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

Last Updated: November 30, 2017 10:27 AM

Circuits Designed by Dave Johnson, P.E. :

40khz TV-VCR Light Source 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.  Using the device, the remote can operate a TV or VCR over three times the normal distance. . . Circuit by David A. Johnson P.E.-June 4, 2000


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

1:1 Current Balun using 4C6 core for HF antenna -  I like to use Atmel AVR Atmega PIC16 PIC16F876 PIC16F84.  Most electronics easy made for the novice and something is for the more experienced. __ Designed by Thomas Scherrer OZ2CPU

1300MHz-1500MHz antenna with Amplifier based on two MAR-8 RF Amplifiers -  Schematic only, no circuit description

137 Khz Big Coil antenna, over 1 square meter -  I like to use Atmel AVR Atmega PIC16 PIC16F876 PIC16F84.  Most electronics easy made for the novice and something is for the more experienced. __ Designed by Thomas Scherrer OZ2CPU

145 Mc 5/8-wave vertical antenna -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

15dB UHF TV Antenna Booster -  This is an UHF band TV antenna preamplifier circuit With 15dB gain to build easily.  It is formed based on BF180 UHF Transistor.  The first stage is an band pass filter constructed by the C1, CV1, L1, L4, C7 and C3, the second stage is a base-common

16 turn Helix Antenna for 70cm band (400-450 MHz) -  Ask anyone with a helix.  It really is the best and simplest antenna for the job.  Selected by the University of Surrey   (SSTL) for the UoSat ground control station, and for their many international customers; used by hundreds of satisfied radio amateurs worldwide. __ Designed by James Miller G3RUH

2.4GHz High-Power Audio-Video Link -  Forget about flea power A-V links.  This one has an output of 0.5W for a range of about 200 meters using simple "whip" antennas. __ SiliconChip

2-meter 3-element VHF Yagi antenna (144Mc...148Mc) -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

2-meter 6- or 9 element VHF Yagi antenna -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

2-Metre Elevated Groundplane Antenna -  Novel design includes a matching section to match the impedance of the feed cable.  It's easy to build too. __ SiliconChip

40khz TV-VCR Light Source 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.  Using the device, the remote can operate a TV or VCR over three times the normal distance. . . Circuit by David A. Johnson P.E.-June, 2000

5/4 Wave 2 Meter Antenna -  This month I decided to build a 2 meter 5/4 wave antenna.  This antenna is unique in that it is enclosed entirely in 3/4" PVC which makes the design a little more complicated.  The primary problem is that PVC tubing has a significant velocity factor which causes RF to slow down.  This means that an antenna encased in PVC will normally need to have it's physical length reduced by about 19%.  To further complicate the design __ Designed by Radio Amateur Society of Norwich

5/8 vertical groundplane antenna for the 6-meter "Magic Band" (50MHz) -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

50 Mc 1/2-wave vertical antenna -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

6 x 6 Loop Antenna -  This new loop antenna is his best design yet and I am proud to be the first to present his work.  It uses one, six foot square, six turn loop, and is aperiodic in nature, covering the frequency range 50KHz, 5000KHz __ Designed by Graham Maynard

630m ResourcesPart 1 -  If you're thinking about getting something going for our new 630m band, the following web resources may be of help to you.   There are a couple of 630m transmitters available on the commercial market that I know of. __ Designed by VE7SLSteve

630m ResourcesPart 2 -  Using the transverter approach offers the advantage of providing a higher-stability signal generated by the main station's transceiver oscillator system. Most of the digital modes require a higher stability than would be needed for straight CW. __ Designed by VE7SLSteve

630m ResourcesPart 3 -  robably the most-often discussed ham radio topic is that of 'antennas' and with LFers it is no different.

When it comes to antennas used for receiving,
you might be surprised to learn that even small, simple antennas, can be very effective on 630m. __ Designed by VE7SLSteve

6-meterband 3 element Yagi antenna -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

70 cms colinear -  Schematic only, no description __ Designed by Harry Lythall-SM0VPO

70 cms Slim Jim -  Schematic only, no description __ Designed by Harry Lythall-SM0VPO

70cm 10-element UHF Yagi antenna -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

70cm 4-element UHF Yagi antenna -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

70cm 6-element UHF Yagi beam -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

70cm Collinear Antenna from Coax -  Recently the RASON technical committee was hard at work at the repeater site repairing our 2 meter repeater antenna.  One of the members commented to me that I should write an article about collinear arrays so that we could all build our own.  While it is not always feasible to home-brew a commercial quality antenna designed to take hurricane force winds, it is very feasible to built a collinear antenna for average use.  This article describes a collinear antenna made from very inexpensive RG58/U coaxial cable and encased in PVC pipe __ Designed by Radio Amateur Society of Norwich

70cms Jpole -  No description given __ Designed by Harry Lythall-SM0VPO

A 2.4GHz High-Power Audio-Video Link -  Forget about flea power A-V links.  This one has an output of 0.5W for a range of about 200 meters using simple "whip" antennas. __ SiliconChip

A 2-Metre Elevated Groundplane Antenna -  Novel design includes a matching section to match the impedance of the feed cable.  It's easy to build too. __ SiliconChip

A compact L-match ATU for portable use -  No description, schematic only __ Designed by Peter Parker VK3YE

A double quad directional Antenna for 1296 MHz -  Mechanical and electrical data and a picture. __  Designed by Herbert Dingfelder

A Dual Band VHF/UHF J Pole -  This antenna provides continuous coverage of the 2 metre   (144 – 148MHz) and 70cm   (430 – 450MHz) bands and is an excellent choice for base station use.  The design is based on an article which originally appeared in CQ magazine   (1987), and a version of this design is produced by Arrow Antennas of the USA   (not available in Australia).  In Adelaide, Barry   (VK5ZBQ) and Paul   (VK5PH) produced a kit version of this design for members of the Adelaide Hills Amateur Radio Society, __ Designed by VK5JST / VK5TR

A magnetic loop antenna for 160 to 15m -  amateur radio construction projects. __ Designed by Peter Parker

A magnetic loop antenna for 40 to 17m local & DX contacts from tight spaces -  amateur radio construction projects. __ Designed by Peter Parker

A QRP DX antenna -  amateur radio construction projects. __ Designed by Peter Parker

A Real Yagi Antenna for UHF CB -  Are you good at scrounging? All it takes is some plastic conduit and a couple of wire coat hangers to build this really effective antenna __ SiliconChip

A Shielded Loop Antenna for DX AM Reception -  Dramatically improve your AM reception with this tuned loop antenna.  It's just the shot for remote areas & for minimising interference. __ SiliconChip

A Simple Circuit HF antenna matcher in PI configuration -  Just a picture, but should be enough to build one yourself. __ Designed by Herbert Dingfelder

A Simple Circuit loop antenna crystal radio -  I love crystal radios and since I could back to my bench a couple of years ago I’ve the opportunity to make some of that.  There something fay behind its elegant simplicity… pick radio waves with only few simple components and use the energy of the radio stations to produce directly the sound you’re hearing is something wonderful to me.  From very simple sets made from the junk box to high performance crystal radios all of them have its appeal. __ Designed by Marcos Kusnick

A Versatile 630m Antenna -  Mark, VA7MM, had come up with a nicely-designed antenna that will serve as his main 630m radiator. Not only that but it can be used on 10m, 15m and 30m and 160m as well! __ Designed by VE7SLSteve

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Antennas:  # - F        G - S       T - Z 


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