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Antenna Tuner


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Amateur Antenna Tuners 


  LDG AT11

The LDG AT-11 automatic antenna tuner takes advantage of a modern microprocessor and merges it with an old network design that has been around for many years. The 68HC11microprocessor improves the L network implementation by automatically analyzing the SWR and adjusting discrete components at speeds much faster than can be accomplished manually. The tuner fits onto a 6 x 8 inch PC board and can handle 150 watts continuous, matching most unbalanced antennas from 80 to 10 meters and some on 160. The tuner makes a great addition to the ham shack with any 5 to 150 watt HF transceiver (the AT-11 does not require band or frequency data from the radio). The power requirements is 11 to 14 volts (15 to 500 ma, 250 average). The power range is 5 to 150 watts and it can tune 6 to 800 ohm loads. An optional external Balun allows the AT-11 to tune long wire, random length, and most other antenna systems.

The enclosures are made by Ten-Tec Inc (same ones that make radios). The enclosure is all aluminum is texture painted with a black top and beige front and back panels. The panels are laid out similarly to the prototypes shown in the QST article and have the silk screened labels painted on.

Copyright 2007, Universal Radio, Inc.