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Here is  a serious example of downward modulation, I saw this while testing a mod out for a friend, the only way to combat this (besides reworking component values) was to lower the carrier, the modification is one for a 29 LTD, and I was trying to replicate his results.  This test was a failure.

[MEDIA=youtube]l9TnlHxJpog[/MEDIA]

This was a good read: https://www.w8ji.com/amplitude_modulation.htm