bc1 battery cover

ZZ Wave net antenna - Setting up a ZZ Wave antenna, a dual band loop antenna covering 80 and 40 meters.

4 band Broadband Hex-beam Antenna - Exagonal Beam antenna cover 20-17-15-10 meters By KE4NU

Z-Match Antenna Tuner project - This Z-Match is a link coupled all-band tuner. Two all band tank circuits cover 3-14mhz and 14-30mhz. The tank output links are selected with a very heavy duty SPDT rotary switch.

Multi-band Wire Antennas - Presentation by Al Peter to compare several popular center-fed wire antennas that cover multiple bands.

VKCL - Contest Log - VK Contest Log (VKCL) is a free contest log software specialising in Australasian contests but also covering some international ones too

Listen to National Hurricane Center Skywarn Nets - Live audio of the National Hurricane Center’s Skywarn Nets. This live feed covers several different states, and locations throughout the US including: TX, LA, MS, AL, FL, GA, SC, NC, VA, MD, DE, PA, NJ, NY, CT, RI, MA, VT, and ME

The Discovery of Radio Waves Heinrich Rudolf Hertz - Heinrich Hertz was the first to send and receive radio waves.

Vintage QSL Collection - This website was originally inspired by the discovery of a number of QSL (radio reception report) cards dating from the 1920s and is intended to make images of the cards available to as many people as possible.

HSMM-MESH - A high speed, self discovering, self configuring, fault tolerant, wireless computer network that can run for days from a fully charged car battery with focus on emergency communications

k7ICU Tucson AZ Repeater - The K7ICU repeater system is situated about 500' above metro Tucson, at the base of the Catalina Mountains. It is an open system providing coverage to the greater Tucson area.

Elecraft K2 - Narrow Bandpass Filter - This note covers narrowing the K2\'s 40M bandpass filter to cover the narrower 40M band and reject strong out of band broadcast interference

Kenwood TS-450S - The Kenwood TS-450S is a formidable transceiver covering 160 through 10 meters including the WARC bands with 100 watts input

Battery Bank - Specialize in batteries and batteries charges

24 MOSFET Class E RF Amplifier - This is a 24 MOSFET Class E RF Amplifier, covering the 80 and 160 meter amateur radio bands.

Frankenstein. Heavy duty single 3-500Z Amplifier - This project will be a single 3-500Z with a twist. This amp will run about 3600 volts on the anode which should allow for a full kilowatt with about 50 watts of drive. This amp cover 20,40,80 160 meters

811 Linear Amplifier project - A lower power desktop linear with integrated 120vac power supply. This, very compact, dual 811 version will deliver about 300 watts output. Covers all bands including WARC bands.

Automatic Battery Charger Project - A project for an automatic battery charger from 12.6v to 13.8v

Adjustable Regulated Battery Charger - This battery charger circuit is regulated and adjustable to make this circuit able to charge the mosto NiCAD battery.

A NiCAD Battery Charger - A NiCAD Battery Charger with Current and Voltage Limiting

Inside Compact Fluorescent Lights - Discover the huge amount of components inside Compact Fluorescent Lights

AVR Butterfly Keyer - The Atmel AVR Butterfly is a credit card sized board which contains an AVR MEGA169 processor, a six character LCD display, a five way joystick navigation switch, a piezo speaker, a 3 volt lithium battery cell for power and a few other odds and ends.

ZL2PD CMOS Keyer - Two cheap CMOS ICs and a few transistors was all that was required to rebuild an elderly TTL automatic morse keyer into a low current lightweight battery powered iambic morse keyer.

Circuit Improvements for the TS-440S - Some improvements for the Kenwood TS-440S, including distortion level in SSB in transmitted signals, Lack of crispness in the RX audio and Limited transmit frequency coverage.

A 12-Volt Homebrew Regen - A one-tube battery-powered regenerative receiver.

Grip Dip Oscillator - Originally eveloped by I1FLC, uses seven plug in coils covering 3.0 to 30Mhz in a Colpitts oscillator circuit.