Information for a Kenwood AT-230 Antenna Tuner

Written by andrew tennyson
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The Kenwood AT-230 is an amateur radio antenna tuner manufactured by Kenwood, a company with its U.S. headquarters in Long Beach, California. The AT-230 consists of a through-line RF watt meter, an adjustable antenna coupler and an SWR meter.

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The AT-230 was designed to be coupled with a Kenwood HF transceiver. The unit measures 5 1/4 inches tall, 7 1/16 inches wide and 11 5/16 inches deep. It has a net weight of approximately 7 0.226 kilos.


The AT-230 was designed for use on amateur radio bands, with frequencies between 1.8- and 30MHz. The built-in watt meter can function in either the 20 or 200 watt range. The antenna coupler section of the AT-230 has an input impedance of 50 ohms. The watt meter also has an impedance of 50 ohms.


The unit features UHF Type 50 input connectors. The antenna coupler features insertion loss of less than 0.5 dB at optimum match. The watt meter section of the AT-230 has measurable RF power that can be switched between 20 and 200 watts.

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