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5 Watt FM Transmitter with Antenna (88-108 MHz): (added 606) |
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6x6 Antenna Loop: (added 8/03) |
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Active Antenna: (Circuit
added 9/04) |
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Active Antenna for AM-FM-SW: (Circuit added
9/04) |
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Active Antenna for HF-VHF-UHF: (Circuit added
9/04) |
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AM / FM / Sw Active Antenna:
This circuit shows an active antenna that can be used for AM, FM, and shortwave SW. On the 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 the application (Electronic Schematic / circuit added 4/02) |
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AM Loop Antennas: (added 1/03) |
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AM/FM/SW Active Antenna:
This circuit shows an active antenna that can be used for AM, FM, and shortwave SW. On the 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 the application (Circuit added 9/04) |
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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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Frequency-selective gain increases dynamic
range of an active antenna: 12/14/98 Electronic Design - Ideas for Design / (Electronic circuit design added 02/05) This much-improved version of the “High-Gain Broadband
Active Antenna” (Electronic Design, Jan. 6, 1997, p. 164) features wider bandwidth and lower noise at half the power consumption and a fraction of the cost (the IC complement here costs. . . |
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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) |
