DavidEduardo said:
Mike Walker said:
It's good to know that a few are doing it. Even assuming there are no problems with AM HD, many AM stations aren't "flamethrowers". They barely (if at all) cover their metro with an analog signal. These guys will NEVER cover the entire metro with a digital signal...especially at night. Relationships with FMs make a lot of sense!
AM stations that have such marginal signals ("barely [if at all] cover their metro with an analog signal") are not competing even now. The "usable" signal for metro area AMs is now around 10 mv/m or greater due to analog noise levels. In most cases, the HD signal does as well as or better than that.
The real issue with AM is that most Top 100 markets have only a couple of viable signals. In quite a few, there are no viable stations on AM such as Washington, DC, for example...
WHO-AM News Talk Information 9.7 7.2 9.9 10.6
WLW-AM News Talk Information 8.9 9.9 11.2 9.8
WSB-AM News Talk Information 9.3 8.7 9.2 8.2
WGN-AM News Talk Information 5.3 5.5 5.8 5.4
WBBM-AM All News 4.2 4.1 4.4 4.6
WLS-AM News Talk Information 4.1 3.7 3.7 3.8
WTAM-AM News Talk Information 7.3 8.0 6.5 7.3
WJR-AM News Talk Information 4.8 4.9 5.3 5.3
KMOX-AM News Talk Information 8.4 7.7 8.2 8.4
KSL-AM News Talk Information 5.9 6.7 8.6 7.7
http://www.arbitron.com/radio_stations/home.htm
This is just a sampling of 50KW AMs ranked #1, or in the top-5. AM-HD causes adjacent-channel interference and has only 60% the coverage of analog. Terrestrial radio's TSL is declining and radio has no future:
"FOLLOW-UP EDISON MEDIA RESEARCH STUDY ON 12-24 RADIO LISTENING SHOWS SHARP DECREASES IN TSL AND USAGE"
"A new study by Edison Media Research shows sharp declines in Time Spent Listening (TSL), Persons Using Radio (PUR) and most importantly attitudes about radio among the 12-to-24-age group, the listeners who represent both terrestrial radio's future and its greatest challenge."
http://www.edisonresearch.com/home/archives/2006/09/followup_edison.php