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
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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
