Hello,
Here are a few links to sites for the AOR Digital Voice modem.

http://www.standpipe.com/w2bri/index.htm Magnetic Loop Antennas

http://www.aorusa.com/ard9800.html AOR Digital Voice Modem

http://www.standpipe.com/w2bri/fastmodem/review.htm Interesting Voice
Modem Site

Enjoy.
73 de VE3JGE