Ryan Malloy cb77b18a9c Add full downlink demo: PCM telemetry + crew voice on one carrier
Assembles the complete Apollo USB downlink signal from individual blocks:
PCM frames on 1.024 MHz BPSK + crew voice on 1.25 MHz FM, both PM-modulated
onto a single complex carrier. Receives and splits into decoded PCM frames
and recovered voice audio.

Clean: 399/402 frames, 8s voice. At 25 dB SNR: 395/402 frames.
2026-02-22 18:06:22 -07:00
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