The closest you get to a true definition in Part 97 is in section 97.3 Definitions, Para C, line 8: (8) SS. Spread-spectrum emissions using bandwidth-expansion modulation emissions having designators with A, C, D, F, G, H, J or R as the first symbol; X as the second symbol; X as the third symbol.
ROS uses SSB so the first designator is J (this meets the definition) and it uses bandwidth-expansion. (this meets that definition as well) Thus, taking this definition literally, it is indeed Spread Spectrum and is thus illegal below 222MHz....at least that the conservative interpretation that I'll stick with until we get a ruling otherwise. ==================== Dave K3DCW Real radio bounces off the sky On 21 Feb, at 2:45 AM, J. Moen wrote: > > > What is the FCC definition of spread spectrum, and where can it be located on > the internet? > > Jim - K6JM > > ----- Original Message ----- > From: John B. Stephensen > To: digitalradio@yahoogroups.com > Sent: Saturday, February 20, 2010 7:58 PM > Subject: [digitalradio] ROS - make it legal in USA > > > ROS is MFSK16 with frequency hopping so it is SS per the FCC definition as > the bandwidth is expanded. However, the FCC never fined anyone during the > period when Hellscreiber was used illegally so I doubt that they would do so > with ROS. > > What ROS users should do is email their ARRL representative and have them > petition the FCC to change the rules. One solution is to eliminate the > emission designators and change the RTTY/data segment of each HF band to > 0-500 Hz wide emissions and the phone/image of each HF band to 0-8 kHz wide > emissions with 0-20 kHz above 29 MHz. > > 73, > > John > KD6OZH > >
