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Tweaking the antenna system
Jul 1, 2008 12:00 PM
By John Battison, P.E., technical editor, RF
The last link in the broadcast chain under the control of the broadcast engineer is the transmitter and antenna system. From then on quality of reception is left in the hands of the listeners. Thus it puts the onus of transmitting the best possible signal on the station engineer. 
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Tennessee Turnaround
Mar 1, 2008 12:00 PM
By Pat Lane
WKNO-FM, an NPR member station in Memphis, began operations on April 1, 1972, on 91.1MHz with 40kW of effective radiated power. The station launched its HD Radio signal in the fall of 2007. Up to that point, we underwent incremental upgrades and adjustments to the original installation.
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A Foundation for the Future
Mar 1, 2007 12:00 PM
By Keith Stuhlmann
In its most basic description, this project entailed the addition of a 40 feet by 60 feet space attached to an older, steel-framed transmission facility, but the story extends far beyond the basics.
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Forgotten modulation methods
Mar 1, 2008 12:00 PM
By John Battison, P.E., technical editor, RF
Early in the 1930s French engineer Henri Chireix devised an ingenious method of modulation that he named most appropriately out phasing. It was based on the result of combining two out-of-phase voltages. This produces a fluctuating signal voltage that varies in amplitude as the audio signals change. This voltage, after amplification, drives a power amplifier stage with properly amplitude-modulated RF.
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Tennessee Turnaround
Mar 1, 2008 12:00 PM
By Pat Lane
WKNO-FM, an NPR member station in Memphis, began operations on April 1, 1972, on 91.1MHz with 40kW of effective radiated power. The station launched its HD Radio signal in the fall of 2007. Up to that point, we underwent incremental upgrades and adjustments to the original installation.
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Radio broadcasting and 700MHz
Feb 1, 2008 12:00 PM
By Kevin McNamara, CNE
The FCC is auctioning what may be the most important spectrum allocations of our time. This portion of spectrum will be available as a result of the FCC mandate for traditional analog broadcast television to migrate to the new digital HDTV system by Feb. 17, 2009, specifically the portion previously occupied by channels 60-69.
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A break from Tradition: Using IP for an STL
Jan 1, 2008 12:00 PM
By Doug Irwin, CPBE AMD
A station's studio to transmitter link (STL) is an integral part of its mission-critical transmission system, linking the site that generates the program material to the transmitter location itself. As such, the quality and reliability of STL equipment has always been of paramount importance. One critical aspect of an STL system has historically been lack of contention in its use.
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Staying Connected
Nov 1, 2006 12:00 PM
By Doug Irwin
With the trend toward digital audio transport, and lately data transport, a whole new generation of radio STL systems has been developed.
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Intraplex Netxpress
Apr 1, 2006 12:00 PM
By Steve Edie
Migrating from T1 circuits to an IP-based system is an adventure that, until recently, was not for the faint-hearted.
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