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
|
