Special Features:

The tuner matches a 7m; 23 ft long-wire antenna across 1.6 - 30 mhz; full automatic tuning: push the (tune) switch on the transceiver, and the at-140 adjusts immediately to swr of any frequency on any hf marine band; weather resistance: the at-140 is housed in durable, completely weather resistant asa case with a rubber gasket

Properties:

An electronic device consisting of the necessary elements to establish the upper and lower limits and to effect the variation (continuous or in steps) of the frequency of a tuned circuit by means of an integral variable capacitor, inductor, cavity or line. It is generally used for tuning radio receivers, transmitters, amplifiers, or similar items. It does not include electron tubes. See also tuning unit, radio frequency.