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Old Receiving Magnetic Loop Antennas

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ANTENTOP- 02- 2004, # 006  

Old Receiving Magnetic Loop Antennas



Figure 3  Small-sized receiving loop  of a rural Broadcasting Radio Center



Basket Loop Antenna of a Simple Tube Receiver of Direct Amplification


 Fig. 4 shows the circuit and design of a basket loop antenna intended for use in a simple three- tubes regenerative receiver for LW- MW. The receiver was described in the reference [5]. For design of the antenna a disk made of a cardboard or plywoods is used. The disk has diameter in 120 millimeters and the thickness in 3 millimeters. Five slots of 45 millimeters in the length of and 2-3 millimeters in width are done on the disk at equal distance one after the other. A special ledge for fastening the loop antenna is made on the disk. Magnetic loop antenna contained 250 turns of an insulated copper wire in diameter of 0,15-0,25 millimeters. Beginning of the reeling is up of the centre of the disk.


Taps are tapped from the loop for tuning the loop to a resonance. Taps are made from 50, 100, 150 and 200 turns. When you doing the taps, do not break off antenna wire, wind wire



Figure 4 Magnetic basket loop antenna of a regenerative receiver of LW- MW

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