Confused I am. In the US, are there digital transmissions in the AM
Unfortunately, there are digital transmissions in the North American Medium Wave band , AKA, AM band.
iBiquity's in-band on-channel (IBOC) digital radio technology used by AM and FM radio stations.
A far as I’m concerned, it just makes a MW DXers life more difficult.
I can’t find a radio that receives HD AM.
I don’t know if they’re even made.
I think the HD format was introduced for Automobile Radios.
HD radio hasn’t gained wide spread acceptance.
As far as I know, there are no DRM broadcasts emanating on this side of the Pond.
I can’t even find a DRM Receiver, except for SDR types.
I bet someone more knowledgeable on the subject can answer your inquiry better.
73 Gary Vance, Grand Ledge, Michigan U.S.A.
HD Radio is a trademarked term for iBiquity's in-band on-channel (IBOC) digital radio technology used by AM and FM radio stations to transmit audio and data by using a digital signal embedded “on-frequency” immediately above and below a station's standard analog signal, providing the means to listen to the same program in either HD (digital radio with less noise) or as a standard broadcast (analog radio with standard sound quality). The HD format also provides the means for a single radio station to simultaneously broadcast one or more different programs in addition to the program being transmitted on the radio station's analog channel.