Coax cable characteristics and parameters explained

All About Telephone Circuits and Operation

What Are Decibels?

QRP/SWL Homebuilder Projects

All You Need To Know About Circuits

Understanding Computer Sound Card Interfacing

DeForest Audio Vacuum Tube

Ham Radio Band Plan Chart (effective 2/23/07)

How to construct a 2M Cu Tubing J-Pole Antenna

TASMA Southern California Band Plan

How to construct a 10 Meter Dipole Antenna

TASMA 2M Repeater List  (revised 8/16/2006)

Repeater Basics

Yaesu Amateur Radio Manuals ( free downloads)

Sporadic E VHF Propagation

ICOM Amateur Radio Manuals (Free Downloads)

Differences between the geomagnetic A and K index

Alinco Amateur Radio Manuals (Free Downloads)

HF Propagation Tutorial

Kenwood Amateur Radio Manuals (Free Downloads)

Sun/Earth/Ionosphere: What the Numbers Mean, and Propagation Predictions 

Free Technical Books (Online Download)

Amateur Television (ATV) Project

Glossary of Ham Radio Terms

N1MM Free Contest Logger

eQSL - The Electronic QSL Card Center