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Antenna Circuits
Antenna Circuits:  #'s - A        B - R        S - Z
Last Updated on: Thursday, June 25, 2015 06:20 AM

 
Circuits Designed by Dave Johnson, P.E. :
  • Remote Extender Circuit  -  This circuit is designed to be placed directly in front of a standard TV or VCR remote. The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful. Using the device, the remote can operate a TV or VCR over three times the normal distance . . . [Circuit by Dave Johnson P.E.,  06/04/00]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Build a hanging dipole for two metres -  Ideal for the portable operator.amateur radio construction projects.… [from Peter Parker's website]

 

Build a simple crystal set -  amateur radio construction projects.… [from Peter Parker's website]

 

Compact L-match ATU for portable use -  amateur radio construction projects.… [from Peter Parker's website]

 

Dipole Antenna -  A simple dipole antenna can be used for improved FM broadcast signals. A dipole is basically a length of conductor (wire) split into two portions and signal is taken off at the split. It has a nominal 3 dB gain over an isotropic source and is directional, tending…

 E-field Circuits -  If you place the amplifier at the antenna, you avoid all that cable capacitance but your amplifier must have a correspondingly higher input impedance to maintain flat gain at the lower frequencies. For a typical 10 pF antenna (about a meter long) you would want a 100 megohm input impedance to have flat gain down to 150 Hz! One simple solution is to add some shunt capacitance across the antenna, eating … [Charles Wenzel (unless otherwise noted)]

 

Ground Pole 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.…

 

Half-Wave Dipole Antenna (Open Dipole) -  It accepts load from 75 ohm source and has much smaller power output than Ground Pole Antenna. Use this antenna only when you don't have GP Antenna. Construction: Two aluminum rods ,each of length "L" in meters are joined together through an insulator as shown in fig. From center, 75 ohm cable is feeded just like ordinary TV antenna…

 

Improved Active Antenna -  The 10 mH inductors used in the prototype have about 100 ohms of resistance and that resistance is important in the source of the first J310. If you inductors are significantly lower in resistance, add a series resistor to total around 100 ohms. The other two chokes in the power supply should be below about 150 ohms, but lower resistance is fine. Lower value chokes can be used, but at some point, the low frequency response will suffer. For 100kHz and above, 1 mH is good. Also make sure that the lower value choke exhibits 100 ohms of resistance in the source of the JFET by adding series resistance.… [Charles Wenzel (unless otherwise noted)]

 

Infrared Remote Extender Circuit -  This circuit is designed to be placed directly in front of a standard TV or VCR remote. The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/04/00]

 

J-Pole Antenna -  Tuned for 89MHz in the FM broadcast band…

 

Long Loopstick AM Radio Antenna -  … [Bill Bowden, designer]

 

Magnetic loop antenna for 160 to 15m -  amateur radio construction projects.… [from Peter Parker's website]

 

Medium Wave 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 is supplieb via RV2, a 10k potentiometer connected to the 12 Volt power supply… [Circuit : David Sayles]

 

Pedestrian mobile HF antenna -  amateur radio construction projects.… [from Peter Parker's website]

 

Pi Section Coupler -  Inexpensive gadget tunes antenna for better DX.Almost any receiver covering 540 kHz to 1600 kHz is suitable for broadcast band DX'ing, and there are a lot of them. But the antenna is another matter. If you are new to the hobby, or if you have been having trouble DX'ing those really difficult stations, you may find the answer to your reception problems in a properly constructed long-wire antenna - and the "Pi-section Coupler"… [by Roy A. Walton]

 

Position sensing of liquid metal antennas for beam scanning antenna arrays -  03/17/14 - EDN Design Idea   High gain beam scanning arrays are usually implemented using phased antenna arrays or mechanically controlled parabolic dishes. However, the aforementioned technologies are widely known as costly ones. Recently, a new design of beam scanning arrays has been introduced using the liquid metal technology. Specifically, the antenna is made of a liquid metal volume that is encapsulated in channels and moved mechanically using a single mechanical pump… [by Ahmad Gheethan-1st prize winner in the TI LDC1000 design contest 2014]

 

Q Multiplying Loop Antenna -  … [Andy Collison's website]

 

QRP Antenna Tuner -  This circuit is for a QRP (low power) antenna tuner, a.k.a. a transmatch, for use in the short wave amateur radio bands from 3-30 Mhz. It allows a wide variety of antennas to be connected to a low power transmitter. When the circuit is properly tuned, the maximum transmitter power will be delivered to the antenna. It is used in conjunction with a standing wave ratio (SWR) meter.This is a fairly generic antenna tuner circuit.… [design by G. Forrest Cook]

 

QRP DX antenna -  amateur radio construction projects.… [from Peter Parker's website]

 

Remote Extender Circuit -  This circuit is designed to be placed directly in front of a standard TV or VCR remote. The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful. Using the device, the remote can operate a TV or VCR over three times the normal distance . . . [Circuit by Dave Johnson P.E.,  06/04/00]

 

Restricted space antenna -  "QRP" operation often means operating in remote places where a decent full-sized antenna is not possible.   I personally live in an appartment where I am unable to erect large antennas.   For QRP operation a reasonable antenna is a necessity on the HF bands… [Harry, SM0VPO Email: harold.lythall @ era.ericsson.se]

 

RF Amplifier for Ferrite Bar Antennas -  …  


Antenna Circuits:  #'s - A        B - R        S - Z


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