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Date: Mon, 30 Jan 2017 15:08:18 +0100
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: ULF: EbNaut over 3 wavelengths on ULF
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Status: RO

Hi Paul, ULF,

Am 29.01.2017 18:26, schrieb Paul Nicholson:
>
> Stefan wrote:
>
> > From the known decoded EbNaut messages, what was the SNR at
> > Renato or on your side?
>
> Nothing detectable here or at Cumiana so I can't answer the
> question of how many days need stacking.  Until there is some
> glimpse of a signal, it is completely unknown.  I can only
> estimate a lower limit.
Yes, we don't even know if the night could be better than the day.

> Between 2016-06-26 13:00 and 2016-07-31 08:00 you transmitted
> carrier with 30mA antenna current.  I received and stacked
> over 34 days of carrier (about 15dB stacking gain) with no
> sign of signal.  You estimated 100nW ERP.
>
> Now you can do 150mA current - about 14dB gain over July's
> signal.  Plus, improvements here to filtering and blanking
> may add 2 or 3dB more.
Plus the lower QRN!

> We can in two days exceed the stacked signal for the whole
> of July.  Also with your higher ERP I can see the signal each
> day at Bielefeld to check the phase.
Yes, Wolf's RX is a nice feedback channel for the daily tests.
> I think we should try some daytime carrier repeats.  Already we
> know there is nothing after 2 days so we will need at least
> 4 days to get a hint of signal and then at least 10 days to
> collect enough signal for some measurements.  It is surely
> certain that we will eventually pick up the signal after
> enough days.
Yes, more adding is the only way to find out what happens between QRB 
of  3 and 5 lambda, and 8.8 lambda!

I assume you have saved the data from Cumiana to add the signals that i 
transmitted so far at 150 mA?
That was:
Jan, 20th, 8...20:00 UTC 2970.000 Hz
Jan, 21th, 8...17:00 UTC 2970.000 Hz + 17...20 UTC 269.9975 Hz
Jan, 22th, 8...14:45:20 UTC 2970.000 Hz, reconstructed carrier of EbNaut 
(8K19A, CRC16, 7ch, 40s, message: 'F/DK7FC')
Jan, 24th, 8... 16:00 UTC 2970.000 Hz, reconstructed carrier of EbNaut 
(16K25A, CRC18, 3ch, 30s, message 'ULF')
Jan, 25th, 7... 16:20 UTC, 2970.000 Hz, reconstructed carrier of EbNaut 
(16K25A, CRC16, 5ch, 30s, message 'DK7FC')

That's already 42 hours in daylight (8...17 UTC), a peak shown in 6.6 
uHz. And there is nothing at all?
Can we assume that Renato's RX has the full sensitivity on 2970 Hz? The 
sferics always appear very strong. I clearly expected to see Markus on 
8270 Hz in JN38OO, even with my resonated antenna, because the sferics 
still looked so strong. But there was not a trace at all! It is hard to 
imagine that Wolf can decode the messages 'easily' and Renato can't seea 
faint peak. But maybe, that's how it is. I should do a holiday weekend 
again, in 4 lambda distance...

If the wx permits, i will run a carrier tomorrow on 2970.000 Hz between 
8...17 UTC.

73, Stefan