Body of the antenna made of 20 ferrite rods. It was used rods
with mu= 400, length = 200- mm and diameter = 10- mm. The rods
were installed in ring similar to a stator of an electric motor.
Diameter of the ring was 90- mm. The rods were installed with
step in 18- degree. Copper wire in diameter 1- mm (18- AWG) was
used for the antenna inductors. It was no gap between coils of
L1 has 2 x 8 turns. Inductor
L2 has 2 x 2 turns. All inductors are coiled in one direction.
Left and Right parts of the inductor L2 connected symmetrically
to the inductor L1. Capacitor C2 provides matching with the transceiver.
(I. G.: I made the antenna
some years ago. I recommend use a variable capacitor- 3 x 12x495-
pF instead of the fixed one C2.) Antenna may stand
RF- Power up to 10- Wtts. Capacitor
C1 should have air gap for transmitting variant of the antenna.
The Ferrite Magnet Antenna (at the testing in the Air)
worked good from 1750- kHz to 3660-kHz. Efficiency of the antenna
was low at the frequencies higher the 3700- kHz.