Nothing seen here on a 2nd PC receiving the raw signal from VLF6
with a higher resolution spectrogram, but that's no surprise with
the recent QRN / thunderstorm activity.
Unfortunately the low-power netbook that streams VLF6 to Paul's
server is too slow for running a second SL instance. And for the VLF
audio stream, I don't want to turn on the noiseblanker before the
Vorbis encoder, because this would make listening to the stream very
unpleasant.
But keep fingers crossed, maybe the 191 km wavelength signal gets
close to the '2 lambda' distance..
Cheers,
Wolf .
On 25.04.2018 22:05, DK7FC wrote:
ULF,
The system changes have been done now. The carrier was off again
between 17:43...19:00 UTC.
From now on there will be no significant ( > 1 min)
interruptions
any more.
The carrier can run up to 3 weeks, depending on the feedback.
Possible
known RX stations are DL0AO, DL4YHF, Paul and Renato(vlf.it).
73, Stefan
Am 25.04.2018 13:56, schrieb DK7FC:
ULF,
Unfortunately i forgot to remove the stop command from the last
day, so
the carrier stopped again at 10:30 UTC. It is back since 11:50
UTC.
Just a note for those few who try to watch out for the signal.
73, Stefan
Am 25.04.2018 11:04, schrieb DK7FC:
ULF,
After 9 hours of work the carrier is now back since 01:00 UTC.
I'm now
running the actual target level of 56 mA, so the
signal should
be 6.3 dB stronger now.
Eventually i'll have to do some worke work tomorrow but maybe
not.
The carrier will stay on the air for a few days without
interruptions
if all works well!
Reports welcome :-)
73, Stefan
PS: Forgot to send the message last night (morning actually),
must have
been tired ;-)
Am 24.04.2018 10:49, schrieb DK7FC:
Hello ULF friends,
I just opened up a new band by starting some activity on 1570
Hz ! It is the 191 km band! :-)
Since 8 UTC a carrier is running at 1570.01 Hz. Soon the
first trace
will appear on a spectrogram from my tree which is in 3.5 km
distance
from the transmitter.
See the developing trace at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html
The spectrogram scrolls with 10 minutes/pixel.
The carrier will stay on the air for 2.5 hours. It is just a
first
test. So far the antenna current is just 27 mA but tonite
i'll try to
reach the target level of 58 mA which means 12 kV again
acros the
special iron cored coil. This will mean about 120 nW ERP
then.
DL0AO is already watching the band. I hope to be received by
Paul and
at the reomte site of DL4YHF. I'm not planning to do /p RX
experiments
on that band, just focusing on these 3 RX stations.
73, Stefan
|
|
