SHIELDING AND SHIELDED CABLES 
An overview of shielding and shielded cables, including some practices you should know as a defense against gremlins that can mess up your circuits.    
 

For low frequency control, switching, and DC power, it is possible to get the job done without worrying too much about wiring and cabling practices. However, when RF gremlins begin to appear, suddenly, a whole new set of cautions and constraints gets piled on to your “simple” project. 

(MOSTLY) RESTORING A VINTAGE SIDEREAL CLOCK

Refurbishing a clock to be able to observe the same patch of sky for several nights in a row. 

Sidereal time is a timekeeping system that astronomers use to locate celestial objects. Using sidereal time, it’s possible to easily point a telescope to the proper coordinates in the night sky. A fellow reader of N&V contacted me about a digital clock that counted and reported standard and sidereal time, both in 24 hour format. It needed some work, and he sent it to me. Here’s how the restoration went.

HOW PHASED ARRAY ANTENNAS WORK 

Introductory tutorial on a special antenna type you need to know about.

Phased arrays have been used for years in military radars for long range detection of missiles. They’re also widely used in military and commercial aircraft radars and some satellites. These phased arrays are expensive, but today thanks to new technology and higher frequencies, phased arrays are smaller and more affordable making them practical for new wireless devices. 

1/F RANDOM TONES — MAKING FRACTAL MUSIC WITH AN ARDUINO

Make fractal music utilizing a unique dice program. 

Since we don’t have to use ancient computers any more in our programming, I decided to write a 1/f program using an Arduino.

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