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| Thus, the requirements of high selectivity and good quality playback contradict each other. The following paragraphs will show how this contradiction is allowed. The most simple are the radios of direct amplification. Usually they are used for receiving radiotelephone signals - speech or music. Fluctuations taken aerial act on the input circuit, which is a circuit or system of units. Input circuit provides a selection of the desired signal station. Power high frequency (UHF) contains one or two stages of amplification with tubes or transistors. Lamp load is oscillating circuit. In the detection step is converted modulated waves of high frequency oscillations in the corresponding transmitted signal. Detector can serve as a lamp or a semiconductor diode. Power of low frequency (VLF) consists of one or two amplification stages of low frequency oscillations with tubes or transistors. Load of such a receiver are the phones or loudspeaker. Under the scheme of direct amplification often collect amateur radio receivers on the transistor. |