Overview

MFJ 933 Small High-Efficiency Loop Tuners™

Drape a wire around a bookcase or window and attach both ends to an MFJ 933 small high-efficiency Loop Tuner™ and they instantly turn into small, high-efficiency, multi-band transmitting loop antennas! You can operate 5.3 to 30 MHz with a full 150 watts. No ground, radials, or counterpoises are needed. The excellent performance of a high-efficiency small loop antenna is legendary and well proven by users all over the world. You'll radiate a low-angle DX signal that literally rivals full size dipoles and works incredible DX! They're very quiet receiving antennas; you'll hardly notice static crashes. Their high-Q reduces QRM, overloading, and harmonics. MFJ small high-efficiency Loop Tuners™ are perfect for apartments, antenna-restricted areas, and portable operation. A 13 ft. wire formed into a loop operates 30-20 meters, 4 ft. for 17-10 meters, 7 ft. for 20-15 meters, and 28 ft. for 60-40 meters. You can tune any shape of loop--a circle, square, rectangle, or any odd shape--however, a quarter wavelength wire shaped as a circle is the most efficient. A given wire length covers about a 1.5 to 1 frequency range (i.e. 7-10/18-28 MHz, etc.). Exact frequency coverage depends on the wire length, loop shape, surroundings, and height above ground. Additional features include the MFJ low-loss butterfly loop-tuning capacitor, no rotating contacts, and an easy-carry handle. They even include a PVC cross mount on the cover.

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