At 07:41 PM 6/2/2010, you wrote: >In business, the decision maker frequently cannot get quality >engineering data to help make a decision, and is forced to figure >out what experts "feel" is the answer based in their own >experience. We are kind of in that postion here. I don't think >we'll steer N9HSM too far wrong if we say D-STAR is about as good, >and some claim somewhat better than, analog FM. I would add that >D-STAR is somewhat worse than FM when experiencing multipath.
It is difficult to make true objective comparisons, but my experience would agree subjectively with the above. When there is no multipath, D-STAR does noticeably outperform FM over the same path. With multipath, results vary. Certainly from a moving train in the suburbs, D-STAR is tough. As you can see at http://vkradio.com/pt.html , working FM under these conditions was routine for me, once upon a time. I haven't been able to hold a stable D-STAR signal long enough to be able to reliably access the repeaters from the train. 73 de VK3JED / VK3IRL http://vkradio.com
