circuit design

HF Aerial Design - A novel approach to aerial evaluation with diagrams and graphs by G3CWI

J-Pole antenna design  ^pop - Complete guide to build Jpole antennas with online dimensions calculator.

A Hanging Rectangular Loop Antenna - A rotatable hanging loop antenna that has been specifically designed for hanging in a tree. Horizontally polarized with a broad azimuth pattern and gain of nearly 3dB over a simple horizontal dipole!

Cubical Quad Antenna Design  ^pop - By N6VNG, can be used to determine the element lengths and the gamma match values for different frequencies, includes link to excel files with formulas to dimension your quad antenna.

Antenna switch for sloper antennas - An easy to build antenna switch for long wire antennas, expecially designed for sloper antennas

1270Mhz Yagi Antenna - Build your own antenna for the 23cm band ( 1250Mhz - 1280Mc ) using some aluminium and this simple design.

Broadcast microwave services - Designs and manufactures a comprehensive line of microwave communications equipment for television broadcast, video, telemetry, and electronic surveillance applications.

Radio Adventures - Design and manufacturing of electronic components, kits, and accessories for the amateur and commercial communications. CMOS Keyers, W1AW receivers, PC borads kits

Nally radio towers - Radio towers with designs made specificaly for Amateur Radio operators, incorporating mounting plates for most common rotators with in tower structure allowing for safety in the use,and tilt over preventing the need for climbing towers during regular maintance

QTH.COM Priority listing - QTH.COM by KA9FOX offer classified swap ads for amateur radio and web design along to evoluted web hosting

PolarPlot - Freeware antenna software that lets you see what the polar diagram of your rotatable beam actually looks like where it is operating. With PolarPlot you can measure the polar diagram of the antenna and check for abnormalities - compare plots taken before and after changes to the design or location - check the -3dB beamwidth - look at the front to back ratio - see the size and position of the sidelobes.

Yagi Designer  ^pop - Program that produces antenna radiation patterns and graphs for SWR, forward gain, and F/B ratios

ASAP - A Free general purpose antenna analysis user-oriented software program for numerical electromagnetic antenna design, antenna modeling and antenna analysis.

Spectran - Program designed to do spectral analysis and real-time audio filtering on reception of audio signals for EME, VLF, SETI applications. Offer support for MTHELL, QRSS, DFCW, NDB, WSJT by I2PHD

Int. Morse Code program information - This program is designed to help the beginner learn to receive and send the International Morse Code.

TTYlink - TTYLink is a freeware client chat telnet application designed for packet radio and available for Windows NT 4.0 and Windows 95/98.

Satsoft - Satellite antenna design and systems engineering software for windows

Zelscope  ^pop - Zelscope is a Windows software that converts your PC into a dual-trace storage oscilloscope and spectrum analyzer. It uses your computer's sound card as analog-to-digital converter, presenting a real-time waveform or spectrum of the signal - which can be music, speech, or output from an electronic circuit.

Amplifier Simulation Program - ASP 4.0 - Design weak signal GaAs FET or bipolar PreAmps. Automatically designs for optimum gain, NF, VSWR or all.

KM5KG network designer - Windows98 Program for RF Design

PLL2 - 2nd Order phase locked loop design for passive and active circuits. Bode plot, step response, design parameters

AAVoice digital voice processor Priority listing - "Digital voice processor for amateur radio operators. It use prepared ""wav""-files for transmition. Can work in the beacon mode. Optionally you can use simple circuit for PTT-control. It has a lot macros for tramsmitting. Can cooperate with RZ4AG AALog logger."

KI5YN QLF Filter - The QLF filter is a microprocessor based interface designed to go between a standard Morse code key and a radio transmitter

RS232 Interface - This simple circuit is intended for older Kenwood radios and was presented in chapter 22 of the ARRL Handbook.

Toroid Pro - Designed by microwave engineers to provide filter, radio,microwave and Ham radio engineers with all relevant information of an inductor and core at his or her finger tips