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Receiving DK7FC on 17 km band

In these days Stefan DK7FC is transmitting with a special license on 17470,1 Hz a CW signal. I and other Hams are trying to receive his signal.
I already received Stefan’s signal on 8 kHz with a 47 uHz waterfall grabber, now I successfully tryied also a 424 uHz grabber.
Here is an image of the signal:
VVE_vlf3
In this page http://www.ik0vve.net/?page_id=377 is possible to see my online grabber updated every 30 minutes.
To receive the transmission I’m using the MF-LF TX antenna because the whip and loop rx antennas are not installed at the moment. The antenna is connected to the sound card of the PC by a 1:1 trafo without any preamplifier.

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