FM signal jammer on two transistors 2sc3355

A simple FM jammer capable of jamming radio signals at frequencies of 88–108 MHz. The generator is made on two 2SC3355 transistors. Windings L1–L2 contain 7 turns of wire with a diameter of 0.8 mm each, wound on a mandrel with a diameter of 4 mm. Antennas A1 and A2. The length of A1 is 14 cm, and A2 is 45 cm. To tune, a ferrite core must be screwed into coil A2. I don’t know what brand of ferrite I have. Such ferrites can be found in old radios

For tuning, you can use a high-frequency probe made of two diodes and a light-emitting diode. When one of the probe antennas touches the collector of the VT2 transistor, the light-emitting diode should shine brightly, which will indicate good signal strength, although the transistors are low-power

Set the radio receiver at a distance of 5 meters from the transmitter. Screw the ferrite into the L2 coil until the FM station signal is completely suppressed. I live on the outskirts of the city, and the transmitter jams signals at a distance of up to 15 meters