MP11 is the widest-bandwidth backward-compatible HD Radio extended hybrid service mode and provides a commercially viable method for stations to get increased HD Radio audio or data capacity while maintaining backwards compatibility with analog FM.
The story behind the extended hybrid service mode MP11 is interesting, and the global COVID-19 pandemic paused publicity of the successes and deployment of the mode.
MP11 was conceptualized in the original NRSC-5 documents circa 2005 and authorization for extended hybrid mode operation was adopted by the commission in 2007. However, it was not developed for commercial use until almost a decade later.
It was initially thought (more than two decades ago) that the risk of “host…
