What can a software defined radio do?

An SDR performs significant amounts of signal processing in a general purpose computer, or a reconfigurable piece of digital electronics. The goal of this design is to produce a radio that can receive and transmit a new form of radio protocol just by running new software.

How is amplitude modulated signal transmitted?

Amplitude modulation is a process by which the wave signal is transmitted by modulating the amplitude of the signal. It is often called AM and is commonly used in transmitting a piece of information through a radio carrier wave. Amplitude modulation is mostly used in the form of electronic communication.

How are radio signals decoded?

As the receiver knows the frequency of the carrier signal, the data can be decoded by reversing the modulation process, i.e. demodulating the signal. For example, a signal at 437.44MHz represents 1 and a signal at 437.46MHz represents 0. Then, you just quickly change between the frequencies based on your data.

Why the radio station is transmitted the information using FM modulation techniques and television station transmitted the information using AM modulation techniques?

Frequency modulation (FM) A simple method to achieve FM is to vary the capacitance of a resonant LC circuit in a transmitter. For example, commercial stereo FM broadcasting (88–108 MHz) is assigned a bandwidth of 200 kHz in which to broadcast 15 kHz of audio-music bandwidth.

Can a modulating signal be transmitted without modulation?

With no modulation, the AM carrier is transmitted by itself. When the modulating information signal (a sine wave) is applied, the carrier amplitude rises and falls in accordance. The carrier frequency remains constant during amplitude modulation. Analog amplitude modulation is widely used in radio.

How information is transmitted through radio waves?

How do radio waves carry information? At one end, a transmitter “encodes” or modulates messages by varying the amplitude or frequency of the wave – a bit like Morse code. At the other, a receiver tuned to the same wavelength picks up the signal and ‘decodes’ it back to the desired form: sounds, images, data, etc.