Frank Dresser wrote:

IBOC was engineered from the get-go with compatible recievers in mind.
The receivers would autoswitch from the analog to the digital signal.
Was DRM engineered with such autoswitching receivers in mind?

Obviously a DRM receiver can handle both analogue and
digital signals.
Once a DRM signal is received, all parallel frequencies of
the service are automatically stored in the receiver's memory.
If the signal becomes weak the receiver will automatically switch
to a better signal (if available), even in other bands.
With a small amount of digital information added to an existing
analogue AM broadcast (AMSS, AM Signalling System) the
receiver recognizes the alternative frequency information and
schedules for other DRM, DAB, AM and FM transmissions
carrying the same or related programme material.
When you tune in to an analoque AM transmission on 630 kHz
in the medium wave band the receiver could let you listening to
for instance a DRM broadcast on 9740 kHz on short wave.

Are any such autoswitching receivers currently available?

Himalaya DRM2009
http://www.himalaya.com.hk/index.php... d=28&lang=en

Morphy Richards DRM Radio
http://www.morphyrichards.co.uk/inde...SR03&ORLID=ENG

Both receivers are equipped with the modern RadioScape
RS500 module.

gr, Hein