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> Mfj-935B loop tuner, 3.5-30MHZ, 150W, w/current meter
Mfj-935B loop tuner, 3.5-30MHZ, 150W, w/current meter
Loop Tuner TM is a small, versatile, high-efficiency device that turns any wire loop into a high-efficiency multi-band transmitting loop antenna system designed for 50-ohm use at 150 Watts maximum input (all modes). It consists of two functional units:
* Wire Loop(s) (not included)
One function of the MFJ-935B Loop Tuner TM tunes/resonates various lengths of wire into a very Hi-Q tuned-circuit used as a transmitting loop antenna. It uses an MFJ low-loss Butterfly capacitor with no rotating contacts (available separately) in this circuit. The second function is a matching network that serves to match the Hi-Q transmitting loop circuit to any length of 50-Ohm coaxial cable.
No ground, radials, or counterpoise system is required or needed. The MFJ-935B Loop Tuner TM tunes any shape loop: circle, square, rectangle or any odd shape. However, a wire approaching a quarter wavelength shaped as a circle is the most efficient configuration.
The MFJ-935B Loop Tuner TM uses fixed wire lengths, which cover about 1.5 to 1 frequency ranges (i.e. 28 18 or 10 7 MHz, etc.). Exact frequency coverage depends on each individual installation configuration involving choice of wire length and diameter, shape of loop, Loop Tuner TM height above ground level, and operating environment. Figure 2 illustrates the MFJ-935B Loop Tuner TM.
The MFJ-935B Loop Tuner TM mounts an assembled PVC Cross provided in the MFJ-57B Loop Antenna Kit by inserting the cross into a PVC receptacle mounted on the top of the unit s cover. This kit provides a means to operate 20 and 30 meters using an insulated 10-gauge flexible wire loop fitted with direct contact low-resistance lugs and strung on the PVC after assembly. Assembly takes less than five minutes from packaged kit to ready for operation.
Powerless: No power supply required.
Maximum Input Power: 150 Watts (all modes)
Easy-to-Read Loop RF Current Indicator: 0 to 100 scale with adjustable sensitivity.
Small Physical Profile: 6 W, 9 D, 5 H
Low Radiation Angle: Rivals full size dipoles.
Quiet Reception: Extremely quiet receiving antenna. Hi-Q rejects out-ofband interference, reduces overloading, and rejects harmonics.
Indoor Use: Perfect for apartments & hotel/motel rooms, antenna restricted, and portable locations.
