Zenith 8S563 acting strange

[Olorin67]

1410, minus 960, is very close to the IF frequency (usually around 455khz) i think you were picking that up. 2 signals can mix, and you get sum and difference frequencies, that's how superheterodyne radios work, the oscillator is 455 khz above the frequency you are trying to receive, then the IF amplifier amplifies the resultant 455 khz component.