| 摘要 |
Amplifier for prime-band television and frequency- modulated radio signals, characterised in that the amplifier circuit includes a selective input filter, a high-gain and low-consumption amplifier produced with surface-mounted components SMD and using a printed coil, and an output filter, the radio-frequency or radio-wave signal originating from the antenna entering a Cauer-type bandpass filter, subsequently passing through a matching filter to a first amplifier stage, the radio-frequency signal being separated from the DC current by means of resistive, capacitive and radio-frequency choke elements, in that the signal enters a second amplifier stage via a multitrack attenuator, then encountering a further bandpass filter, and the signal, after passing through the amplifier stage, going through final output bandpass filtering, the said signal leaving the amplifier after this last filter so as to be mixed with the rest of the signals. <IMAGE>
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