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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.

PROJECT HIGHLIGHTS
Non-Microcontroller Project.
Extensive audio-visuals available.
Branding-free material.
Call/mail for Tech Support from 10 am-7 pm
All-inclusive solution kit.
Easy to use, Self-explanatory kit.
BLOCK DIAGRAM
Hardware Requirements
  • Transistors
  • Coils
  • Resistors
  • Trimmers
  • Capacitors
  • Microphone & Stick Antenna
Software Requirements
    None
OTHER INFORMATION
Battery not included in the kit due to Courier service prohibition. Please buy Lithium 9 volt battery for this project.
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
 4.7/5
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Showing 4 of 5 reviews Show All
Chennuri Prashanth, Godavarikhani on 7th May, 2014, 04:24 PM

I saw one of the project in your website then I decided to buy from Edgefx. I like my project very much and technical support was very good.

Shivam Mishra, on 11th June, 2013, 01:15 AM

I purchased Edgefx kit with your dealer JauhariInfotech-Allahabadbecause your products are fully tested and timely deliverable. Your service is awesome everything as properly working there is no problem with the elements which are used. You can improve your future delivery by reducing its cost and by purchasing better phone help line services

Rupak, on 11th June, 2013, 01:10 AM

I had No hesitations to purchase Edgefx Kits and they are easily available on the internet and with Edgefx dealer JauhariInfotech-AllahabadJauhariInfotech.

madhu, on 20th December, 2012, 08:47 PM

The given videos are very interesting and informative to know about the project. These videos given good idea about how to handle the project.

Rating Breakdown (5 Reviews)
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