Elecraft KXPA100 Programmers Reference - Manual (Page 12)

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^EM (ATU Erase Frequency Memory, SET only)
SET format: ^EMbba; erases ATU memories for one or both antennas on band bb (See ^BN).
bb 15 is interpreted as “all bands” for this command.
a is 0 for both antennas, 1 for antenna 1, 2 for antenna 2.
Examples:
^EM011; erases just antenna 1 memories for band 01 (80 meters).
^EM152; erases just antenna 2 memories for all bands, leaving antenna 1 memories unchanged.
^EM150; erases all memories on all bands.
This command may take as long as a couple of seconds.
^EM is ignored while the ATU is tuning or the amplifier is transmitting.
^EM is used by the KXPA Utility Erase Memory dialog.
^F (Frequency Count, GET only)
GET format: ^F;
RESPONSE format: ^Fnnnnn; where nnnnn is the approximate frequency of the last transmission, in kHz.
Use ^MT to perform a memory recall tune for a specified frequency.
^FE (Cancel ATU Full Search Tune, SET only, with ^FE response)
SET/RESPONSE format: ^FE;
^FE; cancels an in-progress full search tune. If a full search tune was interrupted, the “best so far” tuner
settings are loaded.
A normal full search tune also receives an ^FE response when the tune completes. This signals “end of
tune”.
^FE is ignored if the optional KXAT100 Antenna Tuner is not installed.