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Originally Posted by old_tv_nut
Pete,
What leads you to believe that only seven tones were used?
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Wayne,
The schematic is too course to interpret circuitry, but you can see concentrations of circuits, and they always appear in a group of seven, never fourteen. You can see it in both the remote unit and the receiver portions of the schematic .
If you look at the receiver assembly drawing posted above, you see the seven-in-a-set occurring there too. Take the seven circles along the bottom in line with the power transformer. There seems to be a frequency associated with each one. "OFF ON" COIL 43.32 KC and "VOLUME" COIL 28.2 KC or something like that. Hard to be exact and say for sure, but I assume they are the L in LC tanks used in circits that separate/detect the tones.
If each function used two frequencies, I'd want to see twice the coils...?