![]() It is a bridge that makes it very compatible. It results in a circuit with a very high input impedance. We set it as the source follower circuit. We should use the input of this circuit as a FET better than the normal transistors. Therefore the antenna has a very high reactive impedance. In general, the length of the antennas used with shortwave radios is usually 1/4 of the wavelength. Low frequencies will have a higher gain than a high-frequency band, such as 1-18 MHz will have a high gain of about 20 dB and the gain will be reduced to around 14dB when using a 30MHz frequency. This circuit has a gain of around 14-20 dB, covering short-band frequencies to certain amateur frequency bands in the range of 1-30 MHz. See the diagram below, high gain active antenna circuit. Until most people are unable to find enough space to install the antenna. But normally we use with low band frequency – VLF (100kHz or more) Up to 30 MHz.īecause of the antennas of these frequencies are very long. This active antenna circuit can be designed to be used with any frequency band. Learn: High impedance preamplifier How it works Which is mainly designed for 50 ohms impedance antenna. In addition, this signal amplifier from this antenna, also useful as impedance matching.īetween the antenna (high impedance to the operating frequency Because the length is too large) to match the input impedance of the radio receiver. And sent to a tuner or receiver to the receiver.įigure 2 the component layouts of this circuit High Gain Wideband Active Antenna amplifier The Signal at the Q1 will be expanded to increase. You can use a special access code 50 ohms, the antenna on the circuit at all. so circuit held, in conjunction with the bass, a nice low output impedance. High-frequency range VHF, inductive antenna, to the emitter pin of the transistor Q1. The booster circuit is one, serves to amplify the signal strength only. If high-frequency signals, in particular, its VHF. This is Wide band high-frequency amplifier circuit, a Wide frequency band between 75-150 MHz, Using transistors, a PNP amplifier. If the efficiency of the first circuit Not enough for you.
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