UR5FFR

Радиолюбительские конструкции и программы
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PostPosted: 24 Mar 2019, 17:48 
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


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PostPosted: 24 Mar 2019, 18:03 
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Joined: 21 Apr 2012, 21:00
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Location: Odessa
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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
Code:
#define SI5351_CALIBRATION       25000000

In this case menu value must be zero


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PostPosted: 24 Mar 2019, 19:13 
Done!! tks


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PostPosted: 24 Mar 2019, 19:25 
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Joined: 21 Apr 2012, 21:00
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Location: Odessa
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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


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