March 2008

March 2008


Convention time

All attention turns to the NAB Show this time of year. It is the biggest industry event of the year after all. Even if you don't go or have never gone, it still has some relevance, since this is where the latest product developments and technology introductions specific to broadcasting are unveiled.


New Delivery

We live in a time when we must take a good look at the definition of radio. Why? Consider the story of a college sports fan who wanted to hear the radio broadcast of a recent football game, but wasn't near a radio. He used his cell phone to get online, navigate to the station that carried the football game broadcast, clicked on Listen Live, and heard the game. He wasn't listening to FM or AM signal propagation. He was listening to a digital audio stream, but wasn't it the same material that was heard over the air?


Tennessee Turnaround

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 engineer's guide to the NAB Show

Time is our newest scarce resource. We can't afford to waste any of it. Your time at the annual convention is even more valuable, because even though

2008 NAB Extra!

New Products at the 2008 NAB Show from APW, Audioarts Engineering, Avlex, Avocent, Axia Audio, Barix Technology, Broadcast Software International, Burk Technology, Dialight, Dielectric, DK Technologies, Enco Systems, Harris, Heil Sound, Hosa, JK Audio, Klotz Digital., LEA International/Transtector, Mayah Communications, Neutrik, Power Module Technology, Propagation Systems, RCS, RTW Radio-Technische Werkstatten, Samson Technologies, Sennheiser Electronic, Sonifex, Soundfield Research, Staco Energy Products, Stream Guys, Switchcraft, Tascam, Telos Systems, Vorsis, Wirecad, Yamaha and Zaxcom.

NAB Sessions 2008

What's a convention without sessions? The Broadcast Engineering Conference (BEC) is loaded with topics covering new and digital technology. The engineering

Colorado Public Radio Goes Surround

When I began evaluating surround technology, I had a number of mandates to fulfill as the technology specialist for CPRN, and its flagship stations, KVOD-FM Denver, and KUSC-FM Los Angeles. CPRN provides 24-hour broadcast programming and Internet streaming for its 60 public radio station network, as well as HD Radio programming distributed through NPR.


Tips on mic booms, mic spring, silent mic boom, lpb mic, analog cell phones, and metric screws

Flying springs, analog cell phones and extra pieces.


Commission stepping up rule enforcement

A Texas AM station was fined $8,800 for failing to maintain a main studio and power down at sunset. An FCC inspector, after checking on four successive days, could not find the station's main studio. While conducting this search the agent took signal measurements and determined that the station was not powering down at night as its license required.


Forgotten modulation methods

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.


Field Report: Day Sequerra M2.2R

Day Sequerra has updated its M2.0 HD modulation monitor, adding some nice and very useful features. I first reviewed the original M2.0 in Radio magazine in May 2006, and the new M2.2R model is an attractive piece of test equipment that will likely go in your facility where it can be seen by you and others.

Field Report: Kowa PX-10

Some devices have a front panel that demands attention. Such is the Kowa PX-10 flash memory audio player. This box simply belongs in the studio; but is the PX-10 more than just eye candy for the control room?


The gains for HD Radio

One reader writes, "I don't know how far HD Radio-equipped stations blanket analog AM stations but I can provide you with a very educated guess that the actual receiver has a lot to do with rejecting that interference or permitting it."


Sign Off

Old General Electric FM radio ads, staff photos from WTOA-FM and HD Radio's role in new automobiles.


Currents Headlines from the March 2008 Issue

The online headlines from the March 2008 issue of Radio magazine.

Radio Currents Online - Mar 31 - Apr 6, 2008

The technology, business, people and product news of the radio broadcast industry updated every day for the week of March 31 - April 6, 2008.

Radio Currents Online - Mar 24 - Mar 30, 2008

The technology, business, people and product news of the radio broadcast industry updated every day for the week of March 24 - 30, 2008.

Radio Currents Online - Mar 18 - Mar 23, 2008

The technology, business, people and product news of the radio broadcast industry updated every day for the week of March 18 - 23rd, 2008.

Radio Currents Online - Mar 10 - Mar 16, 2008

The technology, business, people and product news of the radio broadcast industry updated every day for the week of March 10 - 17th, 2008.

Radio Currents Online - Mar 3 - Mar 9, 2008

The technology, business, people and product news of the radio broadcast industry updated every day.

Radio Currents Online - Feb 25 - Mar 2, 2008

The technology, business, people and product news of the radio broadcast industry updated every day.


Contributor Pro-file: Jim Paluzzi

Meet the contributors who write for Radio magazine.

March 2008 Advertiser Links

Links to the advertisers in the March 2008 issue of Radio magazine.