This turned out to be really simple.
Step 1: If you haven’t already done it…Get the transceiver connected to a PC using the USB cable and appropriate drivers. When this is successful, you should have the ability to get sound from (Microphone – USB Audio Codec) and send sound to (Speakers – USB Audio Codec) the transceiver in your PC “Audio” options.
Step 2: Get Dream. It’s available at Sourceforge. No install is needed, just unzip the folder and put it somewhere you can find it.
Step 3: Get the codec. Search for “faad2 audio codec”. The file “faad2_drm.dll” needs to be put into your Dream folder.
Step 4: Transceiver setup.
a) MENU – SET – Connectors – ACC/USB Output Select. This should be set to “IF”.
b) Tune DRM broadcast. Set your transceiver to “AM”. Set the bandwidth to 10 kHz (i.e. -5kHz / +5kHz)…I think it’s as wide as you can go on the 7300.
c) Start Dream by double-clicking the “dream.exe” file in the Dream folder. Then go to “View”…”Evaluation Dialog” to open the detailed signal dialog.
d) Not all Dream signals you see will be decodable. It seems to take a fairly high signal-to-noise ratio to get a solid audio decode and most broadcasters don’t aim their signals at North America anymore. Something like +16dB at least. +20dB works very well. You can decode the metadata (station, transmitter location) at lower SNR.