This powerful transmitter can cover several kilometers depending only on the antenna and the topography of the location. In the oscillator, a crystal controlled BF254 transistor was used. This crystal can be any one for the FM band. To regulate the voltage in the oscillator circuit we use a 7809. For excitation we use transistors 2N3553 and 2N4428 with the voltage regulated by a 7812. In the final step, a power transistor 1N6084 for 40W was used. Exciter and output transistors must be mounted on good heat radiators. The trimmers are 1-18 pF of porcelain or plastic and all capacitors are ceramic. The unit uses a 24 V transformer having excellent filtration. The shocks are constructed as follows:
XRF1 - 28 turns of wire 32 in a cotton swab.
XRF2 - Same as XRF1
XRF3 - 12 coils of wire 18 with 1 cm in diameter in a 20 cm long ferrite core
The coils are formed as follows:
L1, L2 - 6 turns of wire 18 with 8.5 mm diameter
L3 - 4 turns of 16 with 8.5 mm in diameter
L4 - 9 turns of wire 18 with 1 cm in diameter
L5 - Same as L3
L6 - 6.5 turns of wire 16 with 1 cm in diameter
L7 - 8 turns of wire 16 with 1 cm in diameter
L8 - 5 turns of wire 14 with 1.5 cm in diameter
