Here is a spectrogram showing the 2970 Hz signal in 3.8 mHz as received
on the tree. The carrier reached an S/N of 27.57 dB in 166.7 uHz, -10.22
dB in 1Hz, -44.20 dB in 2.5kHz
73, Stefan
Am 01.09.2018 21:33, schrieb DK7FC:
Hi Markus and Paul,
Thanks for the efforts to watch out for the signal. I'm surprised that
the signal appears at Bielefeld since the 900m ground loop antenna in
JN39WI does not really point there, it rather points directly to Paul.
No trace in Todmorden? The gain of the loop is on your side! :-)
Markus, can you decode a '*' message from the exportet FFT data? 8 dB
in 167 uHz could be fine.
It was an interesting test of the new equipment. After the 100 minutes
at 265 W power consumption from the battery, the display still shows
70 % rest capacity for the next experiment which will follow soon. The
H bridge PA stays cool during the transmission. The PA can work from
30 Hz to 9 kHz. I could add another 3 dB by running more power. Since
i have to 'wait' during the transmission i can't run a 24 hour
transmission :-) It will always be less than 2 hours but i can run
more power so we can search for the signal in a higher bandwidth which
could be an advantage.
73, Stefan
Am 01.09.2018 20:33, schrieb Paul Nicholson:
After cycling through some combinations of filter and
blanker settings, Bielefeld (DL4YHF) is now showing
http://abelian.org/vlf/tmp/180901b.gif
About 3.8 sigma, needs another couple of dB.
--
Paul Nicholson
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2970_3.8mHz.jpg
Description: JPEG image
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