Hi guys… yeah “strong modulation” has nothing to do with “signal strength” … As you should know already, a passive tag works by inducting power from the mag field generated by the reader… and, to communicate with that reader it modulates the field. How does it do this? It does this by basically toggling a resistive load on the inductor coil (antenna) so that it pulls more or less power from the field. The reader can sense this and determines 1s and 0s as the power drain modulates.
Some readers require a larger threshold between median (resistance off) and dampened (resistance on)… or they have terrible receiver circuits and any noise in the environment creates problems detecting these small changes in the field… so stronger swings in power modulation is required… this is what “strong modulation” does… it increases the resistive load to swing the power draw harder when engaged… this makes it easier for readers to detect the changes… so if anything, it’s more of an error correction mechanism to overcome noise than a performance.
Nearly all performance problems have to do with the shape of the reader antenna not producing a strong magnetic coupling with the tag / implant. I hope this video helps make sense of things in this regard.