Commercial and military SS systems also use FSK so that not likely alleviate the problem. The pseudorandom movement of the center frequency is the issue. Since the object is to prevent intersymbol interference due to multipath spread, one way around the legal issue is to transmit even symbols on one set of frequencies and odd symbols on another set of frequencies.
73, John KD6OZH ----- Original Message ----- From: jose alberto nieto ros To: digitalradio@yahoogroups.com Sent: Tuesday, February 23, 2010 23:00 UTC Subject: Re: [digitalradio] Consensus? Is ROS Legal in US?` Is legal because ROS is a FSK modulation. ------------------------------------------------------------------------------ De: ocypret <n5...@arrl.net> Para: digitalradio@yahoogroups.com Enviado: mar,23 febrero, 2010 21:26 Asunto: [digitalradio] Consensus? Is ROS Legal in US?` So what's the consensus, is ROS legal in the US or not?