PPS: Sorry, i was wrong. Stacking 2 days means (up to) 3 dB. So we need
16 days for 12 dB. About 8 months to reach DL0AO. That's maybe a bit
much. I need more power...
Am 28.08.2017 12:29, schrieb DK7FC:
PS: Maybe even Paul can find something. I remember last year we tried
to see a trace on Paul's side, on 2970 Hz when i run 3 kV for 7 weeks
or so. But now we saw and know the propagation challenge on 2970 Hz /
101 km. On the 309 km band, the ERP is much lower (abt 27 dB) but
probably we are far away from these dips shown in the plots provided by
Jim.
Am 28.08.2017 12:17, schrieb DK7FC:
It would be interesting to analyse the different VLF and ULF bands to
see where the daily diurnal phase is most constant. That would limit
the number of stackable days to get better results. We never tried to
stack more than 9 days (that was on 2970 Hz) if i remember correctly.
One day we may need to do that on 970 Hz! I'm working on the
next QRO step on that 309 km band! I think i will need +12 dB to get
good results at 50 km distance. To reach DL0AO would maybe require
another 12 dB, which will not be possible. All in all i may rise the
power by 15 dB relative to now. Then stacking of 4 days would help to
see something at DL0AO however! Most exciting!
Hmmm, now, when thinking about that: would it maybe work to stack 16
days to see a trace at DL0 AO, now with the 5 kV (3 nW ERP)? That's
just about 2 weeks! :-) I got 15 dB in 47 uHz in 27.2 km distance with
an E field antenna, also during noisy days.
Markus, what do you think?
Maybe, can i ask for a 424 uHz spectrogram from W and EW? That would
give an impression on the diurnal noise and daily variations.
I could set up my modified mains transformer to run 15 mA antenna
current at 970.005 Hz for several weeks! Maybe we will see the
impossible, beyond our garden fences!
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