[hpsdr] Is DRM the only free Digital AM waveform?

[Tony Langdon]

At 01:50 PM 4/7/2007, you wrote:

Further to digital voice, the only other system I know of on the ham 
bands is the AOR system, which is actually a commercial version of 
the system originally developed by G4CUO (there are still articles on 
the Net dating back to 1999).  I believe the modem side (from memory, 
a 36 carrier, 50 baud OFDM modem with FEC) of the system can be 
(legally) duplicated, but the CODEC used is AMBE, which is 
proprietary, we're not able to duplicate this one, I suspect even if 
we could, there would be IP conflicts with the rest of our code.

73 de VK3JED
http://vkradio.com


 1175918572.0