by Mike Cleaver » Wed Dec 13, 2006 3:20 pm
The only problem with AM other than interference of all types and limited audio frequency bandwidth is the high cost of the transmitter site which usually means 40 acres of land, underground radials and several towers and tuning huts, not to mention the huge electrical bills when compared to FM operations which usually are shared-stick operations with little land requirement.
AM is capable of high quality audio but that was limited by regulators and receiver manufacturers years ago.
And there are very few engineers around who understand AM RF operation, tuning and repair.
Most AMs are impossible to pick up in downtown Vancouver.
You can't get CKNW in front of the TD Tower, AM600 vanishes into static in many areas and if there are trolley wires around, forget about AM at all.
Remember, it cost Corus over a million recently to rehab the AM730 site which had suffered from years of neglect.
If you get an area where interference is negligible, AM600 sounds amazing in AM Stereo if you have a good AM Stereo receiver.
Most AMs also are processed to the max and clipped like crazy to get maximum loudness.
The same thing is happening on many FMs but again, it's the transmitter, the land needed, the maintenance on towers and tuning huts and the high power bills that make AM unattractive, not to mention electrical interference and limited audio bandwidth.
Mike Cleaver Broadcast Services
Engineering, News, Voice work and Consulting
Vancouver, BC, Canada
54 years experience at some of Canada's Premier Broadcasting Stations