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Long Range Fm Transmitter With Audio Modulation
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PROJECT DESCRIPTION

The aim of this project is to develop a low cost long range FM Transmitter with audio modulation. The FM transmitter has 3 stages, A (VFO) Variable frequency Oscillator (30 mw), a class C driver stage (150 mw) and a class C final power amplifier (1 Watt). Basically every FM Transmitter has to have a Voltage Controlled Oscillator (VCO). This is a high frequency oscillator whose output frequency changes based on the voltage applied at a particular control point. This is a variable frequency oscillator (VFO).Q1 with its associated components form the VFO.

The VFO output is fed to Q2. Q2 being an emitter follower does not load the VFO but amplifies the power only. Emitter follower output is fed to the final RF power amplifier Q3, the output of which feeds the tuned circuit. Several capacitors are used on the supply rail for HF filtrations .Feeding the VFO transistor Q1 directly with a microphone at its base it becomes a FM Transmitter circuit. At 12 volt DC it will deliver 1 watt RF power at 9 volt little less. With Yagi antenna at both at transmitter and receiver end looking each other at line of sight distance, the range can be up to 5 KM. The yagi antenna being very big, the design and fabrication details are only provided.

This concept can be extended and implemented in colleges or a university, where the latest happenings in a college can be known to the students by tuning to the frequency using an FM receiver.

Note:- The project is supplied with a stick antenna. However a yagi antenna as per the design supplied can be assembled by the user.

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PROJECT HIGHLIGHTS
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Call/mail for Tech Support from 10 am - 7 pm.
BLOCK DIAGRAM
Hardware Requirements
  • Transistors
  • Coils
  • Resistors
  • Trimmers
  • Capacitors & Antenna
Software Requirements
    None
Q & A
Q:  What is Audio Modulation?
A:  Audio modulation is modulating a audio signal with a carrier signal of higher frequency, so as to enable long distance transmission.
Q:  What is the range?
A:  The range is 20-30meter with GP or stick antenna or Yagi antenna up to 2KM
Q:  What is the FM band to receive the signal?
A:  The FM band is 88 to 108 MHz
Q:  Can any audio song be transmitted?
A:  Yes, audio song can be transmitted.
READ WHAT OTHERS HAVE SAID
Average Rating
 5/5
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Showing 1 of 1 reviews
Jaykumar S Birajdar, Solapur on 2nd December, 2014, 03:49 PM

The Kit got delivered on time with right components.Yes, my queries are getting resolved while building up my project with the help of audio visuals and provided along with the Kit. The documentation part is technically very good and I got good support with all the documents provided technically.I have just started working on my project due to my exam schedule but till what I did is a good experience for me.I recommend kit to everyone because of your good service.

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