Andrey can you help me in calibrating the Si 5351 in the nano-vfo
because the code in Russian does not understand the procedure .. I would really appreciate it if you would explain
calibrating the Si 5351 in the nano-vfo
Re: calibrating the Si 5351 in the nano-vfo
1. Enter to menu
2. Select menu item 99
3. Connect frequency meter to Si5351 and measure output freq. Its will be like 25003471 or 27002452 depended on used xtal
4. Use encoder for change menu item value to last 4 digits of measured freq
5. Exit with save
or you can measure real xtal freq (as described in [3]) and change next define in config_hw.h
In this case menu value must be zero
2. Select menu item 99
3. Connect frequency meter to Si5351 and measure output freq. Its will be like 25003471 or 27002452 depended on used xtal
4. Use encoder for change menu item value to last 4 digits of measured freq
5. Exit with save
or you can measure real xtal freq (as described in [3]) and change next define in config_hw.h
Code: Select all
#define SI5351_CALIBRATION 25000000Re: calibrating the Si 5351 in the nano-vfo
Another hint for NanoVFO. Sometime if buttons have oxidized contacts keypad isn't correct working. Solution is simple - increase all resistor values in keypad divider in 5-10 times