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Antenna Extension Provides Open Door Policy: 02/16/98 EDN-Design Ideas /
(Electronic Schematic / circuit added 4/02) |
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Antenna: This Antenna is most widely used all over the world. For example, when you see a police car it has a transmitter with Ground Pole
Antenna The body of car serves as ground). It accepts load from 50 ohm source and has larger power output than Half-Wave Dipole Antenna. (Schematic / circuit added 10/05) |
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Antennas: Includes longwire, loading coil, active ferrite antenna, active short antenna, vertical.
(Electronic circuit added 7/03) |
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Antennas for Ham Transmitters: Describes how to construct various type of
antenna for Ham Radio Transmitters. (Circuit added 9/04). |
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ANTENNProjects: (circuit added 7/02) |
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ATL3 Loop Antenna: (added 8/03) |
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External antenna for the GPS-38, Magellan 2000, or Eagle Explorer GPS receivers: (Electronic
circuit added 4/05) |
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General Purpose RF Amplifier: (added 1/03) |
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Long Loopstick AM Radio Antenna: Wound on a3-foot length of PVC pipe, the long Loopstick
antenna was an experiment to try to improve AM radio reception without using a long wire or ground. It works fairly well and greatly improved reception of a weak station130 miles away. A longer rod antenna will probably work better if space allows. The number of turns of
wire needed for the Loopstick can be worked out from the single layer, air core inductance formula: (Electronic Schematic / circuit added 4/02) |
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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; the input signal being tuned via L1 and the two varicap diodes at the MOSFET's input and also by L2 and the
varicaps at the MOSFET's drain terminal. Both tuned circuits provide high selectivity across the entire tuning range. To aid stability the MOSFET.... (Schematic / circuit added 10/05) |
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Pi Section Coupler: (added 1/03) |
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Q Multiplying Loop Antenna: (added 9/02) |
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QRP Antenna Tuner: (added 6/03) |
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RF Amplifier for Ferrite Bar Antennas: (added 1/03) |
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Shorty Forty Antenna: Do you have space limitation to put a 40 meter dipole. Try this Compact 40
meter antenna. . (Circuit added 9/04) |
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Small, 915-MHz antenna Beats monopole: 05/15/03 EDN Design Ideas / (added 12/04) A
915-MHz data-acquisition project required a small antenna, but the available antennas lacked the necessary characteristics: efficiency, compactness—that is, smaller than a standard 3-in. monopole—with adequate bandwidth, and with amenability to modeling by inexpensive
NEC-2 antenna software.... |
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Tesla Power Receiver: (circuit added 7/02) |
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TV / Radio Antenna Cable Galvanic Isolator: (added 8/02) |
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Unamplified Four Foot Box Loop: (added 1/03) |
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WiFi Can Antenna: Got no dough for a commercial WiFi antenna? Looking for an inexpensive way
to increase the range of your wireless network? A tin can waveguide antenna, or Cantenna, may be just the ticket. This design can be built for under $5 U.S. and reuses a food, juice, or other tin can.... (Schematic / circuit added 10/05) |
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Yagi Uda Antenna : (circuit added 7/02) |
