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It is my understanding that the “IBOC” HD standard approved by the FCC is licensed for use through a company called, Ibiquity. The cost of a license for the technology, at last glance, was in the tens of thousands of dollars, well beyond Part 15. The license fee is usually included in the cost of the new exciter or transmitter.
Additionally, the AM HD standard is still under study and won’t be ready for, other than experimental use, until the adjacent channel nightime skywave interference problem is solved. And the truth of the matter is, the solution is fewer AM stations on the band at higher power using more band space than before. So, it might be a while before you find anyone willing to develop a digital HD Part 15 AM transmitter. Right now, all the HD AM receivers use only the IBOC mask and standard.
Someone else might have more encouraging news. But even most of the AM broadscasters are sitting tight right now before spending thousands on transmitters and new wideband antenna systems. I wish I had better news.
Marshall Johnson, Sr.
Senior Pastor, President
Rhema Christian Fellowship, Inc.
Rhema Radio – The Word In Worship
AM 1660 – FM 93.5