Hello Markus, VLF,
Now there is a 28 uHz Spectrogram on my grabber,
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html
Scroll rate is 2 hours per pixel.
You can see my own carrier on 4470.005 Hz which is running between the
EbNaut messages.
Currently the EbNaut message is running for the 3rd time.
Yesterday it was quite noisy again. I'm curious to see if Paul can
decode the message with 3 stacked days.
I find that most fascinating! Stacking daily transmissions is only
possible on VLF (or ULF/ELF probably?). So everyone could try to
transmit there, even with an 'average' LF transmit antenna. The coil
and the stable frequency generation seems to be the problem however.
Actually we need some more public relations, more spread information
and motivation for potential VLF newcomers. As soon as a critical
number of TX and RX stations has been overcome, it can be a
self-running movement. The RX capabilities of DL0AO are certainly a new
valuable contribution to the RX sites.
As soon as the message is decoded on Pauls side, i want to rise the
antenna current to 170 mA (~ + 1 dB) and try a longer message, maybe 20
characters or so. There is enough time to run the experiment now...
73, Stefan
Am 21.08.2017 15:06, schrieb Markus Vester:
Thanks
Stefan! Distance between DF6NM and DL0AO is 48 km.
Yes a slow window from your tree might possibly receive my signal on
4470, albeit marginally, with perhaps 10 to 12 dB in 31
uHz. Unfortunately I won't be able to do long daytime transmissions
before the next weekend.
Best 73,
Markus
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