Position: Index > Unclassified >

Active Antenna I

2017-09-12 17:00  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.


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

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.



Reprinted Url Of This Article:
http://www.next.gr/rf/antennas/active-antennas/active-antenna-i-l13921.html