ameritron als 500

A 5 elements Vee log-yagi for 10m - 5 elements "vee" log-yagi for 10m band- boom lenght : 4mt. Gain : over 10 dBd , f/b =over 40 db (deep null) f/b= min 20dB for different polarization signals

80m L Antenna. RSBEV's - Reduced Size Broad Elevation Verticals

80/75 Meter 4-Square Array - This array has been in use since 1989. The SWR from 3.5 to 3.9 is below 1.5:1. The F/R of the array is 20dB average and with some signals even better.

KC1XX Contest Station - Amateur Radio Station owned by Matt Strelow. The station is designed for competition in the multi-operator multi-transmitter category of high-frequency DX contests. Running with 7 towers 6 rotators, 8 beverage listening antennas, and 4 spotting verticals

K0KP 10 Meter QRPp Beacon - Homebrew K0KP 500 Milliwatt Ten Meter Beacon. The beacon is located at the K0KP shack in Fredenberg, Minnesota, USA at Maidenhead grid square EN36VW

RTTY contesting.com - Rtty contesting using writelog for windows. RTTY records and rules, tutorials

Bromley Repeater Group - Gateway - Website and Forums of The Bromley Repeater Group which has been formed to launch and maintain the new Kent repeater, GB3OK. Located in Orpington and with an ASL of 600 feet, it's predicted to provide coverage over a large area of London and South East England. Also on Echolink node 280040

ABC Dx Fundamentals of the Art of DXing - Fundamentals of the Art of DXing, an interactive tutorial, contains animated graphics & audio by Don Boudreau, W5FKX

Report of Solar and Geophysical Activity - The Report and Forecast of Solar and Geophysical Activity is the primary daily report prepared by SEC. It provides a summary and analysis of solar and geomagnetic activity during the previous 24 hours as well as the most recent solar indices. It also provides a forecast of activity and indices for the next 3 days.

SB-220 SB-221 Heathkit Amplifiers - SB-220 or SB-221 Heathkit Amp Using Eimac's 3-500Z - K0GKD

Yaesu FT-2000 Mods and Manuals  ^updated - Mods and manuals for the FT-2000

Yaesu VR-5000 control software - F1MDT freeware remote control for yaesu VR-5000 in french

Kristalscanner.nl - A large collection of crystal controlled scanners

NEC4WIN - NEC4WIN is a 32 bits commercial antenna simulation software based on MININEC3 developed by the Naval Ocean Systems Center in the 70s and 80s. It runs under Windows and can be used to simulate, analyze and optimize wire antennas, beams, verticals, etc. NEC4WIN has limitations. They are the same as Mininec3 on which the engine is based.

Javascript antenna calculations - Javascript online calculators for dipole 5/8 verticals with radials, and delta loop antennas

N1IBC Eimac 4CX1500B HF Power Amplifier - 1500 Watt HF power amplifier

G3YXM 500 W solid state amplifier - HF 500 Watt power amplifier schematics by G3YXM

4CX1500 - This is a 4CX1500B grid driven amplifier that is built like a tank. The unit is considerably over designed as can be seen in the pictures documenting the construction

ON7WJ Amplifier 500 watt

500 WATT PA by SM0VPO  ^pop - 500W Power Amplifier by Harry Lythall - SM0VPO

Introduction to amplifier design - These tutorials will teach you in very easy steps how to design A class amplifiers.

Negative feedback output circuit - Negative feedback is often referred to as shunt feedback in conjunction with emitter degeneration.

Choosing a headphone for 160m - Weak Signal Audio 160m, choosing a headphone for weak signals reception

OZ4HZ APRS tracker - The 4Hz tracker - APRS tracker with AT89C4051, now also with 5W transmitter onboard.

Filters and Ferrites in EMC - This article is about the characteristics and use of various filters and ferrites for solving amateur radio electromagnetic compatibility problems involving breakthrough of amateur signals into domestic equipment such as television sets, video recorders stereo sytems etc.