Elecraft KXPA100 Programmers Reference - Manual (Page 23)

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^XI (Transceiver Interface select, GET and SET)
GET format: ^XI;
SET/RESPONSE format: ^XIn; where n is one of the letters in the left column below.
Describes how the amplifier interprets band voltage changes.
Transceiver Type Band Change Radio
A (Any) Tx frequency count, serial
command Any radio that does not supply
band voltage.
D (Dynamic) (the default) Tx frequency count, serial
command, band voltages Dynamic determination,
depending on polling and band
reference voltage.
Band voltage ignored and KX3
assumed if transceiver is polling
KXPA100.
ICOM assumed if band reference
voltage >= 6V.
Yaesu FT-817 assumed if band
reference voltage < 6V.
I (ICOM) Tx frequency count, serial
command, band voltages ICOM 703, 0-8V.
Chooses Band30 for 0 volts,
Band6 for 1 volt, Band10 for
10/12 and Band15 for 15/17.
X (Elecraft KX3) Tx frequency count, serial
command Elecraft KX3
Y (Yaesu FT-817ND) Tx frequency count, serial
command, band voltages Yaesu FT-817ND, 0.33 – 3.33V.
Ignores 2m and 70 cm voltages.
Cannot select 60 meters from
band voltage.