tech

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For Electronics / Ham Radio Enthusiasts - various article electronic PDF archives.

From 73, CQ, QST and QEX Magazine



A 10 Element Quagi For the 900 MHz Band

144-MHz Stop-Band TVI Filters

2.4 GHz Pringles Can Yagi Antenna

A 4800-Baud Modem Daugher Board For Packet TNC

A 6 Meter J-Pole Antenna

7 dB for 7 Bucks

A 146 and 445-MHz J-Pole Antenna

A Beginners Course In Assembly Language

A Compact Two-Element 2-Meter Beam

A CompactTwo-Element 2-Meter Beam

Add Remote Control to Your ICOM Transceiver

A Doppler Radio-Direction Finder

Five Element 2 Meter Yagi for $20

An Active Attenuator For Transmitter Hunting

Anatomy of a Repeater

An Audio-Noise-Based Voting Circuit

An Easy Dual-Band VHF/UHF Antenna

An EZ-Lindenblad Antenna for 2 Meters

An Inexpensive Time-Domain Reflectometer

A No Tune 2 Meter Bandpass Filter

A PIC16F84-Based CW Decoder

A PIC Based HF/VHF Power Meter

A PIC of an IDer

A PIC SWR Meter

A portable Quad for 2 Meters

A Rugged, Compact Attenuator

A Single Stage 1500 W Amplifer for160 / 80 / 40 Meters

A Six Meter Moxon Antenna

A Spectrum Analzer for the Radio Amateur

A Step Attenuator You Can Build

A 3 1/2 Band Yagi

A Tri-Yagi for 50 MHz

Automotive RFI Elimination

BIOS Data Area Information

Build An Alphanumeric Pager Decoder

Build the FoxTTL Foxhunt Transmitter

Build The Montreal Fox Controller

Lab Notes: Capacitor Basics

CATV Leakage : A Two Way Street for Interference and Cooperation

A Cheap and Easy High-Speed Data Connection

Clean Up Your Singals with Band-Pass Filters

A Communications System Using Gunplexer Transceivers

Cooper Loops for 222 and 440 MHz

Defining Your Function Keys

Lab Notes - Different Grounds for Different Shacks

Digital Signal Processing

Double-Ducky Direction Finder

D-Star Digital Voice for VHF / UHF

D-Star: New Modes for VHF/UHF Amateur Radio

A DTMF to RS-232-C Converter and HF-Link Controller

Cactus Dual band J-pole

An Easy Dual-Band VHF/UHF Antenna

Electric Fence InterferenceA Case History

Entertainment and Interference: The Two Faces of CATV

Error Correcting In Data Transmission

From Ether to Ethernet

A High-Power 13-CM Magnetron Transmitter

Home-brew Spectrum Analyzer

HSMM Radio Equipment

IEEE 802.11 Experiments in Virginia\'s Shenandoah Valley

IEEE 802.11b: Friend or Foe?

An Inexpensive, Remote-Base Station Controller Using the Basic Stamp

Intermodulation Reviewed

An Introduction to Surface-Mount Devices

Locating Power Line Noise Using TV Waveforms

Measuring 9600 baud radio BER Performance

A Microprocessor-Controlled Repeater Voting System: The RVS-8

Microwave Spectrum Analyzer On A Budget

A Minature UHF Fox Transmitter

The N0GSG DSP Radio Direction Finder

The N0GSG Portable Radio Direction Finder

Pager Handbook for the Radio Amateur

A Pocket-Size, Direct-Reading VHF SWR Meter

Interfacing Your Computer To The \"Poor Man\'s Spectrum Analyzer\"

PTT Control from Receiver Audio

RFI Intermodulation

Six Meters from Your Easy Chair

Surface Mount Technology You Can Work with It

SPI and the Printer Port

Spread Spectum Communications

Super J-Pole Antenna

A Surface Mount Technology Primer

Surface Mount Technology You Can Work with It

Build a $60 Talking Repeater Controller

The Arrow Antenna

The Four-Way DFer

The FOXBOX

The Global Positioning System

The Magnetron - A Low Noise, Long Life Amplifier

The PortaPeater

The Serial Port - Breakfast of Champions

The Simple Simplex Repeater

Basic Steps Toward Tracing and Eliminating Power-Line Interference

Lab Notes: Troubleshooting Electrical Noise

Try Copper for 2 Meters - The Cu Loop

Two Meter Tracking Transmitter

28 kbps to 9 Mbps UHF Modems for Amateur Radio Stations

A Universal Programming Cable for Radios

The Use of Pringles Containers To Enhance Network Security

Voice-Track - a Multifunctional, Talking Repeater Controller

VOIP and Amateur Radio

The WB2REMote Link

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