Hi Stefan
I am back at the HQTH and will be monitoring for you. What time will you
start the resonating tests? if needed I will leave my Grabber on
overnight. I cannot guarantee to be up at 0300 with the bird song as I
was this morning:-)
BTW I am monitoring 136kHz Views on my Grabber now.
73 Eddie G3ZJO
On 09/06/2011 20:09, Stefan Schäfer wrote:
VLF,
Tomorrow i plan to do first tests on 8970 Hz on my fixed antenna in
Heidelberg,
http://no.nonsense.ee/qthmap/?qth=JN49IK00WG&from=jn49ik00WD It is
about 30m up.
I'll start doing some resonating tests and may come on air in the
afternoon. The small PA (max. 300W) will be used in this first test
since it is easier to manage. Maybe the resonance will be some kHz
higher but i hope to come down into the Dreamers Band (TM).
I expect to be visible on "local" grabbers like DF6NM, OE3GHB and
OK2BVG. If all works well i plan to transmit a longer dash, maybe 6000
seconds and later a short message in DFCW-600, like "K" or so, just
for the proof and to get a first impression about the efficiency of
this antenna.
I had the idea to buy some flexible aluminium tube to form a toroid
that will be placed on the top of the coil. Tis reduces the maximum E
field and adds some C, that might be needed to come down to 8970 Hz...
Of course all this depends on the absence of rain but now i don't need
wind! Therefore, the signals will be about 20 dB lower, probably.
The signal will be overload my grabber
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html
that is in about 20 m (!) distance. Hopefully it gets not damaged due
to several 10 kV on the wire.
Is there someone who will watch for that signal?
Reports would be very apprechiated!
73, CU, Stefan/DK7FC
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