circuit design

Design & Performance of a Choke Balun - Design & Performance of a Choke Balun and Balanced Transmission Line by G4FGQ

4:1 coax balun design - Online calculator for a 4 to 1 coax cable balun

Guanella 4:1 balun - This article reviews the proposition that a 4:1 current balun in the style of Guanella can be constructed with both pairs of windings sharing a common magnetic circuit.

Folded dipole antenna by N4SPP - A quarter size cobra dipole antenna, a multiband dipole antenna for 40 to 10 meters basedn on original cobra dipole design but with a limited space by N4SPP

ForkTenna - The Forktenna is a very unique design. It is essentially a half sized Hentenna.

Designing Log Periodic Antennas - Lightweight and precise, the log periodic has become a favorite among EMC engineers By Glen Dash, Ampyx LLC

NVIS antenna design - Theory, Modeling, and Practical Applications By W5JCK, presentation in PDF File

Direct Fed VHF Yagi antennas - W5TX direct fed VHF Yagi antenna designs

W4AP - Montgomery Amateur Radio Club - The Montgomery Amateur Radio Club is an active organization that has earned the Special Services Club designation from the ARRL.

VU2UKR HAM Radio Station - HAM Radio India Yagi Beam CW QRP SSB QUAD DX circuits sound card Transceiver Morse HF VHF Antenna Satellites Amateur Club Station Operators Licence Exam ASOC Guide Digital Mode Equipment Transmitter Experiments Project schematics Beacon dx HAMSAT VUSAT Satellite Emergency communication Information Homebrew QRP Kits

CWS Coil Winding Specialist - Manufacturer of transformers, inductors coils and chokes. Custom winding, EMI / RFI Filters, Antenna Windings on ferrite rod, Antenna Winding on phenolic. Any antenna coil designs.

Megawave - MegaWave Corporation's goal is to provide services and products of the highest quality to its many customers in the areas of antenna design and development, and radiowave propagation.

Communication Coil - Communication Coil, Inc. designs and produces custom, high reliability Filter Networks, RF Coils, Chokes, Inductors, Baluns, Toroids and Power Magnetics for communications

Advanced Linear Devices - Electronic compoenents manufacturer of precision CMOS analog integrated circuits for OEMs of industrial controls, computers, instrumentation, automotive, and telecom. Transistor mosfet.

Radio Antenna Design - Covered all kind of antenna desings for all bands and radio applications.

Cantenna Calculator  ^updated - A circular waveguide calculator for designing cantennas include source code and windows executable by lincomatic

IC-Prog Prototype Programmer - PIC Programmer software package that allows you to program all types of serial programmable Integrated Circuits using Windows 95/98/NT/2000/ME/XP

Windipoles - Windipoles is a free passive filter simulator. It is a Windows .NET executable, so no software installation is required. It enables design, analysis, optimizations and plots, all graphically.

TK5 for IC-R5 - Open source software designed for the ICOM IC-R5 receiver. Linux, MacOS X and Windows

pythonProp - pythonProp is a collection of Python scripts designed to plot files produced by VOACAP. The package currently contains two scripts, both of which make use of the matplotlib library

Increasing Amplifier Relay Speed - Article describes a circuit that accelerates the coil of DC relays by momentarily doubling their voltage.

VersaBeacon Project - The VersaBeacon is a frequency agile, modulation agile RF source using a DDS chip and minimal support circuitry. It covers a frequency span of 1MHz to 150MHz in 1 Hz steps and provides a variety of modulations

Frequency Counter project  ^updated - Circuit and construction instruction designed by Mani VU2ITI

QRP AM CW transmitter - A simple low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator

CAT programming interface for ICOM rigs - This simple and cost effective interface circuit is designed for use with any ICOM amateur radio equipment with CIV interface