Elecraft KXPA100 Manual - Manual (Page 32)

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 ATU Memories: The tuning solutions are stored in memory. When you return to a frequency again and
transmit, the amplifier senses the frequency and the ATU will switch to the tuning solution in memory.
Assuming you have not changed the antenna, the ATU will be ready to transmit almost instantaneously.
The ATU has a large number of memory locations to store tuning solutions for many frequencies across
the range of 1.5 to 60 MHz. Also, a separate set of memory locations is provided for each antenna
connector. See Theory of Operation on page 38 for details. ATU memories may be cleared using the
Utility program (see page 37).
If you wish to QSY as quickly as possible to various frequencies without going
through a tune operation, you can prepare the ATU by performing a tune operation
on frequencies across each band. That will store the tuning solution so the KXPA100
will be ready without retuning when you return to that frequency. The number of
frequencies you will need to perform a tune operation on so the SWR is acceptably
low on all frequencies depends upon the band and your antenna.
 Antenna Switching: Hold
A N T to switch between the ANT 1 and ANT 2 rear panel connectors. The
ATU will store the selected antenna in memory for each band and return to it automatically when you
return to that band.
When changing an antenna selection, be sure the KXAT100 has changed to the desired
band first by transmitting briefly. A short sound on phone or a dit on CW is enough to
cause the amplifier to sense the RF frequency, change to the proper band, and switch
the antenna to the one last used on that band.