Note
The KAT100 automatic antenna tuner is designed for use with the Elecraft K2/100 transceiver, as well as the basic K2. It can match loads with SWRs in excess of 10:1, and can easily handle 150 watts of transmit power.
Ten front-panel LEDs provide an accurate, real-time SWR indication during transmit. The KAT100 also includes two antenna jacks–the equivalent of two auto-tuners connected to the rig.
Because of its tight integration with the K2, the KAT100 offers many
advantages over generic external auto-tuners:
• Automatic power reduction to 2 or 20 watts (in low- and highpower modes) when the K2's TUNE switch is pressed; auto-tune is possible with as little as 0.2 watts in low-power mode.
• Direct display of power, SWR, and other data on the K2 LCD.
• ATU can be configured using the K2 menu.
• K2's POWER control setting indicated by two LEDs.
• K2's ANT 1 / 2 switch selection indicated by two LEDs.
• L/C settings stored in EEPROM for both antennas on all bands.
• SWR LEDs can use bar or dot mode (set by GRPH menu entry).
• All LEDs have two brightness levels (set by LCD menu entry).
The ATU comes in two enclosure styles, both of which match the K2:
• The KAT100-1, shown on the cover of this manual, is housed in a low-profile cabinet, intended to be placed beneath the K2. Two anti-slip brackets are provided, so the K2 will remain in position even if the KAT100-1 is tilted up.
• The KAT100-2, shown in the photo at right, is intended for side-by-side arrangement with the K2. It includes front and rear panels that match the K2-sized EC2 enclosure kit. The EC2 cabinet provides plenty of room in the top
cover for your own accessories.
