Elecraft KXPA100 Manual - Manual (Page 29)

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You may launch a tune operation at any time while RF is applied. The tune operation
will start immediately if RF is present when you tap T U N E or it will start when you
apply RF after tapping T U N E . The amplifier is inhibited during a tune operation, so
only the RF drive from the transceiver will be present at the ATU and antenna
connector until the tune operation is completed.
 ATU Memories: The tuning solutions are stored in memory. When you return to a frequency again and
transmit, the amplifier senses the band data through the interface cable and returns the ATU to the last-
used settings on that band. If you transmit on a different frequency than the last one you used, the ATU
will immediately switch to the tuning solution in memory for that frequency. Assuming you have not
changed your station 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 41 for details. ATU memories may be cleared using the KXPA 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 stores the selected antenna in memory for each band and return to it automatically when you
return to that band.