Active Antenna by MPF102
This be Active Antenna circuit for boost frequency all signal give the power goes up. By this circuit has tall rapidity cover the frequency about 10Mhz – 110MHz by have electronics equipment the important be FET and Transistor the small-sized. It make a signal that change antenna the power goes up plentiful.
Antennas that are much shorter than 1/4 wavelength present a very small and highly relative impedance that is dependent on the received frequency. It is difficult to match impedances over a decade of frequency coverage. Instead, input stage Q1 is an FET source-follower. A high-impedance input successfully bridges antenna characteristics at any frequency.
Read Source :
http://www.circuitsuggest.com/active-antenna.html
Categories: RF-Radio Frequency Tags: active antenna, MPF102, RF booster
Active Antenna for 10KHz to 100MHz by BF247
This active antenna schematic can be used to frequency range from 10 KHz to 100 MHz. The length of the Antenna can be between 0.5 to 1 meter long. The power consumption is 20-30mA.
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read more: http://www.next.gr/inside-circuits/Active-Antenna-Circuit-for-10KHz-to-100MHz-l4357.html
Categories: Power Amplifier, RF-Radio Frequency Tags: active antenna, RF antenna amplifier, RF booster
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