Featuring a 6 position antenna selector switch, the AT4K offers forward power metering in two ranges, 300 and 3000 watts.
The AT4K solves a problem suffered by the typical unbalanced tuner that has a 4:1 balun at the OUTPUT of the matching network. This exposes the balun to a wide range of impedances and reactances that it was never designed to handle.
The solution: The AT4K T-matching network utilizes a 1:1 unbalanced-to-balanced transformer in the INPUT of the network. When the network is properly tuned, a 50 Ohm impedance will be presented both to the input and output of the balun, which allows it to properly perform its important transformation job. Reviewed in Sept 2004 QST.
Add 11 Ga. (.090" thick) iridite-treated aluminum metalwork and durable powder coated finish on the front panel and top cover, and you have the AT4K, a premium quality antenna tuner.
