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.
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.
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.
There are many lists extant of precautions to take before working with high voltage pieces of equipment. Lethal incidents may be more often caused by completely unexpected circumstances than from pure, careless accidents.
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.
Harris has donated a high-power FM radio transmitter and digital exciter to the Southern Alberta Institute of Technology (SAIT) in Calgary.
With HD Radio, it's important to monitor and measure the time alignment and level alignment between the analog modulation and the MPS, and stations will likely want to monitor the RBDS on the analog channel along with PAD data for both the MPS and SPS. Fortunately, there are now multiple monitoring devices made specifically for HD Radio, and each of these devices gives the end user options about which parameters are to be measured, and how the device is to alert the user once a problem is detected.
The NAB AM Antenna Computer Modeling Seminar held at the NAB headquarters in Washington, DC, the week of Nov. 12, 2007 attracted 45 engineers.
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.
In recent years, the introduction of wireless networks allows users to work anywhere within a defined location. The technology behind wireless networks changes almost yearly, but one thing remains the same: the antenna.
Tower lighting requirements, which are specified in part 17 of the Commission’s rules, sometimes come as a financial shock.
Simply put, the Collocom-2 is an easy-to-install, solar-powered device used to play an audio warning or safety message at a tower site.
Take some time to ensure that basic legal and FCC rule obligations are met when taking over as the chief operator at a station.
WHK celebrates its 85th year this year, the original Media Touch system is revisited, and the next wave of radio listeners are listening to radio at all.
A group of broadcasters, consultants and manufacturers have petitioned the FCC to allow moment method modeling of AM directional arrays as a ways to reduce the burden of taking field strength readings in determining coverage.
Do you remember? The first Continental Electronics 317C 50kW AM transmitter was installed in 1965. The transmitter was mostly solid-state and featured
Broadcast Electronics (BE) returned from the NAB convention with a number of transmitter sales, including some from Univision and Regent Communications.
Broadcast Electronics (BE) reports that its line of solid-state FM HD Radio transmitters now exceed the previous benchmarks for output power and spectral performance.
The commission has always been subject to political influence—as an agency created and funded by Congress, this is to be expected—but a blatant rule override to accommodate a politically connected illegal operator is discouraging to the honest broadcasters.
From finding land to filing a Form 302: an overview of the steps for completing an upgrade.
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.
Exploit the latest wireless technologies to enhance the listener experience. After all, the terrestrial-based transmitter is only one of the possible delivery systems that radio stations can use.
WXPR chose Nautel's V5d for transmitting its HD Radio signal via the space combining method.
The advent of HD Radio is requiring the broadcast industry to take a closer look at its station's networking system and infrastructure. Minimizing network-related
The Surround Sound Audio Task Group's latest effort is a paper that discusses surround on radio. Steve Fluker, co-chairman of the group, explains the paper's details.