Jared,
AJ pretty much summed up what you see. The center frequency gets set, then the frequency modulator (which offsets the center frequency) gets activated, then the modulation pattern begins looping.
I am looking at adding packet-based digital modulation with a 2-508 symbol packet followed by an “off” period of up to 65,000 symbols. This could easily give you a 1% duty cycle. Let me know if you are interested. The only (minor) challenge is I would have to convert FSK math from frequency modulation to its quadrature amplitude equivalent to enable this.
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