Elecraft KAT500 Serial Command Reference - Manual (Page 13)

If there is no memorized tuner setting for the specified frequency, adjacent memories are searched
above and below the specified frequency, to the band edges, until a suitable memory is found.
Memory Recall Tune may be deferred until the current transmit power drops below the AKIP power
threshold.
MTA (Memory Recall Tune on frequency change in mode AUTO, GET/SET)
GET format: MTA;
SET/RESPONSE format: MTA1; or MTA0;
Enables (MTA1;) or disables (MTA0;) Memory Recall Tunes when transmit frequency changes are
detected while in Mode AUTO.
When enabled, the KAT500 performs Memory Recall Tunes as the transmit frequency changes within
the current band while in Mode AUTO, even if the VSWR is below the Auto tune VSWR threshold.
When disabled, the KAT500 performs Memory Recall Tunes, and, if necessary, Full Tunes, only when the
VSWR rises above the VSWR Auto tune threshold (see the ST command).
MTA is enabled by default. MTA was added in firmware version 1.28.
MTM (Memory Recall Tune on frequency change in mode MAN, GET/SET)
GET format: MTM;
SET/RESPONSE format: MTM1; or MTM0;
Enables (MTM1;) or disables (MTM0;) Memory Recall Tunes as transmit frequency changes are detected
while in Mode MAN.
When disabled, the KAT500 performs Memory Recall Tunes only on band and antenna changes while in
Mode MAN.
MTM is enabled by default. MTM was added in firmware version 1.28.
PS (Power off/on, GET/SET)
GET format: PS;
SET/RESPONSE format: PS0; or PS1;
Turns the KAT500 ON (PS1;) or OFF (PS0;).
The KAT500’s microcontroller operates whenever DC power is applied. LEDs and relays are off (Antenna
1, bypassed) when the KAT500 is “logically off”. See the SL command.
This command may be ignored while transmitting.
PS; and PS1; were added in firmware version 1.20.