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Antenna Circuits:  # - F        G - S       T - Z 
 

Last Updated: October 10, 2017 02:38 PM

Circuits Designed by Dave Johnson, P.E. :
TV-VCR Light Source 40Khz Repeater -  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 David A. Johnson P.E.-June 4, 2000


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

Tape Measure 3 Element Yagi -  This antenna evolved during my search for a beam with a really great front-to-back ratio to use in hidden transmitter hunts.  This design exhibits a very clean pattern and is perfect for RDF use.  It trades a bit of forward gain in exchange for a very deep notch in the pattern toward the rear.  (You could optimize the design for more forward gain, but at the expense of a really good notch in the pattern toward the rear.) __ Contact: Joe Leggio WB2HOL

Tesla Power Receiver -  Here's something that has always bugged me: light waves are about 5000 Angstroms in wavelength, while atoms are more like 1 Angstrom across.  Atoms are thousands of times smaller than light waves, yet atoms obviously interact very strongly with light.  How can they do this? Perhaps they get around the problem by employing Quantum Mechanics (photon-physics rather than EM waves?) There must be some explanation. __ Designed by William J. Beaty

The ATL-3 Loop Antenna -  All ATL-3 loop windings are centre tapped and balanced w.  r.  t.  their amplifier/receiver chassis ground, and therefore electric field interference pick up tends to self cancel.  Magnetic noise fields, e.  g.  televisions and the electric meter box, or __ Designed by Graham Maynard

The KØLR LF Antenna Meter -  If you plan to become active on Canada's new 630m ham band, one of the first things you're probably thinking about is an antenna and how to make it resonant. Without the proper instruments, determining antenna resonance below the broadcast band can sometimes require a combination of good luck and black magic! __ Designed by VE7SLSteve

The Low-Noise Vertical -  There's been a lot of discussion lately on the Yahoo Groups ndblist regarding the "low-noise vertical" (LNV) and it's seemingly excellent performance. Originally described by Dallas Lankford as a good performer from LF to SW, ndblist member, Phil (KO6BB), recently refurbished his earlier built 'LNV', but this time with better feedline and appropriate ferrite cores for the antenna's matching transformers. Some of his description appears below. __ Designed by VE7SLSteve

The PAØRDT Active Whip On LF -  I think many hams believe that they need big antennas and lots of space to operate on 630m or even to listen on the band. I can assure you that big antennas are definitely not needed to listen or for that matter, even to transmit effectively. __ Designed by VE7SLSteve

The Scopematch On LF Part 1 -  f you're planning to get on Canada's newest ham band (630m), or are in the U.S. A. and building for when that day arrives, then you'll probably be interested in today's chatter. __ Designed by VE7SLSteve

The Scopematch On LF Part 2 -  As mentioned in Part I, my construction of the MØBMU-designed Scopematch has proven to be the most valuable piece of test gear in my LF station. If you plan to become active on our new 630m band, it is well worth taking a few hours to build as it will make antenna tuning much, much easier than trying to get your antenna tweaked using other methods. __ Designed by VE7SLSteve

The 'Shoddytenna': 160m vertical for portable use -  amateur radio construction projects. __ Designed by Peter Parker

The versatile end-fed wire -  A piece of wire of almost any length can be used as an antenna on the HF bands.  However, just because an antenna can be made to work is no guarantee that it will perform efficiently.  This article will initially concentrate on the half wavelength of wire and its useamateur radio construction projects. __ Designed by Peter Parker

Tiny Tuned Loop Antennas for the Minimum Mass Wireless Coupler -  Loop Antennas are considered to be "samall" when their diameter drops below about 1/10 of the wavelength they are intended to be used at.  In this case, I use the term "Tiny" because the antenna's diameter is about 1/30, 000 the wavelength, and at 5.5 cm __ Designed by Dick Cappels

TV/Radio Antenna Cable Galvanic Isolator -  A ground loop in your AV system caused by antenna connection or TV cable is very common if you have your computer connected to the same system.  This type of ground loop problem can be solved by using suitable isolation between your AV system and the antenna cable.  The simplest way to get rid of the hum is to disconnect the antenna cable from the AV system.  If you still want to watch cabe TV or listen to your radio an keep the system hum free then you have to install isolators to all those antenna cable connections your system has __ Designed by Tomi Engdahl

TV-VCR Light Source 40Khz Repeater -  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 David A. Johnson P.E.-June, 2000

UHF 3-element portable antenna with gamma-match -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

Unamplified Four Foot Box Loop -  I have been using a three foot box loop that Don Moman in Edmonton, Alberta put together for me for several years now.  I have been more than happy with its performance, and I have a long list of leggings to prove it, However I have been wondering how a four foot loop might help out my DX'ing by producing either a better signal or deeper nulls.  I set out to build this four foot model in every way.  My four foot loop did carry on one important idea that Don Moman's loop had and that was the less metal the better.  The four footer has as does the three footer only four screws and two bolts.  The rest of the loop is wooden thus keeping the antenna's pattern as true as possible. __ Designed by Bruce Carter

Versatile end-fed wire -  A piece of wire of almost any length can be used as an antenna on the HF bands.  However, just because an antenna can be made to work is no guarantee that it will perform efficiently.  This article will initially concentrate on the half wavelength of wire and its use in amateur radio construction projects. __ Designed by Peter Parker VK3YE

VHF Portable "rubber duck" antenna -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

VHF/UHF Dualband vertical -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

VHF/UHF wide band portable dipole for the FT-817 and portables -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

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 

Wi-Fi: 21st Century Cat's Whiskers -  The new amateur radio?wireless networking for everybody.  And we show you how to build your own antennas. __ SiliconChip

Windscreen loop aerial -  If you do not like the whip antenna on your car, you may try this alternative circuit.  A one-turn loop is installed in the windscreen of the car, keeping possibly away from the metal structure of the car.  This loop is terminated in a 6.5mm ring core suitable for VHF use

Wireless Phono Oscillator -  A "phono oscillator" is a simple, short-range AM band transmitter that was typically used to send the signal from a phonograph to a nearby radio, eliminating the need for an amplifier and speaker.  This version uses only one transistor and __ Contact: Charles Wenzel of Wenzel Associates, Inc.

XCam-Ant -  Construct a simple pre-amplified ground plane Rx antenna. This project is for folks with experience in building UHF/Microwave antennas. __ Designed by T. Black

Yagi Antenna -  To improve signal transmission or reception in specific directions, basic elements, either vertical or horizontal, can be combined to form arrays.  The most common form is the Yagi-Uda parasitic array commonly referred to as a Yagi array or beam.  It consists of a driven element which is either a simple or folded dipole and a series of parasitic elements arranged in a plane.  The elements are called parasitic because they are not directly driven by the transmitter but rather absorb energy from the radiated element and re-radiate it.


Antennas:  # - F        G - S       T - Z 

 


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