to a county ARES group (near Philly) and it was working fine on my setup.
I used it to show:
Reflection coefficient, Return Loss, SWR, Phase, R and X, Z, and of course Smith Chart

Everything worked well with great graphs in bold colors.

It is SO much easier (for me) to use the Nano VNA (mine is 3 yr old now) with SAVER software that to use it as a stand-alone instrument.

So perhaps there is something unique to your setup/config that is failing.

COM port issues?
Cable RFI?

De k3eui Barry

Tonight NanoVNA Saver started crashing a few seconds after I connect to the first gen NanoVNA I've been using for a long time. The program finds the serial port, and is stable until I connect. It says connected, then the window closes a few seconds later. This is happening with the latest 0.5.2. The Nano is working fine stand-alone. This is on a Windows 10 PC.
Any thoughts?

According to information I found, the MS version will have a _M after the model number. Both my NanoVNA-H and NanoVNA-H4 do not have the _M after the model number so they are SI models. There is also a software switch on the NanoVNA that is confusing, but I have found that if the MS is visible, then you have selected the MS functionality. Same with the SI, which on both on mine are visible, then the SI functionality is selected. Like I said, very confusing. Why have a software switch for different functionality, AND, have two different software versions. Totally illogical. Have one or the other, preferably software, not a switch.

Loading the wrong software AND having the wrong switch selected will cause the Smith Chart data to jump around ir selecting a Stimulus start range above 100MHz. That will be the key to having the wrong software or settings.

Good luck

Tim and Dragan,

Thanks for your inputs. I have now updated my H4 with the SI dfu file.

On Sat, Sep 10, 2022 at 01:58 PM, John N0TA wrote:

I have a NanoVNA-H4 which is several years old. The back says HW version 4.2.
The firmware lists contain either a "MS" or "SI". My 5351 says "BG008 006.
Which version of firmware should I use?

Several years old use SI version. MS version is for recent production units with MS on the back label.

Roger

I have a NanoVNA-H4 which is several years old. The back says HW version 4.2. The firmware lists contain either a "MS" or "SI". My 5351 says "BG008 006. Which version of firmware should I use?
Thanks,
- John

On Tue, Aug 30, 2022 at 10:39 AM, Leif M wrote:

I still use W7 because most of my software is there. Nano VNA software for W7
would be nice too.

Did you get the answer to your original question and get the WIN7 software I posted working?

Roger

It is practically impossible to brick these, even if you deleted the
bootloader there are programing headers on the board. It should
be explained in the community manual.

On Sat, 10 Sept 2022 at 05:45, Ramon S via groups.io <ve7rvs=
[email protected]> wrote:

Hi Roger,

Thanks for your reply.

The label of my back shell only says...HW Version 4.2, SN: SN:H$-xxx71290.
I do not see nay mention of MS or SI. bought my unit from R&L Electronics
in Sep '20. Could it be it does not contain any of these chips?
My first instinct was to try which H4 dsu file would load on it, but am
concerned I might brick this very useful instrument...