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Frequency error


 

Select target id
00 Internal Flash 64 sectors or

And press Upload


 

Then you upload file from NanoVNA programm read all flash 128kB and save to file
Then formware created, not used space not stored to file. 82kB correct file size

Yes it Ok


 

After reading the option "01", seems that you dfu file should be written into target option "00" (internal flash 64 sectors).

A 2nd point: NanoVNA v0.8.4.6 Xtail 25997748.dfu is 82 Ko but the uploaded file from my NanoVNA is 129 Ko , is this ok ?

Rudi

Le 23.05.2020 ¨¤ 10:43, DiSlord a ¨¦crit?:
Try this firmware, just quick build vs XTALFREQ 25997748


 

Hi DiSlord,

I installed DfuSe, connected to the NanoVNA after "Reset and enter DFU" activated;

on the DfuSe screen i have 2 Targets options:

-1- 00 Internal Flash 64 sectors or

-2- 01 Option Bytes??? 1 sector.

What is the correct target ?

Thank you for your help.

Rudi

Le 23.05.2020 ¨¤ 10:43, DiSlord a ¨¦crit?:
Try this firmware, just quick build vs XTALFREQ 25997748


 

Thank you very much DiSlord for your help and work.

I will install this file this afternoon and inform you for the result.

Regards,

Rudi

Le 23.05.2020 ¨¤ 10:43, DiSlord a ¨¦crit?:
Try this firmware, just quick build vs XTALFREQ 25997748


 

30Hz in 100MHz.

That is just 0.00003% low in frequency.

For the money we spent, why would anybody not be satisfied with that?

I'm still happy with the accuracy of my Grid Dip Meter.

73, Alek, VK6APK.

On 23/05/2020 6:13 pm, Aleksander Shalygin wrote:
100 mHz, 299 mHz.


 

This is a different device.


 

100 mHz, 299 mHz.


 

Try this firmware, just quick build vs XTALFREQ 25997748


 

Hello,

For the moment, my friend has no access to the labo for component replacement (virus).

I would try your XTALFREQU modification but i'm not able to modify and recompile your software.

How can i proceed, may be with an other FW including the OFFSET command not active

on my NanoVNA-H ?

Thank you for helping me.

Regards,

Rudi

Le 21.05.2020 ¨¤ 19:41, DiSlord a ¨¦crit?:
No it look like hardware problem (or measure frequency problem)

It possible fix by software need redefine
// XTAL frequency on si5351
#define XTALFREQ 26000000U
To current XTAL frequency and rebuild

Or replace XTAL


 

I don't understand this TXCO error concern. Is the NanoVNA being used as a precision freq counter?

If you are using it for measurements between 2 freqs, what is the % of precision you are expecting from an instrument that costs less than $100.00 USD? Most test equipment is ¡À3%. I believe these are well within that.

?___
Sent from my two way wrist watch
73 de W3AB/GEO?

On May 22, 2020, 10:27, at 10:27, Rudolf Schaffer <rudolf.schaffer@...> wrote:
Hi Mike,

I agree totally ! It would be very useful in my case, waiting to
replace
the TCXO.

For the moment, i'm obliged to multiply the desired frequency by
1.0000855 to compensate

the too large error of the TCXO.

73 QRO,

Rudi, HB9ARI

Le 22.05.2020 ¨¤ 17:38, vbifyz a ¨¦crit?:
It would be nice to have a menu option to calibrate the frequency. It
is easy to adjust the Si5351A output frequency, all libraries for it
include this function.

73, Mike AF7KR



 

Hi Mike,

I agree totally ! It would be very useful in my case, waiting to replace the TCXO.

For the moment, i'm obliged to multiply the desired frequency by 1.0000855 to compensate

the too large error of the TCXO.

73 QRO,

Rudi, HB9ARI

Le 22.05.2020 ¨¤ 17:38, vbifyz a ¨¦crit?:
It would be nice to have a menu option to calibrate the frequency. It is easy to adjust the Si5351A output frequency, all libraries for it include this function.

73, Mike AF7KR


 

It would be nice to have a menu option to calibrate the frequency. It is easy to adjust the Si5351A output frequency, all libraries for it include this function.

73, Mike AF7KR


 

Thank you for your message.

I'm sure of my correct measurements:

-1- The relatives frequencies errors are ~ equal on the CW output at 100MHz

and direct TCXO (^-86 ppm)

-2- The reference of my frequency meter is furnished with the output of a well locked G3RUH GPSDO.

As written before, i will choose your 2nd solution, replacing the TCXO with a new and verified one.

Regards,

Rudi

Le 21.05.2020 ¨¤ 19:41, DiSlord a ¨¦crit?:
No it look like hardware problem (or measure frequency problem)

It possible fix by software need redefine
// XTAL frequency on si5351
#define XTALFREQ 26000000U
To current XTAL frequency and rebuild

Or replace XTAL


 

Roger,

The HW version is 3.4

and FW version: 0.4.5-1-gfbbceca.

As i wrote before:

"

With a loop, i was able to measure the TCXO frequency and found

25.997748 MHz instead of 26MHz ! This error correspond to ~ -86ppm,

not too far of the output error of -85.5 ppm at 100MHz CW !

"

According to the schematic, (may be not the corresponding one...) the oscillator is a TCXO;? i don't

see a connection to a DAC or DC source, as for a TVCXO or VCXO. A pin, labelled AFC, seems to be grounded,

as i saw on the schematic. I searched on the WEB for a component

corresponding to the hard to read reference written on the component but i found nothing.

I'm far to be a specialist, but for me, the TCXO is far away from tolerance and defect.

I'm sure it should be compensated by software, but i don't like this solution in my case with a -85.5 ppm error.

As i wrote before, i will find a compatible component (frequency, tolerances, foot-print,etc) and ask to

a friend of me to replace it.

Regards,

Rudi

Le 21.05.2020 ¨¤ 19:14, Roger Need via groups.io a ¨¦crit?:
On Thu, May 21, 2020 at 09:06 AM, Rudolf Schaffer wrote:

As the TCXO frequency is out of tolerances, it's certainly a defect
component.
DiSlord suggested the error could be due to the firmware. What version are you running?

Roger


 

No it look like hardware problem (or measure frequency problem)

It possible fix by software need redefine
// XTAL frequency on si5351
#define XTALFREQ 26000000U
To current XTAL frequency and rebuild

Or replace XTAL


 

On Thu, May 21, 2020 at 09:06 AM, Rudolf Schaffer wrote:


As the TCXO frequency is out of tolerances, it's certainly a defect
component.
DiSlord suggested the error could be due to the firmware. What version are you running?

Roger


 

As the TCXO frequency is out of tolerances, it's certainly a defect component.

As i wrote, i ordered the Nanovna-H at "Wish". I've read, but too late, that this was not the best solution...

The solution, for me, is to ask to a known friend, well equipped and trained for small SMD components replacement

to do the work. Now, i must find an equivalent or compatible component.

Rudi

Le 21.05.2020 ¨¤ 17:41, hugen@... a ¨¦crit?:
The NanoVNA-H we produced should not have such a large deviation. Can we provide PCB pictures and test pictures? If it is the version we made, we can provide a new one for free.


 

Try update firmware to my last version and check
/g/nanovna-users/files/Dislord%27s%20Nanovna%20-H%20Firmware

As i remember old Hugen (and edy555 < 0.6) firmware not fully correct select settings for SI5351

But for freq > 300 MHz error bigger * harmonic range


 

The NanoVNA-H we produced should not have such a large deviation. Can we provide PCB pictures and test pictures? If it is the version we made, we can provide a new one for free.