7 Long Range FM Transmitter

This simple transmitter can transmit FM (frequency modulation) signals more than a mile away. Adjust trimmer C9 to fine tune the transmitter and use battery as a source to minimize noise.
Part List:
R1, R3, R9, R10 - 10 kilo ohms 1/4W
R2 - 22 kilo ohms 1/4W
R4 - 100 kilo ohms 1/4W
R5 - 1.2 kilo ohms 1/4W
R6 - 47  kilo ohms 1/4W
R7 - 120 ohms 1/4W
R8 - 390 ohms 1/2W
R11 - 47 ohms 1/4W
Pot1 - 5 kilo ohms potentiometer
C1, C5 - 0.33uF electrolytic capacitor rated 25V
C2 - 22uF electrolytic capacitor rated 25V
C3  - 10uF electrolytic capacitor rated 25V
C4 - 220nF
C6, C7 - 1000pF ceramic capacitor
C8 - variable capacitor not less than 40pF
C9 - variable capacitor not less than 22pF
Q1, Q3 - 2N2222A or similar NPN transistor
Q2 - 2N2906A or similar PNP transistor
L1 - VK220J or similar RFC inductor
L2 - 3 turns 18AWG magnet wire wound in 10mm diameter plastic former
L3 - 2 turns of 18AWG magnetic wire wound close to L2 using the same core where L2 is wound. See diagram below.

2N2906A pinout

2N222A pinout

Inductor L2 and L3 construction

Note: This transmitter is for educational use only. Long range transmitter is illegal in some countries thus use it at your own risk.