Think of it like a piano. The 76 kHz is like the low A, and when you double a frequency it equals the next octave. So 152 kHz is like the next octave's A note.
While you scan this octave, you have resonance with all the other octaves going all the way up the piano.
If you get a hit on a C note, perhaps it was resonating with the C note 3 octaves higher and not directly on the C note found within the scanned octave.
152 kHz - 304 kHz is the next octal range, then 304 kHz - 608 kHz is the 3rd octal range. Finally 608 kHz - 1.216 MHz would be the 4th octal range. So 76 kHz to 880 kHz is covered within 4 octal ranges.
Thus, resonant power is not an issue like it would be if you were trying to scan an octal range that was say 16 octaves away from a pathogenic MOR.
Hope this helps put it into a usable perspective.
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