Thanky you for the valuable information Yves!
I have now checked a bit further and made sure the VTO_TUNE reached the A9 Third Converter assembly ok.
My VTO_TUNE voltage varies between -0.43 (10 MHz Ref disconnected) to -13.27 Volt (10 MHz Ref connected).
?
My 300 MHz VCXO range is 299.872 MHz (10 MHz Ref disconnected) to 299.959 MHz (10 MHz Ref connected) - A total range of 88 kHz which is a bit smaller than yours 111 kHz.
This time I have meassured the frequency at the Cal Out to make the meassurement easier.
?
I have desoldered and checked the R68 potentiometer and it was fine.
Do you have any further good ideas?
Best Regards
Anders
