Hi Stefan, Ah yes of course, for some reason I was not thinking of lightning
...even at this time of year ! There is always a certain amount of it within
3000km so out of area noise is irrelevant.
Keep up the good (and interesting) work :-))
Alan
G3NYK
----- Original Message -----
From: "DK7FC" <[email protected]>
To: <[email protected]>
Sent: Wednesday, August 30, 2017 1:47 PM
Subject: Re: VLF: Carrier on 4470.005 Hz! - EbNaut test
Hi Alan,
Am 30.08.2017 13:46, schrieb Alan Melia:
Hi Stefan does EbNaut give you some kind of S/N for these frequencies??
Yes. Paul can give you (us) these values since he is the receive station
:-)
. I am interested to know whether the noise reduces with a depressed Dst
index or whether the S/N is sensibly the same in the far-field.
From my observations, the SNR is dominated by the QRN, lightning activity.
In this frequency range, the local lightnings (< 3000 km) begin to play a
more dominant role than on 8.27 kHz. But i'm just a band observer, not a
paper reader...
73, Stefan
Alan
G3NYK
----- Original Message ----- From: "DK7FC" <[email protected]>
To: <[email protected]>
Sent: Wednesday, August 30, 2017 12:32 PM
Subject: Re: VLF: Carrier on 4470.005 Hz! - EbNaut test
Hi Paul,
Thanks for the interesting overview. Do you have phase informations for
each day too? It was interesting to see the daily phase variations
during our stacking attempts in last winter, it was the 'TEST' message
from 11th to 17th November.
BTW if we manage to get a decode, then it will be the (new) lowest
frequency where amateurs managed to send a message from DL to UK, i.e.
an international one way contact!
Yesterday i saw that it will be a good day (low QRN), today looks even
better, so far.
73, Stefan
Am 29.08.2017 23:34, schrieb Paul Nicholson:
Still no decode, not even with known phase.
Daily Eb/N0:
23rd -6.2 dB
24th -16.8 dB
25th -9.2 dB
26th -10.3 dB
27th -9.8 dB
28th -15.8 dB
29th -8.0 dB
Combined -2.5 dB leaving out 24th and 28th.
> If the message would be unknown, could you still fin out that
> it is better to leave the 24th out, just by checking the noise
> background relative to the other days or the days where i sent
> the carrier?
Yes I've done that in previous tests, dropping out days with a
high background. Also dropping out one day at a time, then
two. After that there are too many permutations (each with a
full phase search).
--
Paul Nicholson
--
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