circuit design

ZR6KMD 2M Beam Antenna - This design was adapted from an article in the ARRL Handbook and built with simplicity and duplicity in mind. This antenna is a vast improvement over a standard dipole with a forward gain of around 8db with a front to back ratio of 10db.

40-80 Dipole antenna - A 40 80 dipole antenna design by WA6ESC PDF File

80m Loop EZNEC Analysis - Antenna data, and design note for this horizontal loop antenna resonating on 80 Meters by K0ZE

Hentenna for 10 meters - Designing an Hentenna antenna for 10 meters band

Antennas for MF and LF - Long Waves, Short Antennas, designing antennas for MF and LF communications

Building Coaxial Traps - This page describes the design and construction materials W8WWV used to build a coaxial cable trap. A coaxial cable trap is a parallel resonant circuit that is usually inserted in an antenna element to enable multiband operation.

Multi Band Antenna Traps - These devices are called Traps, but they are actually more like frequency sensitive switches. They are parallel resonant, high Q, tuned circuits which provide a very high impedance at their frequency of resonance.

Flat plate aerial for 23 cm - This is a simplified design for /P aerials yet offers about a +12dBd gain on 23 cm

The ZS6BKW Multiband HF Antenna - Antenna design from ZS6BKW (G0GSF), similar to the G5RV, but it actually resonates on five bands It’s only 90 ft long 27.51 m, with a 40 ft 12.2 m downlead

Canadian Antique Radios Schematics Diagrams Service - We specialize in canadian antique radio schematics for vintage tube radios made in canada. we carry lots of factory electronic circuit schematic diagrams as well as all rcc / radio college of canada service data 1920's - 70's.

SCR-Log - Scr-log freeware logging program for mac, windows, linux and dos. designed for school, club, and individual class stations to use during school club roundup.

VE - Canada - PEI DX LODGE - Prince Edward Island. The PEI DX Lodge offers a turnkey operation from a custom designed shack featuring state of the art transceivers/amplifiers, etc. and the ultimate in antennas on every band.

Ginlong Technologies - World leading specialist in manufacturing, providing design services for small scale wind turbine systems and parts (<30kW)

Television History - The First 75 Years, learn about the history of TV-set design, development and marketing.

Icom 706 Major Defect Found - WA6CDE write about a major problem, a design flaw on two Icom 706 caps that have corrosive liquid that can seriously damage this icom transceiver.

Linrad - Multiplatoform freeware DSP software. Linrad has its origin in software that was developed for 144 MHz EME CW but it is quite general and should be seen more like a kit for designing a receiver that a receiver for some particular usage. It can be used as a CW receiver with a small time delay and a fast waterfall graph. A dsp for conventional receiver to imporve signals readability, a spectrum analyzer.

AM-6154 FAA Amplifier circuit conversion - AM-6154 222MHz grid Conversion Information by N0UK

Homebrew HF Amp with 3CX3000F7 - Grounded grid triode HF linear amplifier with pictures and schematics diagrams by W2DTC. The amp design was for 160 80 40 and 20 meters

Rotator Brake Delay and Protection Circuit - A rotator modification by W4ZT

An Intelligent keyer for FSK beacon usage - Designing a beacon keyer that transmit the relative output power along to call sign.

T-Pad / H-Pad Resistance Calculator - This calculator is designed to give resistor values for unbalanced T-pads, and for balanced H-pads.

Online Calculators for Radio & Electronic Design - Online calculators for toroid coil, air-core coil inductance, XL, XC, and more.

Diplexer design notes - Standard diplexer design is based on singly-terminated Butterworth filters.

YCCC 6 Band Receive Bandpass filter - This is a 6 band receive only filter designed to protect your receiver front end and provide 45dB reject at the stop bands.

A Power Supply on the Cheap - Need a variable power supply that is short circuit protected and over voltage protected; Here is a good one that can be built cheap by VE3IVJ