There is a technical descrption at http://rosmodem.wordpress.com/. I doesn't describe the start and stop tone sequences or completely describe the mapping from the convolutional encoder to the 128 tones used for data. However, it's more compete than some of the technical specifications on the ARRL web site. Perhaps he can add more detail in the future.
73, John KD6OZH ----- Original Message ----- From: jbh...@bluefrog.com To: digitalradio@yahoogroups.com Cc: AE5IL Sent: Saturday, February 27, 2010 20:27 UTC Subject: [digitalradio] ROS Technical description for the FCC in the US §97.309(a)(4) Technical Descriptions This is a one-stop Web site for technical characteristics called for in FCC rules § 97.309(a)(4), which reads: (4) An amateur station transmitting a RTTY or data emission using a digital code specified in this paragraph may use any technique whose technical characteristics have been documented publicly, such as CLOVER, G-TOR, or PacTOR, for the purpose of facilitating communications. Documentation should be adequate to (a) recognize the technique or protocol when observed on the air, (b) determine call signs of stations in communication and read the content of the transmissions. Click on names of the techniques already documented: A technical description from you about ROS would help us in the US a lot. For other technical descriptions go to www.arrl.org/FandES/field/regulations/techchar/.