Medium Wave Transmitter Circuit

An am transmitter for medium wave the spitfire duration.

Medium wave transmitter circuit.

The transmitter circuit is capable of storing the energy for the oscillation as it is a derived from the inductor and capacitor lc circuits. There are two parts comprising this transmitter the rf oscillator and the audio amplifier. Decision on rf protocol for two way star network incorporating contention based medium access. If the frequency of the oscillations is high enough in the radio frequency range above about 20 khz the oscillating coupled electric and magnetic fields will radiate away from the antenna into space as an electromagnetic wave a radio wave.

This long wave radio and medium wave radio receiver circuit diagram is designed using tba120 integrated circuit and common electronic components. 13 8 kv medium voltage issue. Medium wave modulator circuit diagram the modulator is designed as an emitter follower that modulates the supply voltage of the output amplifier. In simple radio receiver circuits the tuning is adjusted by varying the number of turns of wire in the coil.

Generalized schematic diagram of an am transmitter converted from a vintage tube radio. This type of circuit tends to block any ac signals at a frequency above or below the resonant frequency. Radio workshop 24 009 views. You can adjust the resonant frequency by varying the amount of inductance in the coil or the capacitance of the capacitor.

Medium wave transmitter constuction problems. Speed of a radio wave in a medium. A generalized schematic diagram of a medium wave transmitter which covers a standard broadcast band 530 1700khz converted from a 4 or 5 valve superheterodyne radio is shown in fig. Tuning stage of this long wave radio and medium wave radio receiver also serves as active antenna that can be favorably positioned to get the best reception possible.

The potentiometer can be adjusted to obtain the least distortion and the best sound. The spectrum provides about 120 channels with limited sound quality. As the medium wave band is still mono the two input channels are merged. Propagation in the night allows strong signals within a range of about 2000 km.

During daytime only local stations can be received. Medium wave band a part of the medium frequency radio band used mainly for am broadcasting with an allocated frequency range of 530 khz to 1610 khz extending to 1700 khz in the western hemisphere. The audio i e input signal obtained from the mic is passed through the base of the transistor in order to modulate the output signal of the lc circuit in fm i e frequency modulation wave form. Medium wave mw is the part of the medium frequency mf radio band used mainly for am radio broadcasting.