But the only change is increase in transmitted power, In this project, I am increasing transmitter power level by connecting extra battery, The other way is using variable power supply source As per radio theory, high frequency signal should travel long distance means high frequency signals should cover long range.
But range is based on several factors like input power, antenna size etc. If we want to increase the range, we can increase by increasing input supply voltage to the transmitter section. The new idea in this project is, to increase the transmitting range by increasing transmitted power.
That "kinda" works. The "power" your transmitter will get will be no more what your controller data pin can supply. Of course, at least Arduino type controllers can supply some current from data pin (LEDs light up) but one can't expect it to be a proper supply for the transmitter.
The experiment shows that the power transmission to the antennas can be increased by increasing the supply voltage. The operational range of the RF module is directly proportional to power transmission. It can be doubled by doubling the supply voltage. Questions related to this article?
In other words transmitter can transmit signal up to some distance. After that, RF signal will totally corrupt because of noise (EM wave becomes plane wave). In current system, different frequency modules works with different ranges, like 434 MHz RF module normally works 70 to 100 meters.
More powerful transmitters and more sensitive receivers are, of course, more expensive than standard grade units, and a more powerful transmitter is also going to need much more power to operate – chewing through batteries maybe ten times faster, and/or becoming a power-hog when you’re off-grid and power is precious and limited.