Tuesday, January 24, 2006
HD digital radio-FIND A BETTER WAY, OR FORGET IT!
Here is radio expert Robert C. Crane's http://www.cccrane.com/ (the radio company) analysis and letter about digital AM IBOC creating a usable signal only within the IBOC stations 2mV/m local analog coverage area. Crane proves that the coverage area of an AM digital IBOC station is 1/40th of the stations analog coverage area.
According to Crane, past the local 2mV/m analog coverage area AM IBOC creates severe jamming interference to other analog stations, and reverts back to a noisier (digitally hissed) signal on the HD radio.
For a typical AM station, the 2mV/m signal only extends a few miles from the tower.
Other reports from HD radio users claim the signal starts to become spotty and revert to analog beginning at the much shorter 5mV/m coverage area.
Calculations show the -28 db AM digital signal equals about 1.5 watts of signal per kilowatt of licensed broadcast power, but creates jamming interference to adjacent channel stations at a much greater distance because of the high density, loud, irritating, digital hissing, jamming waveform. The digital waveform used for HD radio is similar to very successful radio jamming waveforms used to jam radio stations during the cold war.
HD digital radio creates many more problems, and much more trouble and expense, then any slight benefit it can provide to broadcasters or listeners. The only profit seems to be to the cartel peddling this defective technology.
The NRSC-5 "mask" often sited as an FCC "standard" has not yet been accepted, and can not be found in the FCC rules. The "mask" was created, and is being claimed as a standard by the same cartel hypeing HD digital radio to sell equipment and expensive use licenses.
Be as sceptical about the wild claims made for HD digital radio by their hucksters, as you would be the claims made by politicians or used car salesmen. They are cut from the same cloth.