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Antenna Circuits
Antenna Circuits:  #'s - A        B - R        S - Z
Last Updated on: Thursday, April 07, 2016 01:00 PM

 
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.,  06/04/00]

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

1:1 Ruthroff's Voltage balun using 4C6 core for HF inverted VEE antenna  -  My Radio amateur callsign is OZ2CPU.  I like to use Atmel AVR Atmega PIC16 PIC16F876 PIC16F84.  Most electronics easy made for the novice and something is for the more experienced.… [oz2cpu at gmail dot com]

1:1 Current Balun using 4C6 core for HF antenna. -  My Radio amateur callsign is OZ2CPU.  I like to use Atmel AVR Atmega PIC16 PIC16F876 PIC16F84.  Most electronics easy made for the novice and something is for the more experienced.… [oz2cpu at gmail dot com]

 

1300MHz-1500MHz antenna with Amplifier based on two MAR-8 RF Amplifiers -  Schematic only, no circuit description… [designer not identified]

137 Khz Big Coil antenna, over 1 square meter -  My Radio amateur callsign is OZ2CPU.  I like to use Atmel AVR Atmega PIC16 PIC16F876 PIC16F84.  Most electronics easy made for the novice and something is for the more experienced.… [oz2cpu at gmail dot com]

 

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…

 

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.,  06/04/00]

 

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… [Radio Amateur Society of Norwich]

 

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… [Design by Graham Maynard]

 

70 cms colinear -  Schematic only, no description… [Harry, SM0VPO Email: harold.lythall @ era.ericsson.se]

 

70 cms Slim Jim -  Schematic only, no description… [Harry, SM0VPO Email: harold.lythall @ era.ericsson.se]

 

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… [Radio Amateur Society of Norwich]

 

70cms Jpole -  No description given… [Harry, SM0VPO Email: harold.lythall @ era.ericsson.se]

 

A compact L-match ATU for portable use -  No description, schematic only… [from Peter Parker's website]

 

A double quad directional Antenna for 1296 MHz -  Mechanical and electrical data and a picture.… [Herbert Dingfelder's web site]

 

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

 

A magnetic loop antenna for 40 to 17m local & DX contacts from tight spaces -  amateur radio construction projects.… [from Peter Parker's website]

 

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

 

A simple HF antenna matcher in PI configuration -  Just a picture, but should be enough to build one yourself.… [Herbert Dingfelder's web site]

 

Active Antenna -  An antenna with an integrated RF pre, Amplifier. …

 

Active Antenna AA-7 HF/VHF/UHF, 3-3000MHz -  If you have a shortwave or high-frequency receiver or scanner that is struggling to capture signals with a short, whip antenna, and you'd like the kind of performance that a 60-foot 'longwire' antenna can provide but lack the space to put one up, consider building the AA-7 HF/VHF/UHF Active Antenna described in this article.… [by Fred Blechman]

 

Active Antenna for AM-FM-SW -  This simple little circuit can be used for AM, FM, and Shortwave (SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna.  It is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios… [Tony van Roon's circuit]

 

Active Antenna, easy to build -  When fate or nasty neighbors prevent you from stringing a long-wire receiving antenna, you'll find that this pocket-size antenna will give the same, or even better, reception. This "Active Antenna" is cheap to build" and has a range of 1 to 30Mhz at between 14 and 20dB gain… [Tony van Roon's circuit]

 

Aerial Tuning Unit -  A simple passive (no power required) circuit to match an antenna to a radio receiver.This will be a useful addition to the short wave listener, but in addition a medium wave coil is almost used to tune the medium wave band.… [Circuit by Andy Collison]

 

AM Broadcast Loop Antenna -  A loop antenna can greatly improve medium wave reception. Loop antennas
are directional and receive signals along the plane of the windings. The directional quality improves signal to noise ratio of the desired signal while rejecting signals perpendular to the plane of the windings. Larger loops are better than smaller ones but good results can be obtained from moderate sizes of one or two feet on a side… [Bill Bowden, designer]

 

An active Receiving Antenna for 0.5-30 MHz -  A close-up picture of the BF254 source follower.… [Herbert Dingfelder's web site]

 

An automatically tuned HF mobile antenna -  This elegant design covers the complete spectrum from 7 to 30 MHz at less than 1.3:1 SWR, is compact, very weatherproof, robust and has good performance.This article was first published in the QEX / Communication Quarterly magazine. The article comes in five pages, with lots of photos, mechanical drawings, schematic diagram, PCB layout and software listing. Exact duplication is not for the faint of heart, but some of you may find individual parts and ideas useful for your own projects!… [Manfred Mornhinweg]

 

Antenna 1/4 wave for 940 to 980MHz easy homemade  -  My Radio amateur callsign is OZ2CPU.  I like to use Atmel AVR Atmega PIC16 PIC16F876 PIC16F84.  Most electronics easy made for the novice and something is for the more experienced.… [oz2cpu at gmail dot com]

 

Antenna height measurement made easy  -  My Radio amateur callsign is OZ2CPU.  I like to use Atmel AVR Atmega PIC16 PIC16F876 PIC16F84.  Most electronics easy made for the novice and something is for the more experienced.… [oz2cpu at gmail dot com]

 

Antenna Tuning Unit -  A simple passive (no power required) circuit to match an antenna to a radio receiver.This will be a useful addition to the short wave listener, but in addition a medium wave coil is almost used to tune the medium wave band.… [Andy Collison's website]

 

Antennas for Ham Transmitters -  Describes how to construct various type of antenna for Ham Radio Transmitters.… [Circuit Designer's name is not listed]

 

Antennas for Low Power Applications -  There seems to be little information on compact antenna design for the low power wireless field. Good antenna design is required to realize good range performance. A good antenna requires it to be the right
type for the application. It also must be matched and tuned to the transmitter and receiver. To get the best results, a designer should have an idea about how the antenna works, and what the important design
considerations are. This paper should help to achieve effective antenna design.… [by Kent Smith]

 

Antennas for the space-restricted -  amateur radio construction projects.… [from Peter Parker's website]

 

Antennas-includes longwire, loading coil, active ferrite antenna, active short antenna, vertical. -  Home-made antennas can greatly improve the performance of AM and FM radios, short-wave receivers, and scanners. If you are a talk-radio fan then experiment with the AM band antennas and you will be able to hear shows from all over the country with surprising clarity. Short-wave receivers are always coping with weak signals and they must have a good antenna to perform adequately. Scanners can pick up local police and two-way radio with the little telescoping antenna provided but with good antennas a scanner becomes an amazing ear on the world nearby. No pre-amp, filter or other receiver refinement offers anywhere near the level of performance improvement t that a well-designed antenna offers. The results can be quite satisfying, leaving no doubt that the project was well worth the effort… [Copyright © 1998 Wenzel Associates, Inc.]

 

ATL3 Loop Antenna (Graham Maynard) -  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… [Andy Collison's website]

 

Automatic Antenna Motor Lift system -  My Radio amateur callsign is OZ2CPU.  I like to use Atmel AVR Atmega PIC16 PIC16F876 PIC16F84.  Most electronics easy made for the novice and something is for the more experienced.… [oz2cpu at gmail dot com]

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


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