Dear friends, good evening !
Hello Markus !
On Thu, 1 Apr 2010, Markus Vester wrote:
...
the Australian VLF transmitter North West Cape (NWC, 19.8 kHz) can be
received regularly in Europe. This morning I had a detailed look on the
power spectrum of the MSK signal, and found interesting 21 Hz periodic
ripples...
...
I'd be interested to see if others observe this effect as well...
...
No Markus. I'm permanently monitoring this area, more than four years
now, and I did not notice this kind of ripple here (north of France). But
maybe our aerials are very different ?
The 19.8 kHz signal of NWC, naval communication station Harold E. Holt,
Australia, as received here, is very clean, as well the 21.4 kHz NPM
Lualualei, Hawaii, which is not a too bad DX too I gess.
About NWC 19.8 kHz, the signal disappear in the morning, and is coming
to live again somewhere in the afternoon, slightly sooner or later
according to the season.
Just for fun, on last summer, I took advantage of the yearly shutdown of
the 19.58 kHz GBZ Anthorn to took a "photo" of the 3-D spectogram of the
18 ==> 24 kHz zoo, that allowed a more beautiful picture of NWC Harold E.
Holt. You can have a look on it on the Jean-Pierre Mere / F1AFJ site,
thanks to him, which is hosting my VLF data, more exactly on :
http://jpmere.online.fr/incoming/f5yg/2009/07/NWC3d.gif
You will see NWC just emerging from the noise around 1500 UTC, then
gathering strength to rush towards heaven !
The other stations are the more trivial ones haunting this somewhat
secluded area, ICV Tavolara Island on 20.27 kHz, GQD Skelton on 22.1 kHz,
and, higher, Rosnay (Le Blanc) HWU.
Fascinating stuff!
Indeed !
Friendly yours !
J-P f5yg
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