As a conclusion to the 10m AM modification blog, here's what the modulation looks like on a waterfall plot when tuned to "channel 12" / 29.025 MHz thanks to my KiwiSDR - transmission distance was about 2 meters into a dummy load across the bench using a clip lead as an antenna:
and here's the demodulated audio (Click here to play).
Notice the carrier is offset by about 400 Hz, probably due to the reference crystal being off in the LO. 400 Hz / 29025 kHz = 13.8 parts per million. AM cares not!
Now I have to construct a simple coaxial vertical dipole for the acid test: QSO time. I'll revisit then.
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