The AA8V Twinplex Regenerative Receiver
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After building several simpler receivers, I wanted to try my
hand at a more complicated, multi-band, multi-stage, receiver.
Someday I wanted to build a superhet, but I thought I should try
building a really good regenerative receiver first. [Designer:
Greg Latta, AA8V]
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
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
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. |