Hello Paul, ULF,
OK, no trace so far on your side. But now you have some first data from
Wolf, to find optimised filter/blanker settings that can be applied to
your own recording of my signal. Are you working on that to find
something?
After the detection in 303 km it is now clear that the 101 km wave
propagates at least over that distance, and not to bad!
Maybe it is worth to check if you can extract a peak from your E field
antenna only? Also it would be interesting to get some propagation /
phase stability informations over the 3 wavelength distance, i should
run a 24 hour transmission...
There was some confusion because i didn't strictly hold my announced
transmission plan, mostly unintended. To make it clear, i transmitted
last friday the 20th, from 8...20 UTC, i.e. 12 hours on 2970.000 Hz
exacty. Then on saturday the 21th, i transmitted on 8...17 UTC, also on
2970.000 Hz.
Due to the unexpected higher QRN levels i increased the antenna current
from 150 mA to 160 mA but that was after the carrier transmission. It
was just for getting a higher likelyhood to decode my own EbNaut
transmission in 140 km distance.
Last night i announced to transmit again on 2970 Hz today but in the
morning i saw it was snowing so i decided not to transmit because i
don't want to risk anything with this coil in the moment.
Now, some questions:
- What do YOU need to get a first trace of my signal in the UK?
I assume more carriers on 2970.000 Hz that you can combine with the
energy radiated on this frequency so far, right?
- If you say the S/N is 15.9 dB in a 9 hour integration (30.86 uHz) on
Wolf's receiver in 303.8 km, that would mean i could try send my
callsign or any other 5 character message in EbNaut within just one
day!!!!!!!!!!!!!!!??
Your signal calculator suggests for example:
http://abelian.org/ebnaut/calc.php?sndb=15.9&snbws=&snmps=32400&code=16K25&sp=30&crc=16&nc=5&submit=Calculate
Would you do the decode work for me if i try to leave my call
over 3 wavelengths on ULF? It is one of my biggest goals to make that
distance!
I could start tomorrow!
----
Now it is mostly cold a dry outside so i would like to try as many
experiments on 2970 Hz running 150/160 mA as possible. The biggest goal
in reach for me on that band is to leave a message on your side, in 8.8
wavelengths distance. And now the QRN is very low. So it is the time to
use i think...
73, Stefan
Am 22.01.2017 17:42, schrieb Paul Nicholson:
A six
sigma detection of DK7FC at DL4YHF's VLF rx at Bielefeld.
A record distance of 303.8 km.
http://abelian.org/vlf/tmp/170121a.png
S/N is 15.9 dB in the 9 hour integration. The signal has been
through a stage of vorbis compression/decompression.
This is the first time I've found Stefan's signal at Bielefeld.
Not a trace of the signal at Cumiana or Todmorden.
--
Paul Nicholson
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