Nautel has published a Webinar on digital AM. The Webinar is hosted by Chuck Kelly and includes guests Dave Kolesar (WWFD), Ruxandra Obreja (DRM Consortium), Joshua King (Kintronic Labs), and Philipp Schmid (Nautel). Here's the link if you are interested:
https://www.nautel.com/resources/webinars/am-transmitters/all-digital-am-in-the-real-world/
https://www.nautel.com/resources/webinars/am-transmitters/all-digital-am-in-the-real-world/