Hi,
What antenna and RX are you using for VLF,
Eddie?
73, Dave G3WCB IO80EI
Left
it on overnight.
Would
you like it on 24/7, I see diurnal variations similar to Marcus but more
pronounced due to my lower signal strength.
73
Eddie
On 27/11/2017 20:30, g3zjo wrote:
Hi
Stefan
I
didn't quite believe what I was reading you may like to take a look at my
Grabber.
http://www.qsl.net/g3zjo/vlfgrabber
73
Eddie
On 27/11/2017 09:34, DK7FC wrote:
Hello Markus,
thanks for the feedback. Wonderful, now it is 30 dB in 424 uHz. DL0AO could run
a 3.8 mHz '600' RDF spectrogram and a phase and signal level plot, so we could
see propagation effects much better.
You could already see QRSS-60 from me! I will try that soon.
The carrier is still on the air. It will run the whole day and night...
73, Stefan
Am 26.11.2017 15:59, schrieb Markus Vester:
Hi VLF,
Since 23 UTC a 700 mA carrier is running on 17.4701 kHz!
It is a little surprise to the VLF community i think ;-)
Legal? Yes: http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/17,47kHz_Sonderlizenz.jpg
Actually the document has 3 pages but the other ones are no so relevant.
My ERP is limited to 5 mW. I did not request more because more isn't possible
anyway with this antenna.
I wound a big single layer coil with 0.5 mm enameled wire on a PVC tube with
315 mm outher diameter.
0.7 A is just a first careful step. The coil is designed to hold 1.5 A 'key
down'.
The carrier will run the whole night and even tomorrow at daytime.
Worldwide reports are welcome ;-)
It is not sub-9-kHz but still VLF, the 17 km band!! So give it chance :-)
The tree has still some solar power to stream the signal from the EW loop down
to the city, so there is a feedback spectrogram at
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html
73, Stefan
PS: I still can hear that tone of the coil. It is terrible! Be happy when you
are older than me!
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