SS uses pseudorandom codes to wag the carrier(s). EVERY pseudorandom code is repetitive, the length may vary.
73, Rein PA0R --- In [email protected], KH6TY <kh...@...> wrote: > > That's a good analysis, Steinar. Is it possible to see if the pattern > changes when sending data? That is all the FCC is concerned about. The > pattern has to change when sending data and not just remain the same to > exclude it from being FHSS. > > 73 - Skip KH6TY > > > > > Steinar Aanesland wrote: > > > > [Attachment(s) <#TopText> from Steinar Aanesland included below] > > > > 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 Of course, the FCC rules on SS are outdated and ROS should be allowed 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. > > > > > > â/If/ it walks /like a duck/, quacks /like a duck/, /looks like a > > > duck/, it must be a /duck/â. > > > > > > 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 > > > > > > > > > > > > > >
