On Feb 7, 4:22*am, Ron Hardin wrote:
- WBBM 780 Chicago starting last week has turned
- off their IBOC before dawn at least, as evidenced
- by the sudden audibility of WABC 770 NYC listening
- in Ohio, free of overwhelming IBOC hiss-wash.
-
- WJR 760 Detroit seems to have ceased somewhat
- longer ago, and now WABC is a clear channel again.
- --
-
-
- On the internet, nobody knows you're a jerk.

RH - Clearification Please
"turned off their IBOC before dawn at least"

Is WBBM-AM 780 kHz in Chicago, IL turning 'Off' the
IBOC Transmission from Dusk-to-Dawn {Over-Night} ?

-or- Only a few hours before Dawn say 4~5 AM to 7~8 AM ?

i want to know ~ RHF