[jzeferino]

Hi, Terry.

This happens while trying the AM alignment. I'm using a 600Hz sine wave to modulate a 455kHz carrier at 30%. The input goes in the tuning capacitor stator, and the scope is connected to the speaker leads.

I was expecting to get the same 600Hz sine wave at the speaker terminals. The sine wave is there, but at 1200Hz. The pitch sounds much higher.

Same result with a dummy load replacing the speaker.

Trying the same method on other radios produces the expected results, so it shouldn't be related to the signal generator or scope.

Thanks
JZ