UNDERCOVER_SCANNER_ANTENNA

Published:2009/7/13 3:51:00 Author:May | From:SeekIC

The figure shows the schematic for the antenna circuit. Because the circuit is passive.no power supply is needed. Plug PL1 connects to the audio output or earphone jack of a scanner. The audio signal is then fed to J2, the earphone/antenna jack of the circuit. A 0.1-μF capacitor, C1, connects the center ( hot ) terminal of J2 to a BNC jack, J1. When an earphone is plugged into J2, C1 feeds RE from the earphone wire to the front end of the scanner, through J1, without directly connecting the audio circuit to the receiver. An earphone connected to J2 will therefore both provide audio and act as anantenna.



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