| 摘要 |
<p>The antenna has its conductor secured on the vehicle windscreen, or embedded in it. It contains an amplifier circuit with a high-ohmic transistor input in amplitude modulated region and with a low-ohmic output resistor of less than 100 ohms. The amplifier circuit has a transistor (16) as its final stage, which is connected in a collector-base circuit. Alternately the amplifier final stage may be in the form of a push-pull stage with two complementary transistors. Between the socket point of the antenna conductor and the input of the amplifier transistor may be incorporated a pi-element consisting of the capacitors and an inductance, rated to match the transistor input with respect to the noise equalising.</p> |
