On Sep 15, 2010, at 10:15 AM, Alan Bloom wrote: > If you turn on averaging in the waterfall you can see farther down into the > noise. It works best on steady carriers. With CW signals you have to keep > the averaging time less than a dit.
I have found that per-bin averaging of the power spectrum works rather well even with low duty cycle, keyed carriers. Take a look at the two waterfalls in the "Weak Signal Button" section that is almost at the end of this page: http://homepage.mac.com/chen/w7ay/cocoaModem/UsersManual/mfskManual/mfskManual/dominoex.html The signal that you see there is DominoEX, where each carrier is present on average for only one out of 18 chip periods. Moreover, with DominoEX, if a carrier is on for one chip, it is always off during the next chip, so there is never a "dah," as in CW, but only very short "dits." 73 Chen, W7AY ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
