Active Antenna I

Posted on Aug 7, 2012

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
Click here to download the full size of the above Circuit.

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.

Leave Comment

characters left:

New Circuits



Popular Circuits

RC Low-Pass passive Filter
Power supply protection circuit
Cold-Cathode Fluorescent-Lamp Supply
Lighting Circuits Connections for Interior Electrical Installations
switch mode power supply design of current load sense circuit
propeller receiver
phone ringtone generator circuit
rem bell circuit
Help in identifying the schematic symbol
Simple Moisture Detector
4h 556 composed of a timing circuit diagram