Very simple change just add ³greater than 3 khz² to the existing rules.
On 7/13/10 3:28 PM, "Dave Wright" <[email protected]> wrote: > > > > > > I think that a lot of people are missing the point with ROS and Spread > Spectrum here in the US. > > The author defined it as Spread Spectrum, only changing it to FSK144 (or > whatever) after being told that SS was not allowed below 1.25m in the US. The > FCC rules don't mention bandwidth in relationship to SS, they don't say that > it "must employ bandwidths that greatly exceed the bandwidth necessary to > convey the intelligence", nor do they reference any Wikipedia/ARRL/RSGB/ITU or > other organization's definition. They simply mention SS as not being allowed > below 1.25m. So, you can say that it is only 2.2kHz in bandwidth, but if it > is spread spectrum within that 2.2kHz of bandwidth, it is illegal in the US > below 1.2m. It could be 500Hz in bandwidth, but if it uses SS, then it is > illegal. > > Is this the way it should be? No. Does it impede innovation and development > of new mod es? Yes. However, the way the rule is written is what we have to > follow. Don't like it? Then petition the FCC to modify part 97 to allow SS > within a limited bandwidth (say 3 kHz). As Skip has pointed out, there is a > way to do this without mentioning ROS (or CHIP64/128) or any other SS mode. > Quote the definition and petition for a modification, possibly with a > bandwidth restriction, possibly without. But, without changing the rule, the > rest of the discussion is moot. > > Dave > K3DCW > > > On Jul 13, 2010, at 2:23 PM, [email protected] wrote: > >> >> Hi Alan, >> >> Why did you wait so long with contributing here? >> Please explain. >> >> ++ In Feb of this year I quoted from the ARRL's Spread Spectrum Source book >> page 5-2 ++ >> >> " Spread Spectrum Fundamentals " >> >> SS systems employ radio frequency bandwidths that greatly exceed the >> bandwidth necessary >> to convey the intelligence. >> >> Bandwidths for SS systems generally run from 10 to 100 times the information >> rate. >> >> etc etc. >> >> I got shouted out of the Group by addressing the use of ROS in the US by the >> experts on >> SS. > > > Dave > K3DCW > www.k3dcw.net <http://www.k3dcw.net> > > > > >
