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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. :

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.-June 4, 2000

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.-June 4, 2000


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

General Purpose RF Amplifier -  The first article had a 3PDT switch that not only acted as a power switch, but also allowed the user to bypass the amplifier.  This would be very useful for areas with strong stations, to avoid overloading the receiver.  The second article utilized a ferrite bar antenna, which severely compromised sensitivity.  It did, however, include PCB artwork: __ Designed by Bruce Carter

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

Home-Brew Weatherproof 2.4GHz WiFi Antennas -  2.4GHz wireless networking (WiFi) is on the rise.  Here's how to make two high-performance weatherproof WiFi antennas. __ SiliconChip

Improved Active Antenna -  The first 10 mH inductor used in the prototype has about 100 ohms of resistance and that resistance is important in the source of the first J309.  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 100 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. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

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.-June, 2000

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

J-POLE for VHF/UHF -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

Long Loopstick AM Radio Antenna -  Wound on a 3 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 station 130 miles away.  A longer rod antenna will probably work better if space allows __ Designed by Bill Bowden

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

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

Magnetic loop antenna for VHF -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

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 supplied via RV2, a 10k potentiometer connected to the 12 Volt power supply __ Designed by David Sayles

MF & HF Receive Antenna Splitter -  Circuit only

My 10' x 20' Active Loop -  Some may recall my blog back in July (Wellbrook Loop Plans) describing a new loop that I had been thinking about as a possible replacement for my 10' shielded loop. I had been doodling various construction ideas using PVC tubing in an effort to keep it as light as possible, without introducing any metal near the loop. On Monday of this week, I dismantled the 10' loop in preparation for my new experimental rectangular loop. __ Designed by VE7SLSteve

ON6MU's Vipormutant portable HF/VHF/UHF antenna -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

Pedestrian Mobile HF antenna -  amateur radio construction projects. __ Designed by Peter Parker

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 antennaand the "Pi-section Coupler" __ Designed by Roy A. Walton

Position sensing of liquid metal antennas for beam scanning antenna arrays -  03/17/14EDN-Design Ideas 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 __ Circuit Design by Ahmad Gheethan-1st prize winner in the TI LDC1000 design contest 2014

Q Multiplying Loop Antenna -  Hand drawn.  This circuit is designed to be used in conjunction with the standard 4 foot square loop used in MW for long distance reception. __ Designed by Andy Collison

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. __ Designed by G. Forrest Cook

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

Quarter wave vertical antenna's for 2-Meterband, 70cm -  Ham RadioAntennas __ Designed by Guy Roels ON6MU

RDF Optimized Beam -  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

RDF2 YAGI with TAPE MEASURE ELEMENTS -  This antenna is an adaptation of the RDF2 two element, close spaced Yagi antenna described in the May, 1996 issue of 73 Amateur Radio Today Magazine.  The original design, developed by N6WZI and featured in the Homing In column of 73, used 1/4 inch solid aluminum rods for antenna elements.  If you don't subscribe to 73, find someone who does and ask to see the original article. __ Contact: Joe Leggio WB2HOL

Real Yagi AntennFor 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

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.-June, 2000

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 apartment where I am unable to erect large antennas.  For QRP operation a reasonable antenna is a necessity on the HF bands __ Designed by Harry Lythall-SM0VPO

RF Amplifier for Ferrite Bar Antennas -  The author described assembling this circuit on a 1"*1" perf board, I actually laid out a small PC board with excellent results.  In this era of surface mount components, I think a much smaller version can be laid out on a PC board, allowing this circuit to be put inside even the smallest radios, such as Walkmans.  If I do such a board, I will put the PC board artwork here. __ Designed by Bruce Carter

Ruthroff's Voltage balun using 4C6 core for HF inverted VEE 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

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

Shorty Forty Antenna -  Do you have space limitation to put a 40 meter dipole.  Try this Compact 40 meter antenna. 

Simple Antenna Preamplifier for AM Radios -  AM radios are still used for capturing transmissions from long distances (DX reception).  But AM radios normally require long (10-30m) outdoor antennae.  That is easy if you live in a village __ Electronics Projects for You

Simple Circuit Dipole Antenna -  It is very easy to create a simple 1/2 wave dipole, all you need is some lengths of wire such as the core of some mains flex or even a straightened out metal coat hanger, some co-ax cable and a connector for your scanners antenna input

Small, 915-Mhz Antenna Beats Monopole -  05/15/03  EDN-Design Ideas 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 __ Circuit Design by Dave Cuthbert and Bob Casiano, Micron Technology, Boise, ID

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


Antennas:  # - F        G - S       T - Z 


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