[HCDX] Groundwave propagation on SW

[aurel chiochiu <acq@xxxxxxxxxxxx>]

Hello again !

I have a question for those of you specialists on the propagation of radio waves. How far from the tx-site, a SW signal can reach without being reflected by the ionosphere thousands of kilometers away or so ? I mean what is the groundwave reach of a signal on the 49 meters band, for exemple ? In my opinion, shortwave signals, especially those on the low frequencies (i.e.: on 11 MHz and below) do follow the Earth curvature a little bit before escaping into the space and being reflacted by the ionosphere at great distances, but they follow the Earth curvature at a much lesser extent compared to MW and especially LW, but still the distances propagated without ionospheric propagation are greater than on FM, because on SW there is groundwave and on FM just line-of-sight within the horizon, this within taking tropo-scatter in considerance ! (i.e.: groundwave on SW will be around 100 kilometers and line-of-sight on FM would be only 80 kilometers). For exemple a station like the TIme SIgnal outlets in Ottawa, CHU, on 3330 and 7335 kHz will reach only 100 kilometers via pure groundwave compared to 600 kilometers GW reach of a signal on the low-end of the MW band, like my local CINF Infos 690, on 690 kHz wich can be picked up in Rivière-du-Loup (north-east of Quebec City) via groundwave almost 500 kilometers from Mtl.

I`m also interessed in listening to real-audio recordings of STEADY GW signals received on SW. I don`t know why but I think it would be VERY interesting to hear a fade-free signal on SW - for me shortwave is synonymous with fadings, but I know there is groundwave on SW.

Thank you very much,
Bogdan
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