Hi Skip I have been monitoring a ROS idling over time using DL4YHF's Spectrum Lab. Here is the results.You can clearly see a pattern
73 de LA5VNA Steinar On 26.02.2010 12:29, KH6TY wrote: > Alan, > > Of course, the FCC rules on SS are outdated and ROS should be allowed > due to its narrow spreading range, but the road to success is not to > just rename a spread spectrum modem to something else and try to fool > the FCC. This is a sure way to lose the battle. The genie is already > out of the bottle! > > Instead, just petition the FCC for a waiver, or amendment, to the > regulations that are a problem, to allow FHSS as long as the spreading > does not exceed 3000 Hz and the signal is capable of being monitored > by third parties. Do this, and there is not a problem anymore. But, do > not try to disguise the fact that FHSS is being used by calling it > something else, as that undermines the credibilty of the author of the > mode and will make the FCC even more determined not to it on HF/VHF. > > It looks to me that the tone frequencies are clearly being generated > independently from the data and then the data applied to the randomly > generated frequency. There is NO pattern to ROS like there is to FSK > modes, even to 32 tone FSK (Olivia 32-1000) or to 64 tone FSK > (MT63-2000). This is a signature of FHSS. > > “/If/ it walks /like a duck/, quacks /like a duck/, /looks like a > duck/, it must be a /duck/”. > > It looks like ROS really is FHSS when you look at it on a spectrum > analyzer, and the spectrum analyzer does not lie. > > 73 - Skip KH6TY > > >
