Hi Bill, Thanks for the comments! > IMHO any setting that increases the number of bad decodes is not worth > the time saved unless that time is in danger of being longer than the > available time before the next decode cycle. I say this because > unfiltered bad decodes cause erroneous outliers, e.g. open path plots, > that will easily mislead naive users trying to interpret result data.
Yes, I agree that bad decodes have annoying consequences - but as you said, many of them can be taken care of by better validation of the decoded callsign and grid. I don’t think that time is a factor --- the decoder is quite fast now and even the smallest computers should have no trouble keeping up with a single instance of wspr. My observation, based on a small set of tests, is that the bias setting has a negligible impact on the running time. Changing the maximum cycle count would have a much more direct impact on running time. My preference is to skootch the bias down a bit to make the decoder more agressive so that I get to see the 20 or so extra spots per hour that I wouldn’t have seen otherwise. I’m willing to have to recognize and discard one or two bad spots in order to maximize the probability of seeing that exciting long-path, or TEP, or double hop Es or (fill in the blank) spot. Please let me know if you think that I’ve set the default bias too far on the aggressive side. For the record, setting it to something like 0.48 should make the performance roughly the same as what we had before. Setting it to 0.5 makes it slightly more conservative than what we had before. On a separate matter, I've measured the frequency of the transmitted WSPR signals using a separate receiver and this latest decoder. The transmitted signal measures 0.2-0.3 Hz high (the decoder has 0.1 Hz resolution), as expected, given the 1 Hz resolution of the Modulator. Is this something that would be easy to change? I have to admit that it bothers me to be transmitting 0.1973 Hz off frequency! 73 Steve k9an ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
