This is a simple circuit that can be used to an active antenna. This circuit is based on MOSFET to be core of operation. The MOSFET that used is MPF102. This is the figure of the active antenna.
The circuit can used to AM, FM or SW frequency. On the short wave band this circuit is comparable to a 20 to 30 foot wire antenna.
This circuit is designed to be used on receivers that use to an-tune the wire antennas, such as inexpensive units and car radios. The basic operation of this circuit is L1 can be selected for the application. A 470uH coil works on lower frequencies (AM), for short wave, try a 20uH coil. The unit can be powered by a 9 volt battery. If a power supply is used, bypass the power supply with a .04uF capacitor to prevent noise pickup. The antenna used on this circuit is a standard 18" telescoping type. Output is taken from jack J1 and run to the input on the receiver.
Source of the figure: "Popular Electronics" Magazine, Jul, 89 issue. (C)Copyright Gernsback Publications, Inc., 1989
The circuit can used to AM, FM or SW frequency. On the short wave band this circuit is comparable to a 20 to 30 foot wire antenna.
This circuit is designed to be used on receivers that use to an-tune the wire antennas, such as inexpensive units and car radios. The basic operation of this circuit is L1 can be selected for the application. A 470uH coil works on lower frequencies (AM), for short wave, try a 20uH coil. The unit can be powered by a 9 volt battery. If a power supply is used, bypass the power supply with a .04uF capacitor to prevent noise pickup. The antenna used on this circuit is a standard 18" telescoping type. Output is taken from jack J1 and run to the input on the receiver.
Source of the figure: "Popular Electronics" Magazine, Jul, 89 issue. (C)Copyright Gernsback Publications, Inc., 1989
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