On 02/21/2010 04:16 PM, KH6TY wrote: > Did you see the recent post by K3DCW? > > 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.
http://life.itu.ch/radioclub/rr/ap01.htm If you look at the list there, it would appear that ROS is J2D (under the SSB interpretation) or V2D. Not AXX CXX DXX FXX GXX HXX JXX or RXX. You can read the rules as strictly as you want and limit your activities that way, but I believe some common sense questions like "does this mode take more bandwidth than other modes?" and "does this mode cause more interference than already allowed modes?" will carry more weight than the choice of a single word in the description of the modulation. Modes that jump around inside an SSB passband according to a pseudo-random number sequence are already legal, and in fairly widespread use, on the HF amateur bands. Modes that send a data stream across multiple sub carriers inside an SSB passband are already legal, and in widespread use, on the HF amateur bands. ROS is not doing anything different. The only thing different is one single word in the creator's description of the modulation. If you want to limit your own activities on the HF bands, feel free to give more importance to that single word than to the technical details of the ROS modulation. -- All rights reversed.
