Active Antenna I

  
This circuit is designed to make a short pull-up antenna perform like a long wire antenna, while offering no voltage gain.
Active Antenna I - schematic

The circuit boosts the receiver"s performance only if the signal at the antenna is of sufficient level to begin with. This circuit takes a short pull-up antenna that has a high output impedance and couples it to the receiver"s low input impedance through a two-transistor impedance-matching network. Transistor Ql"s high input impedance and high-frequency characteristics make it a good match for the short antenna, and Q2"s low output impedance is a close match for the receiver"s input. This circuit is usable over the range from 100 kHz to 30 MHz.




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