MFJ-933 - Small Loop Tuner
LOOP TUNER, 3.5-30 MHZ, 150W
MFJ Small, high efficiency Loop Tuners™
Click here to read Phil Salas review of the MFJ-936B, MFJ-935B, and MFJ-933.
Drape a wire around a bookcase or window and attach both ends to this new MFJ Small Loop Tuner™. It instantly turns into a small, high efficiency multi-band transmitting loop antenna! You can operate 5.3 to 30 MHz with a full 150 Watts. No ground, radials or counterpoises 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 work incredible DX!
It's a very quiet receiving antenna; you'll hardly notice static crashes. Its high-Q reduces QRM, overloading, harmonics. It's perfect for apartments, antenna restricted areas and portable operation.
A 13 foot wire formed into a loop operates 30-20 Meters (4 foot for 17-10 M; 7 foot for 20-15 M; 28 foot for 60-40 M). You can tune any shape loop; circle, square, rectangle, any odd shape. A quarter wavelength wire shaped as a circle is the most efficient.
A given wire length covers about 1.5 to 1 frequency range (i.e. 7-10 / 18-28 MHz, etc.). Exact frequency coverage depends on wire length, loop shape, surroundings and height above ground. Has MFJ low loss Butterfly loop tuning capacitor, no rotating contacts. Easy-Carry handle. Mount for PVC Cross on cover.
See June, 1986, QST or recent ARRL Antenna Handbook for more details on small, high efficiency loops.
MFJ-936B - For home/portable stations. Has relative RF antenna current meter with sensitivity control and 30/300 Watts Cross-Needle SWR/Wattmeter.
9 ¼" x 5 ½" x 9 ½".
MFJ-935B - For home/portable stations. Smaller and lighter than the MFJ-936B. Relative RF current meter with sensitify control.
6 ¼" x 5 ½" x 9 ½".
MFJ-933 - For home/portable stations. Same size, dimension, and feature set as the MFJ-935B, but without the RF current meter.
6 ¼" x 5 ½" x 9 ½".