Hi all,
It's a deep summer hole this year it seems :-)
Well, i've stared a 4.1 uHz per FFT bin spectrogram in SpecLab. Probably
the slowest spectrogram in SL ever? ;-)
It took about 3 days until the first pixel/spectrum appeared. The scroll
rate is 1000 minutes / pixel. Time stamps are "MMM" :-)
Look at the spectrum peak of the signal, it's right on the frequency and
quite sharp, proofing a good stability of RX, TX and path....
The signal is on the air now since 2 weeks!
73 all, Stefan
PS: +33 C here...
Am 08.07.2016 14:16, schrieb DK7FC:
Hi Paul, ULF,
I just remember these curves, see attachent.
Even on our path, the 101 km band seems to be not the easiest place to
be :-) There could be a 20 dB disadvantage even on our short path. It
doesn't matter, i will simply transmit 100 times as long :-)
Once you got my peak, you can easier optimise the settings and we can
do calculations and estimations...
I have completed the first stack (1 of 8) of my new coil intedned to
generate 40 kV at 2.97 kHz. It has 350 mH, the loss is 107 Ohm at 2970
Hz. It can handle 350 mA antenna current without problems. For a HV
test i need the PA which is in use now :-)
Images:https://dl.dropboxusercontent.com/u/19882028/ULF/20160708_140755.jpg
and https://dl.dropboxusercontent.com/u/19882028/ULF/20160708_140728.jpg
73, Stefan
Am 06.07.2016 08:48, schrieb Paul Nicholson:
Stefan wrote:
> The carrier is on the air since 9 days now, without
> an interruption.
Nothing is visible, not even the beginning of a peak at 2970,
down to bandwidths of 1.36 uHz.
I continue to experiment with the settings of filters and
sferic blanker. The noise floor is too high, averaging
0.023 fT in 1.36 uHz even after blanking the noisy periods.
It should be a lot lower than that. If I can fix that problem,
we may see the signal appear.
--
Paul Nicholson
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