The antenna fed by a coupling
loop. For simplicity of the design the coupling loop made from
the feeding coaxial cable. Figure 3 shows the coupling loop before it is circulated to
loop. Length of the coaxial cable to be used for the coupling
loop is 200- mm. Plastic from the length of the coaxial cable
is removed on to 10– mm in the center and from two ends. Then
braid of the coaxial cable is removed at the center. Inner conductor
is soldered to the braid at the far (right) end of the length.
Then the cable is turned to loop.
Far end of the length is soldered to the first (left) side of
the prepared cable. (In Russia the method of the making the coupling
loop sometimes is named “method of the DF9IV”) The coupling loop
is fastened to the upper part of the antenna’s loop with help
of a Scotch. Figure 4
shows the picture of the antenna. Capacitors are in the plastic
box. Horizontal wires have diameter 2... 3- mm. Copper strand
wire or antenna cord may be used for those ones.