Frequency regulation works. Its range has to be reduced though. Now the signals jitter around the setpoint value. The course setting is just too rough. 50 MHz error is no exception. The course setting is simply 500MHz/24Volt * Voltage.I have measured frequency vs Voltage of the VCO it, it is not lineair at the low range and at the high end.
I will make a hardware linearizer. I may store correction values in EEPROM if the linearizer doesn't solve the problem entirely.
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