KXPA100 features include:

• 100 W output on 160-6 m with 5 W input typical
• 13.8 VDC powered; 20 A typical current drain
• 7 lbs with KXAT100 installed.  10 x 5.125 x 4.25"
• Compact unit ideal for both desktop and mobile use
• Solid-state diode T/R switching — fast, silent T/R and QSK
• Large convection-cooled heat sink for reliable and quiet operation
• Modern design with rugged MOSFET output stage
• Internal wide-range automatic antenna tuner (KXAT100 ATU option)
• Second antenna jack provided with KXAT100 ATU option; controlled by KX3's ANT switch
• Fast, bright LED bar graphs for power and status; KXAT100 ATU option adds SWR bar graph
• Seamless integration with the Elecraft KX3 transceiver
• Works well with any low-power transceiver, requiring only RF and PA KEY inputs
• RF-based frequency counter automatically switches bands with any rig
• Optional band-data input support the K3/10, KX3, Yaesu FT-817, Icom IC-703, and other rigs
• Dual APP power connectors for additional friction-fit if needed (mobile); optional daisy-chaining of 13.8 V to power rig
• Optional KXPACBL adapter connects KX3 to the KXPA100 with a single cable for keying, band data, and control
• KXPA100's PC port allows use of remote-control and logging applications with the KX3 without software configuration changes
• KXAT100 internal ATU option matches 10:1 SWR (5:1 typical on 160 m and 6 m); uses Elecraft's fast matching algorithm
• KXAT100 ATU settings saved per band, per band segment, and per antenna for instant recall

Installation of subsequently ordered extensions KXAT100 to the KXPA100 by QRPproject including adjustment work

Used to break out the computer control and key out

signals separately. These can then be connected to an Elecraft KXPA100 amplifier via its adapter cable.