After the antennas have been excited by these currents, they start radiating radio waves. Transmitters are additionally utilized for the purposes of broadcasting and are vital equipments of communication that utilizes radio technologies (Rider, 2008). This includes equipment like cell phones, Bluetooth along with computer networks that utilize wireless technology. Transmitters are usually limited to use in equipments that are used for generating radio waves for the purpose of enabling communication (Uhrig, 2006).
There are mainly three types of transmitters which are the beltpack, plug-in and handheld transmitters. The design of beltpack transmitters shows that they should be placed on the user’s body and is normally used with the help of a microphone situated outside the electronic device. They provide a lot of power to the electronic devices using batteries located on their inside (Brunetti, 2009). The plug-in type of transmitter on the other hand is made so that it can be inserted into standard dynamic microphones through their connectors. The plug-in transmitters are commonly utilized by television crews that are carrying out activities in the field. Lastly, the handheld transmitters combine microphone elements along with transmitters that have been built into one assembly line.
The transmitters are commonly used in devices that will be utilized by vocalists or speakers who prefer holding onto a microphone as they communicate (Poole, 2011). Question Two: What Are Oscillator Circuits And Which Oscillator Have Been Used In The Transmitter? Oscillator circuits are electronic circuits that usually produce repetitive electronic signals which are referred to as sine or square waves. The types of signals that are generated using these oscillator circuits are broadcasted using radio along with television transmitters. The main trait of an oscillator is the frequency of its output signal (Elliot, 2011). Inverters are good examples of oscillators that are utilized for the purpose producing high powered alternate currents (AC) output from direct current (DC) supplies. There are various types of oscillators that have been utilized in transmitters which are namely the tuned-plate, tuned-grid, Hartley, colpitts, negative transconductance and electron-coupled oscillators (Rider, 2008). The oscillator used in the transmitter is the tuned-plate one and has been preferred because it has the ability of being directly earthed without having the need of directly using a blocking capacitor. It has also been used because in helps in maintaining the amplitudes of the oscillations over a certain tunable range (Elliot, 2011). Through its mechanisms of tight coupling along with maintaining very low values for its mutual inductance it is able to maintain stability in the frequencies that are being transmitted (Uhrig, 2006). Question Three: What Are Filter Circuits And What Are The Purposes Of Using It In The Receiver? Filter circuits are circuits that have been designed for the purpose of performing the task of selecting and filtering a single or a frequency particular range from a mix of frequencies that may be found within a particular circuit (Brunetti, 2009). They are normally used in high performance receivers in case a series of frequencies require amplification or suppression for production of quality sound or improving the efficiency of power. They are also used for the purpose of conditioning voltage waveforms that are non-sinusoidal in various power circuits located in the receivers (Rider, 2008). Due to the sensitivity of an electronic device to harmonics, there is a great need to condition the power entering the device to ensure