[digitalradio] Re: ROS HF Path Simulations
Tony, Thus there is no thruput advantage compared to modes wich use less bandwidth. (and not even between the two baud rates in ROS) So: ROS 2250Hz mode is too wide for the crowded bands we already have. Or: operating ROS is contradictory to common HAM radio operating practice. Or: ROS is like driving a SUV in the inner city of Amsterdam. Therefor: three hard coded calling frequencies [on the 20m band] for a too wide mode (compared to current common modes) is pushing band capacity to, or even over the limit. So those who still think ROS is a nice mode to experiment with are blind for the facts about ROS from a mere technical perspective. So not even talking about the social aspects of the development of ROS and it's developer, that also contradicts common operating practice as has been shown in this group. But I am repeating myself... ;-) Marc, PD4U --- In digitalradio@yahoogroups.com, Tony d...@... wrote: On 8/5/2010 12:32 PM, pd4u_dares wrote: While the mode performs well over HF, the additional bandwidth doesn't appear to have any throughput advantage over other modes that use less spectrum. In fact, path simulations indicate that there is no difference in throughput between ROS 500/16 and ROS 2250/16. SIC Marc, PD4U Mark, Comments? Tony
Re: [digitalradio] SCS PTC-II and regular digital modes
I have the same interest, and would also be interested in answers to Julian's questions. Andy K3UK On Fri, Aug 6, 2010 at 5:31 PM, g4ilo jul...@g4ilo.com wrote: I have been wondering about getting an SCS multimode controller, the PTC-II USB. Primarily I am interested in getting the best performance for HF APRS which is what my radio does most of the time while I am otherwise engaged. I have no interest in Winlink but am interested in trying Pactor-II which people have said can hold QSOs even under very difficult conditions. Is there much activity on the mode? I don't want to deny myself the opportunity to use PSK31 or RTTY but the SCS would plug into the rear audio connections of my transceiver and I don't want to have to grope around the back changing plugs just to use soundcard modes. I understand these controllers can do PSK and RTTY as well but I don't see how this works with the programs I am familiar with. I'm also unsure how the transceiver control works. I currently have a separate serial cable to my K3 for this. If any users of the SCS controllers could pass on their experiences to a prospective user I would be extremely grateful. Julian, G4ILO _
