ARTICLES

SECURITY ELECTRONICS SYSTEMS AND CIRCUITS — PART 4 - Ray Marston
Take a look at practical visible-light optoelectronic security circuits in the fourth episode of this series.

NAKED DATA - Ryan Sheldon
Explore the power of wireless data communications using inexpensive off-the-shelf hardware.

PRODUCT REVIEW — PINT-SIZED SSB OFFERS GREAT PERFORMANCE - Gordon West
The SGC-2020 transceiver packs a powerful punch in a small package.

HIGH-FREQUENCY 2-50 MHz AUTOMATIC ANTENNA COUPLERS - Gordon West
Discover a single tall whip that can be externally resonated to work on any and all frequencies from 1.8 MHz up to 52 MHz, plus explore base station use of a long-wire antenna that may also be externally resonated.

COLUMNS

AMATEUR ROBOTICS - Karl Lunt
Fire-Fighting robot results, the ADAPT-11, and final farewells ...

OPEN CHANNEL - Joe Carr
Some measurement tricks.

RESOURCE BIN - Don Lancaster
New opportunities in home automation.

STAMP APPLICATIONS - Jon Williams
Building a custom digital thermometer.

SOFTWARE WIZARDRY - Harry Helms
Server-side programming.