Our southern neighbors have formally communicated that they want the FCC to reconsider its order authorizing AM IBOC operations at night. A recent Radio World Online article outlines the objections. Leonard Kahn’s TheWrathofKahn.org site has a copy of the letter which objects to FM IBOC authorizations as well.
This is one more bump in the road for digital Medium Wave Broadcasting, but I think that our neighbors south of the border are probably just reserving their places at the table. I have heard that at least one Mexican station has begun broadcasting in IBOC.