circuit design

A portable 10/20/40 mt vertical antenna  ^pop - A portable vertical antenna for 10 to 40 meters, designed for mobile operations can be used in a car as seen in pictures. A modified version for 20 and 40 meters is described too.

A Wire Beam Design for 80 meters - by Dave Robbins, KY1H

Axial-Mode Helical Antenna Calculator - Simple implementation of the ARRL Antenna Book design equations for the axial-mode helical antenna.

Quadrifilar helicoidal calculator - Calculate design for a quadrifilar helicoidal antenna

Delta loop antenna on on 26-30 MHz - Design your own delta loop antenna according to you characteristics.

An Improved Multiband Trap Dipole Antenna - This improved multiband trap dipole introduces a new trap design and a change in trap location. The antenna features double-coaxial-cable-wound traps having lower reactance and a higher quality factor (Q) than earlier coax-cable traps by W8NX

Balanced Self Matching Feed Line System - KE4UYP designed this Balanced Self Matching Feed Line System for people who want the very best feed line they can have on a Monobanded antenna

10m Halo antenna project - This aerial is designed to fit into a small attic, loft or roof space, or even into the garden shed by Roger Powell G0AOZ

WARC 24 18 - 3 element Yagi Antenna - An old project by I1VCF for a 3 element yagi antenna originally designed for 10/15/20 and extended to 24 and 18 Mhz in Italian

CobWeb antenna construction - A 5 band omni directional antenna original design by g3tpw. Works on 10,12,15,17,20,2,6 m & 70cms.

Musings on the Miracle Whip design - A modified design of this popular portable antenna The whip described here will tune up to a respectable SWR on 40 metres and up.

ZL1BPU Rotator Controller - A very simple controller circuit, with fairly smart performance! The ZL1BPU Rotator Controller has been designed as an add-on unit for the popular Kenpro KR-400 and Yaesu G-400 rotators. The controller consists of a small circuit board which fits inside the rotator control box (see picture).

Cumbria Designs - Quality electronic kits, transceiver display, Minicounters, VFO Stabiliser, Microcode Morse Reader

Connect Quick - A unique new mounting system for lightning fast connection of boom to mast.

The ElectraSlide Antenna - Modification of the DK3 design by Don Johnson, W6AAQ. No voltage dropping, operates on the full 12 volts. The control switch and the matching toroid are supplied. All you need is a standard 3/8 by 24 thread ballmount, 2 wire sheilded microphone cable for control wiring, and a CB whip cut to resonance.

K6XX CW Indicator Kit - The purpose of this circuit is to light a LED in your radio when you tune to within +- 20hz of a cw signal. This makes for easy tuning of a cw signal by eye rather than by ear

Wire Free Direct LtD - UK company that's a full-line dealer for wind and solar power systems, plus system design.

Shortwave Converter - This is a simple circuit that when placed near an ordinary AM broadcast radio will allow you to receive international shortwave broadcasts in the 5-6 MHz band

DL6WU Long boom Yagi design tools - This is an Excel spreadsheet template to design DL6WU Yagi antennas

LP-Rotor - LP-Rotor 2.0 is a standalone freeware rotator control program for use with Microsoft Windows. LP-Rotor should work with all versions of Windows from Windows 95 forward. It is designed to be used with the Hy-Gain DCU-1 or RotorEZ interfaces for Hy-Gain rotators, or the RotorCard interface for Yaesu rotators.

Target 3001 PCB Design - Represents a new generation of CAD/CAE software for circuit design. Has been created to meet the requirements of professional design engineers.

NU-Tech - NU-Tech is a powerful DSP platform to validate and real-time debug complex algorithms, simply relying on a common PC. Thanks to an easy plug-in architecture, the developer can write his own NUTSs (NU-Tech Satellites) in C++ and immediately plug them into the graphical interface design environment.

Panel Pool - Front Panel designer by panel pool

The KB6IBB Utilities - Ham radio frequency list consolidation software. The Ham Radio database can house a unlimited number of records. Holding frequency information from DC to Daylight. The Radio Scanner Database is designed to emulate a radio scanner. A 5,000 record table is provided and is organized by channel number.

Ham Club Membership - Ham club membership management software, designed to assist either the secretary, membership chairman, or any one else in a ham radio club to maintain accurate records about it's membership, vital documentation, or club assets by Alpine Software