circuit design

Antenna Design Lab by N4UJW Priority listing - Design and build your own Hf thru Vhf antennas.Contains pictures, plans, parts list of very popular ham antennas along with experimental types.

The optimized wideband antenna - NW3Z yagi antenna designs for Dayton 2001 Includes yagis for 20 15 10 meters.

Beverage Antennas - So you want to build a Beverage Antenna.

Double Extended Zepp Antenna  ^pop - This double extended Zepp provides 3 db gain over a dipole on the band it is designed for. Each side or leg is about 5/8 wavelength long.

The Moxon Rectangle on 2 Meters - We often think of the Moxon rectangle as strictly an HF antenna. However, its small size and special far field pattern lend themselves to some VHF applications. So let's see how to adapt the design to 2 meters (as a popular band choice) and also see a few of the uses to which we may effectively put the design.

A linear loaded vertical antenna  ^pop - Vertical antenna design by David Reid PA3HBB G0BZF

Half Bobtail Antenna - design by Brian Williams, GW0GHF

A vertically-polarised VK2ABQ Antenna - design note by Brian Williams, GW0GHF

Simple active antenna - This circuit shows an active antenna that can be used for AM, FM, and shortwave

KB1DIG's 2 Meter Antenna Design Gallery  ^pop - Home-brew antenna designs for VHF. 2-meter colinears, 2-meter Halo, and 6-meter Halo

Using Delta Matching on HF Beams - Using delta match with HF antennas design

2 Meter J-pole from 450-Ohm Ladder Line  ^pop - Great first time J-pole project. Covers most of the basics. This small and thin design also makes it good for several stealth applications.

Super Loop Antenna  ^pop - Superloop III designed by Jim, W4FTU

Limited space antennas - My site describes several compact antenna designs.

Smithe Windom Six Band HF Windom antenna  ^{updated  pop} - HF Windom antenna, cover 80, 40, 20 15, and 10 meters, antenna design by K3MT

Dipole / Inverted Vee Antenna Design - Formulas To Design Your Own Dipoles And Inverted Vees

Ham Radio India - Gateway to Indian Radio Amateurs. Resource features Indian amateur news, photos, circuits, articles, downloads, message boards and discussion forums.

bhi Ltd - Design & manufacture of Noise Eliminating speakers and modules for effective removal of unwanted noise & interference from SSB, HF, VHF, FM & UHF using new DSP technology

Quadrifilar helicoidal antenna - Design your own quadrifilar helix, the site even generates a drilling pattern in a PDF file. Several different construction methods are shown.

Online Cables.com - easily design your cable, pick connectors and cable, print drawing, get immediate quote and place order, all online.

Design and build helix antennas - An on-line javascript calculator and quite a few pictures to show how to make a helix antenna.

Ham Club Database - Designed to keep track of your club's roster

QRO via Russia - Power amplifiers from amateur radio operators around the world which are designed/built using Russian tubes.

Electronic symbols - Analog digital symbols, identification of components, units and conversi„n tables for electronics circuits design

Amateur Radio Repeater Controller - The project requirement is to design the interface to the signal channel elements after the receiver and before the transmitter