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Been following AMX TX (carl) and MOODZ BI-MODAL PI-VLF TRANSMIT CIRCUIT (moodz). Both have slowed do to other projects. Tried tilt correction with LT spice. Guessing 1A/sec tilt might be ok, 10A/sec might not be ok. One screen shot with targets off, tilt corrected and not corrected. Another with quarter target enabled, same correction time as no target correction time and a correction time change to see if tilt can be corrected. Used what I think carl used to correct tilt. Works fine with no targets (corrects for circuit loses). Doesn't appear to correct tilt with quarter enabled. Wondering if something wrong with my simulation. Maybe I'm looking at it wrong? 
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Once you've corrected the tilt for the no-target case, you're done. What you see for the quarter is an alteration due to the eddy response. Remember that the TX coil and the quarter create a transformer; the TX coil affects the quarter and the quarter affects the TX coil. You don't want to get rid of this response.
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