My project is about building a radio signal strength tester for existing signal. So that you can test for superimposition of signal for your own radio project.
Background on Radio technology and Some important key points to know :-
the transmission and reception of electromagnetic waves of radio frequency
Frequency is the number of occurrences of a repeating event per unit of time.
f = 1/T
f = frequency
T = period
Wavelength can be defined as the distance between two successive crests or troughs of a wave.
L = v / f
L = wavelength
v = velocity
modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a separate signal called the modulation signal that typically contains information to be transmitted.
Demodulation is defined as extracting the original information-carrying signal from a modulated carrier wave.
the rate at which someone or something moves or operates.
Spectrum relates to the radio frequencies allocated to the mobile industry and other sectors for communication over the airwaves.
bandwidth is the maximum rate of data transfer across a given path. Bandwidth may be characterized as network bandwidth, data bandwidth, or digital bandwidth.
an electronic device for varying the frequency to which a radio or television is tuned.
licence is an official permission or permit to do, use, or own something.
you do not have official permission from the government or from the authorities to do something.
signal strength refers to the transmitter power output as received by a reference antenna at a distance from the transmitting antenna.
To increase the strength of the signal.
to decrease the strength of a signal.
device used for increasing the strength of a signal.
device used to decrease the strength of a signal.
to place or lay over or above something.
the transfer of electrical energy from one circuit segment to another.
a filter is a device or process that removes some unwanted components or features from a signal.
A process by which you remove unwanted component or feature from the signal.
An antenna is a metallic structure that captures and/or transmits radio electromagnetic waves.
gain is a measure of the ability of a two-port circuit (often an amplifier) to increase the power or amplitude of a signal from the input to the output port by adding energy converted from some power supply to the signal.
The process of absorption means that a substance captures and transforms energy.
the throwing back by a body or surface.
Noise is an unwanted signal.
A fixed and well-defined value.
A wave can be described as a disturbance that travels through a medium from one location to another location.
a distinct period or stage in a series of events or a process of change or development.
the length of the space between two points.
Series of experiment for setting criteria:-
experiment 1:- (selection of frequency spectrum for the project)
Because of demonstration purpose we are going to choose spectrum that are free from any noise. Bellow is the image of spectrum analysis for frequency spectrum.
Frequency up to 320 MHZ is filled with noise. considering per division as 160 MHZ.
List of Existing licence-exempt bands in India.
For our project 865 - 867 Mhz is the perfect choice.
experiment 2:- (To build a device that can generate 865 MHZ frequency or above 865 MHz frequency)