Tight-lipped is true! The fccid listing has everything - except the schematic. So close and yet so far.
I initially shared your concern that the receiver might also need to be modified. However, my searches on the subject have found some incredible sleuthing by various people using data protocol analyzers & even arduinos to reverse-engineer the data packet structure.
Evidently, while an Acurite base-station can see all 433 MHz transmissions it will only display data from a compatibly formatted data packet containing an acceptable sender ID. How often suitable data packets arrive doesn't seem to come into it.
So for now, I'm maintaining some optimism that the sender can be made to transmit data packets more frequently by modifying 1 or 2 components.
I believe you're also correct that modifying things can annoy the FCC. Manufacturers are required to abide by limits on radiated power on an allocated band. An allowed strategy, roughly speaking, is to transmit above 100% in short bursts between longer silences so that the average radiated power is within limits.
However, I'm no manufacturer but a guy in Alaska where I have a square mile to myself and shortening the data packet transmit interval will not cause any interference with anyone else.
So I'll throw my original question out again to the good members of this forum - anyone feel they can pinpoint what components determine the intervals between data packet transmissions on the Acurite 606TX?
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