How to increase the range of this FM Transmitter...plz help...http://gp2espacio.blogspot.com/2012/10/fm-transmitter.html

 

In genral you do that by increasing the effective radiated power (ERP) in the direction in which transmission is desired. There are several ways to achieve that.

1. Use a directional antenna to focus rf power in the required direction. ERP will be increased by approx the gain of the antenna.

2. Position antenna for most direct radiation to the reciving antenna. Things like adding antenna height, positioning antenna to minimize possible interfering reflections, etc.

3. Make sure the transmitter is not on the same frequency as an interfering signal, i.e. select a clear frequency.

4. Reduce losses in the transmission line between the transmitter and the antenna so more of the transmitter power reaches the antenna.

5. Make sure the antenna is properly matched to the transmission line.

6. Make sure the transmitter is properly matched to the transmission line.

7. Redesign the transmitter to have more output power.

Any or all of the above have the possibility of increasing the range.

 

thnx sir for this.......but any other circuit.....or wht chng in this circuit is done to increase the range

 

You can check here (http://www.elecsky.com/) for higher power devices.

 

Which is likely to be illegal. Be vary cautious, HAMs and commercial radio stations will help the FCC hunt you down and prosecute you.

The USA FCC allows a transmitter 10mw or less to be operated with an antenna 10' or less without a license. The antenna is the simplest way to increase range, as has been suggested.