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RF Engineering is John Battison's monthly column in Radiomagazine. It covers the transmission aspects of radio broadcasting.
RF filters
Nov 1, 2007,
By John Battison,P.E., technical editor, RF
Radio-engineering work is very involved with filters of one kind or another. The science of broadcasting depends on the correct passage of various frequencies through differing pieces of equipment. Some frequencies are in the audio range and others are in the RF domain. 
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Living with your license
Jan 1, 2007,
By John Battison, P.E., technical editor, RF
Your new or latest station license has arrived. How you deal with it can have a huge effect on your future.
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The road to antenna maintenance
Nov 1, 2006,
By John Battison, P.E., technical editor, RF
Before any useful maintenance can be performed it is essential to know how a system is supposed to operate and also know the licensed operating parameters. A copy of the latest proof of performance and the current license are a good place to start.
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FM antennas and radiation
Sep 1, 2006,
By John Battison, P.E., technical editor, RF
New construction can distort an AM station's anticipated service contour. This primer reviews the basics of antennas and RF propagation.
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Tower inspection and climbing
Jul 1, 2006,
By John Battison, P.E., technical editor, RF
At one time, tower climbing and inspections were something that everyone and anyone could do. In today's safety-conscious world, it pays to play by the rules and do it right.
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Three phases are better than one
May 1, 2006,
By John Battison, P.E., technical editor, RF
On the surface, three-phase operation may appear to be a lot more complicated than single-phase work.
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Engineering assistance
Mar 1, 2006,
By John Battison, P.E., technical editor, RF
Today's broadcast engineer has a much easier row to hoe than his counterpart in the middle to latter part of the 20th century.
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Transmission lines
Jan 1, 2006,
By John Battison, P.E., technical editor, RF
While they seem simple enough, transmission lines are actually very complex in nature. Their size, length and type are all important considerations when designing an RF system.
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The mystery of negative towers
Nov 1, 2005,
By John Battison, P.E., technical editor, RF
While negative towers are not as frequently used in directional antenna array designs, they can still be found in use. What exactly is a negative tower, and what does it do that is so different from a normal tower?
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The details of EIA/TIA 222 Rev. G
Sep 1, 2005,
By John Battison, technical editor, RF
The new specification's table of contents lists 15 main topics or objectives, each of which may have as many as eight subsections.
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The Doherty linear amplifier
Jul 1, 2005,
By John Battison, technical editor, RF
When first developed, the Doherty amplifier gained a reputation for difficulty in adjustment and consistent operation. Since then, it has proven to be a stable and reliable transmitter design.
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Installing AM IBOC
May 1, 2005,
By John Battison, P.E., technical editor, RF
The basic installation of an AM IBOC transmitter is similar to that for an FM IBOC installation with varying exceptions required by the different system
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FM IBOC site preparation
Mar 1, 2005,
By John Battison, P.E., technical editor, RF
What steps should you take when constructing a new facility for IBOC?
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Maintaining directional antennas
Jan 1, 2005,
By John Battison, P.E., technical editor, RF
The directional antenna system is a unique balance of art and science. Keeping it in top operating condition will preserve the system's efficiency and likely keep it in compliance with the FCC.
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Phasors and ATUs
Dec 1, 2004,
By John Battison, technical editor, RF
The phasor is not the frightening cabinet of horrors that some engineers consider it to be. While it may seem daunting, a basic understanding of its operation will make maintenance of the antenna system much easier.
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