Consulting Engineer Highlights DRM AM Tests in India
     
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Professional engineer Ted Schober has blogged about some Digital Radio Mondiale tests of its AM system at India’s national broadcaster All India Radio.

In an e-mail to colleagues (subject line: “Finally! Something exciting for AM technology”), he stated he feels the tests demonstrate a digital AM system that could be viable in the United States.

Schober says DRM’s so-called “AM single-channel simulcast” doesn’t appear to cause adjacent-channel interference and promises inexpensive battery-powered receivers. “I find this news heartening, seeing the slow to non-existence of growth in AM HD,” he writes. “Perhaps a little competition on the technical field will help AM broadcasters to have a stake in the future.”

His company is a technical consulting firm and equipment supplier. Find the article on AMband.org.

All India Radio previously chose DRM as the technology for converting its analog network to digital, according to the DRM Consortium (PDF).

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Even if the FCC would extricate its head from its hind end, the medium wave band can not hold as many stations as it has now. Interference will still be a problem until we move the new stations and the little stations to a new VHF digital band. New stations = Stations that were licensed after the 1st of January 1970. Little stations = Stations that have less than 5,000 watts at night. Part 15 rules on interference should be enforced strictly so power lines will not cause as much interference as they cause now.
By James Johnson on 9/2/2010
The technology for co-existing DRM and analog sounds like an excellent alternative to IBOC , if the claims are true. This could be an excellent solution the many AM stations digital concerns.
By Anonymous on 9/3/2010
AM interference from other AM stations is a red herring. The problem has always been 3 things: 1. absolutely terrible frequency response, 2. Poor receiver sensitivity, 3. Locally produced interference When I tune around the AM dial, on an average table radio, in my top 100 market, I can hear just 5 stations during the day and only two at night. I can hear 25 FM signals. A few years ago, while sitting in a hotel in Atlanta, I took my Sangean AM/FM walkman and tuned around the dial one evening. I could hear about 10 AM stations. I don't know how many FMs there were, but there were more than 10 in the NCE portion of the band alone. I'm sure that there are cases of AM interference between adjacent channels, but in most markets this is not a problem and as proof, I offer the notion that AM stations thrived for 50 years, even on the Mexican border where interference was rampant. The end came when FM offered better sounding radios that could receive more stations. It makes me crazy to hear this nonsense about AM interference causing the downfall of the medium. Look to history a little, folks!
By Anonymous on 9/3/2010
DRM won't work here in the U.S. There's nothing in it for greedy American corporations and, more importantly, nothing to lobby the corrupt FCC for. Essentially, no money to be had and no kickbacks to hand out.
By Anonymous on 9/7/2010

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