80m and 160m dual-band loop antenna
The antenna helps to reduce the noise caused by the power line. A 3-foot-diameter plastic "hula hoop" or a catheter with a lead and platinum sheath on the outside is used as L1 and L2, L1 two-turn wire, L2 is a turn wire, and they are both worn Through the ring body. S1 is used to select the 160m band or 80M band for operation. Q1 and Q2 form the preamplifier of the loop antenna. The antenna is not used for transmission, and the value is used for acceptance.
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