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Active Antennas
Last Updated on: Friday, April 25, 2008 04:12 PM
 
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
A magnetic loop antenna for 160 to 15m:  (design added 6/07)
A magnetic loop antenna for 40 to 17m local and DX contacts from tight spaces:  (design added 6/07)
A magnetic loop antenna for 80 and 40m an antenna for anywhere, even indoors!:  (design added 6/07)
A QRP DX antenna pier + squid pole + wire = QRP DX:  (design added 6/07)
Active Antenna for AM-FM-SW:  (circuit added 9/04)
Active Antenna for HF-VHF-UHF:  (circuit added 9/04)
Active Antenna with Gain:  An antenna with an integrated RF (electronic circuit added 6/02)
AM/FM/SW Active Antenna:  This circuit shows an active antenna that can be used for AM, FM, and shortwave SW. On  shortwave band this active antenna is comparable to a20 to30 foot wire antenna. This circuit uses receivers that use untuned wire antennas, such as inexpensive units and car radios. L1 can be selected for  application (added 4/02)
An end-fed antenna:  L-match coupler and resistive bridge for HF one wire, all bands  (design added 6/07)
Antennas:  Ground Pole and Half-Wave Dipole Antennas (circuit added 10/06)
Magnetic loop antenna for 160 to 15m:  (design added 6/07)
Magnetic loop antenna for 40 to 17m local and DX contacts from tight spaces:  (design added 6/07)
MW Active Antenna:  This circuit is designed to amplify the input from a telescopic whip antenna. The preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz. The tuning voltage required is 1 to 12 volts and can be obtained from a 10k potentiometer connected to the 12 Volt power supply. RV1 is the gain control allowing weak signals to be amplified or strong signals to be attenuated. The control voltage is applied to gate 2 of TR1, a dual-gate MOSFET, the signal voltage applied via gate 1; ....    (added 10/05)
OA-26: OA-26 Designing Active High Speed Filters:  National Semiconductor Application Note   (app note added 3/06)
Q-Multiplying Loop Antenna:  (electronic design added 6/07)
QRP Antenna Tuner:  (electronic design added 6/07)
QRP Antenna Tuner:  (electronic design added 6/07)
QRP DX antenna pier :  (design added 6/07)
The ATL-3 Loop Antenna:  (electronic design added 6/07)
TV/Radio Antenna Cable galvanic isolator:  (design added 8/03)

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