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Hi Luis
Good Luck.
Keep trying, don't give up. Consider it a gift to be twice as far
away, more challenge :-)
73 Eddie
On 28/11/2017 12:13, VIGILANT Luis
Fernández wrote:
Congratulations
Eddie
A nice and clear trace in your spectrogram
I’m still digging in to get a trace. Got some
pixels at 179uHz but nothing clear enough
I have almost double distance to Stefan than
you. Rx is similar but noise here is high
Set another spectrogram to 47uHz 100 minutes
per pixel but will take time to get results
https://ea5dom.ure.es/grabber/index.html
73 de Luis
EA5DOM
Hi Dave
Stefan's e-probe design for 8.7kHz antenna and sound card RX.
The BPF in the probe has quite some cut off outside sub 9kHz
but maybe that's good due to the adjacent big boys.
73 Eddie
On 28/11/2017 10:58, Dave wrote:
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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