Hello Dex, Try to use a bit larger bandwidth, and use the average power function (avrg_n, see below). For FSK, MSK, and similar modes, the *power* contained in the signal is independent of the modula
Yes I have never seen anything quite like that. I have seen what might be "gravity waves" in the inonosphere induced by the shock of a CME arrival. They usually look more like halfwave recified sinew
This evening I was watching HGA22 with SpecLab plotter. When I first started the plot I noticed the signal looked as expected but when I increased the speed I saw a sine wave shape on the plot. After
Thanks Dex for sharing this extremely interesting observation. My first thought was that the ripple might have been a beat pattern caused by an interfering carrier at 1/20 Hz offset. But this explana
Hi Both, musing....if one used a very narrow capture bandwidth could that be cause by "ringing" after the telegrams ....they are usually around 10 secs apart?? Alan G3NYK
Hi Dex, http://www.w4dex.com/lf/HGA22_0030_19feb11.jpg Interesting, the sine-shaped pattern is still there - and the 'oscillation' frequency is suspiciously constant. Would be interesting to see an F
Hi Dex, You can possibly scroll back the plotted graphics (depending on the memory, or number of samples, reserved for the plotter channels). Usually the memory is larger than the visible part of the
That sound logical Peter. During the FSK transmissions there is less power in the idle frequency. Plotting DFC39 now while hearing the FSK, the two periods do match very well. If that what I am seei
Which function (especially the observed bandwidth for that signal) did you use to plot it, the peak function or the power (or effective voltage), in which frequency range ? Wolf, I use the plotter de
Hi Dex, I have no raw data from today now but here's a plot of 135.43 kHz, from 2011-02-18, ~2330-0000 utc: http://www.df3lp.de/hga22/2011-02-18_2330.png Distance is 1008 km, bearing 138 deg., select
