Hi John I can confirm .There is no difference in the transmitted spectrum. Here some comparing done with DL4YHF's Spectrum Lab
ROS v2.6.1 x's http://home.broadpark.no/~saanes/bilder/ROS%20v2.6.1_xxx.jpg Idling http://home.broadpark.no/~saanes/bilder/ROS%20v2.6.1_idling.jpg ROS v1.6.2 x's http://home.broadpark.no/~saanes/bilder/ROS%20v1.6.2_xxx.jpg Idling http://home.broadpark.no/~saanes/bilder/ROS%20v1.6.2_idling.jpg la5vna Steinar On 06.03.2010 10:00, John B. Stephensen wrote: > The document that the author of ROS originally published, "Introduction to > ROS: The Spread Spectrum", contains a good description of frequency-hopping > spread-spectrum (FHSS) techniques. Section 4 describes taking a 250 Hz wide > mode (MFSK16) and spreading it over 2 kHz by shifting the center frequency in > a pseuorandom sequence. The receiver changes frequencies in the same sequence > and the logic used to detect a special tone sequence to obtain > synchronization is described in section 5. The amount of spectrum occupied > increases by a factor of 8. FHSS is one way to minimize the effects of > multipath spread but there are also other techniques that occupy less > spectrum. > > Note that the author of ROS published a second doucument,"ROS Technical > Description", that contains elements of the original but does not mention > FHSS and omits any description of how data is mapped to tones. Users > comparing the original and later versions of the code haven't seen a > difference in the transmitted spectrum. > > 73, > >
