Sunday, April 16, 2006
HD RADIO INTERFERENCE MUCH WORSE-CLEAR CHANNEL SENIOR ENGINEER
Clear Channel senior engineer admits AM HD Radio IBOC interference is much worse then previously calculated.
(FM HD Radio interference is also much worse then measured on a spectrum analyer for the same reasons).
Not -27.8 db for AM but effectively -13.2 db. (Which is the hiss we are all hearing on our radios).
He shows why the spectrum analyzer method is misleading as to the actual effects interference, and calculates the difference, and states Barry McLarnon's calculations of much greater interference are correct. Mr. McLarnon published a series of technical articles published in "Radio Guide" and submitted engineering proofs to the FCC as a reply to HD Radio Docket MM 99-325.
I think this confession by Clear Channel's Senior Vice President of Engineering effectively guts the "all knowledgeable" HD Radio advocates who have been claiming as "fact" IBOC HD Radio causes minimal or no interference.
Of course we knew this all along, just by hearing the hiss on our radios. Never underestimate the human ear as the final test instrument for what humans actually hear.
Spectrum analyzers hear differently with eyballs then humans with ears! Those are the real life "facts."
If radio sounds bad to the ear, no one will listen, regardless of what you see on a spectrum analyzer.
HERE IS THE LINK TO THE FULL REPORT:
http://www.am-dx.com/iboc_power.htm
(FM HD Radio interference is also much worse then measured on a spectrum analyer for the same reasons).
Not -27.8 db for AM but effectively -13.2 db. (Which is the hiss we are all hearing on our radios).
He shows why the spectrum analyzer method is misleading as to the actual effects interference, and calculates the difference, and states Barry McLarnon's calculations of much greater interference are correct. Mr. McLarnon published a series of technical articles published in "Radio Guide" and submitted engineering proofs to the FCC as a reply to HD Radio Docket MM 99-325.
I think this confession by Clear Channel's Senior Vice President of Engineering effectively guts the "all knowledgeable" HD Radio advocates who have been claiming as "fact" IBOC HD Radio causes minimal or no interference.
Of course we knew this all along, just by hearing the hiss on our radios. Never underestimate the human ear as the final test instrument for what humans actually hear.
Spectrum analyzers hear differently with eyballs then humans with ears! Those are the real life "facts."
If radio sounds bad to the ear, no one will listen, regardless of what you see on a spectrum analyzer.
HERE IS THE LINK TO THE FULL REPORT:
http://www.am-dx.com/iboc_power.htm
