TWiRT 76 - Green? Really?
Sunday, April 3, 2011 at 3:29PM I didn't know that broadcasters had any "green" options. Seems high-power AM broadcasters can save up to 40% on their power bills using interesting tech to manage the AM carrier power.
Kirk Harnack - Executive Director, Business Development, Telos-Omnia-Axia
Tom Ray - VP, Engineering, Buckley Broadcasting, WOR, New York, W2TRR
Chris Tobin - CBS Radio, New York
Chris Tarr - Entercom, Milwaukee, GeekJedi, and Broadcast Engineering Info
TWiRT is sponsored by Axia Audio with low-latency Livewire AoIP, even in the new, budget-priced iQ console (now shipping). Over 2,000 Axia consoles are powering studios around the world, saving engineers time and money.
Show notes:
Nautel presentation on reducing AM transmitter power usage.
AM series-fed (hot) tower lightning balls.
Chris Tarr described his station's Nautel XR6 and it's redundant amplifier drawer.
Photo of mercury vapor rectifiers.
We discussed the famous 833A triode vacuum tube, popular in many 1 kW AM transmitters.
Download the podcast here...
Reader Comments (5)
I was always taught that the carrier power has to meet or exceed the power of the sidebands or distortion will result. Basically it starts to sound like selective fading or an SSB signal. You can do CCDSB or Controlled Carrier Double Side Band. Which when done properly sounds as though you are always at 90-100% modulation. I had an old Radio Shack CB walkie-talkie that had that as a high power option. It would automatically switch between 1W and 4W power out.
For even "greener" modulation you can go reduced carrier SSB where you provide a sort of pilot signal to automatically tune what is essentially an SSB receiver. It won't work with a regular AM receiver but will with an SSB receiver. Another receiver technology I don't hear much about and wonder if it is still in use is synchronous detection. Something like that would be needed for what Kirk described at the beginning of the show.
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