Making transmitter fm 20 km

Creating fm transmitter with a range of 20 km

Creating the program in FM transmitter power of 5 watts and a range of 5 to 20 km is placed.

Amy FM radio receiver circuit may be of any use (eg mobile radio).

This circuit can not be said to be exact because its range is different depending on the context in which it is located. The range of the transmitter with respect to the 5 watts of between 5 and 20 km.

This includes the following sections:

The introduction of the required parts

A description of the modulation

Creating transmitter circuit with explanations and tips

Creating inductor circuit

And Creating PCB printing method and ironing

List of circuit components:

• Resistance R1 = 12K ohms
  
• Resistance R2, R3, R4 = 68K ohms
  
• R5 = 150Ω Ohm resistor
  
• Resistance R6 = 22K ohms
  
• Resistance R7 = 10K ohms
  
• R8 = 56Ω Ohm resistor
  
• Potentiometer P1, P2 = 100K ohms
  
• Electrolyte capacitor C1, C2 = 4.7uF / 25v
  
• Electrolytic capacitor C9 = 10uF / 25v
  
• Ceramic capacitors C3, C5, C8 = 10pF
  
• Ceramic capacitor C6 = 10nF
  
• Ceramic capacitors C7, C11, C13 = 100nF
  
• Trimmer capacitor (variable) C4 = 40pF
  
• Trimmer capacitor (variable) C10, C12, C14, C15 = 65pF
  
• Transistor TR1 = BF244 or BF245
  
• Transistor TR2 = 2N2219A
  
• Transistor TR3 = MRF237
  
• Varicap Diode DV1 = BB109 or BB105 or BB405 or similar