On 10/27/10 1:23 PM, Marcus D. Leech wrote:
Looking at the flow-graph, it seems like the modulation "bits" are
running at the same rate as the carrier frequency, which won't work--not
even slightly.
Generally in AM/ASK, the modulation frequency is *much* lower than the
carrier frequency, my gut is that you'd need at least several cycles
of carrier between each bit.
In addition, the two sample rates flowing into the multiplier are
different. The 47 kHz "carrier" has a sample rate of 3Meg, while the
digital data has a sample rate of 47K. You will need to upsample
your data stream to the same sample rate as the carrier. Since there
isn't an integer ratio between the two rates, you'll have to use
the rational_resampler block.
@(^.^)@ Ed
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