03-12-2023, 09:31 AM
I have checked my signal generator with two different frequency counters and it is dead on.
R20 was changed when I was doing electronic repairs.
The oscillator looks original based on wire dress and soldering.
The oscillator section of the tuning cap has the same number of plates as the other section but the rotor plates are smaller.
If I tune this radio to 800 kHz I can hear the oscillator at 1520 kHz on another radio. Keep in mind that the Coronado's dial is not made for precise measuring.
There are no nearby stations below 920 kHz so not being able to tune the bottom end in is no loss. However, I’d like to find the cause of this problem.
Would it be worth measuring the capacitance of the tuning cap and the inductance of the oscillator coil and calculating the resonant frequency?
R20 was changed when I was doing electronic repairs.
The oscillator looks original based on wire dress and soldering.
The oscillator section of the tuning cap has the same number of plates as the other section but the rotor plates are smaller.
If I tune this radio to 800 kHz I can hear the oscillator at 1520 kHz on another radio. Keep in mind that the Coronado's dial is not made for precise measuring.
There are no nearby stations below 920 kHz so not being able to tune the bottom end in is no loss. However, I’d like to find the cause of this problem.
Would it be worth measuring the capacitance of the tuning cap and the inductance of the oscillator coil and calculating the resonant frequency?
Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.
