Hi,
I know that this topic is not strictly amateur related, but I'll bet that 
99.9% of us have done a lot of swl work and have listened to dx stations on 
the A M broadcast band.  The days of looking for DX on the A M band may end 
forever on September 14.  On that date, the FCC will allow HD stations to 
broadcast 24 hours a day.  Below is some quoted material from the Radio Mag 
online.
"FCC Update
FCC logo 1
IBOC Rule Changes Kick in Sept. 14
Publication of the FCC's Second Report and Order in the Federal Register on 
Aug.
16 means that the long-awaited IBOC digital radio rule changes will become 
the law
of the land on Sept. 14.
Among the most controversial new provisions will be the green light for 
24-hour HD
Radio hybrid operation on AM. Critics of Ibiquity's implementation of AM 
IBOC digital
transmission have charged that many stations currently serving a significant 
audience
within secondary nighttime coverage areas will lose that service area to 
digitally
generated adjacent-channel interference. In a separate but related move 
announced
just this week, the FCC appears to be addressing AM owner coverage anxieties 
by tendering
an NPRM that would grant new FM repeater privileges to eligible AM 
licensees.
Among other key provisions set to go into effect include the right for FMs 
to commence
HD Radio multicasting without experimental authority grants and use of 
separate FM
antennas for HD Radio hybrid operation without STAs.
Other matters, such as specific public service requirements, limitations on 
and regulatory
fee assessments for digital subscription services, and what role 
multicasting will
play in any new ownership equation remain to be addressed by future 
rulemaking.
Bob, [log in to unmask], K8LR
Skype Name: bobtinn
Life is full of challenges, that's what makes it interesting!