Medium Wave Transmitter Circuit

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 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. 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. Radio workshop 24 009 views. Medium wave modulator circuit diagram the modulator is designed as an emitter follower that modulates the supply voltage of the output amplifier.

Speed of a radio wave in a medium. The spectrum provides about 120 channels with limited sound quality. Decision on rf protocol for two way star network incorporating contention based medium access. Medium wave transmitter constuction problems.

An am transmitter for medium wave the spitfire duration. 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. Propagation in the night allows strong signals within a range of about 2000 km. The potentiometer can be adjusted to obtain the least distortion and the best sound.

This long wave radio and medium wave radio receiver circuit diagram is designed using tba120 integrated circuit and common electronic components. Generalized schematic diagram of an am transmitter converted from a vintage tube radio. In simple radio receiver circuits the tuning is adjusted by varying the number of turns of wire in the coil. 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.

13 8 kv medium voltage issue. The oscillator is the heart of the transmitter which is built around q1. Radio communications digitally driven medium wave am transmitter with circuit diagram. 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.

You can adjust the resonant frequency by varying the amount of inductance in the coil or the capacitance of the capacitor. This type of circuit tends to block any ac signals at a frequency above or below the resonant frequency. There are two parts comprising this transmitter the rf oscillator and the audio amplifier. During daytime only local stations can be received.