Re: memory manager/alignment


    One more piece is to identify the exact frequency of the 25 MHz (or 27 MHz) crystal used to feed the SI5351.  This requires programming a Nano with the calibration sketch, letting the Raduino get up to operating temperature, and then measuring the output from the Raduino with a signal counter.  The actual frequency is entered into the Raduino software and it's recompiled and burned into the Nano that will run the Raduino.
The actual crystal frequency is entered into the Raduino code.  This example is from the CEC firmware, V1.2.  It's from ubitx_si5351.ino line 55:

// If using 27mhz crystal, set XTAL=27000000, MSA=33.  Then vco=891mhz
#define SI5351BX_XTAL 25000000          // Crystal freq in Hz
#define SI5351BX_MSA  35                // VCOA is at 25mhz*35 = 875mhz

   There may be other ways to do it, but this is the method I've used.

On Fri, Oct 16, 2020 at 11:38 AM, Mitchel Rought wrote:
is it possible to change the display frequency through memory manager, after alignment this radio is slightly off, web sdr 7.050.000, this radio 7.049.700, I realize it's not much but still bothers me

Join to automatically receive all group messages.