Re: VLF: Tonite...

[Markus Vester <markusvester@aol.com>]

Good decode again. The signal was strong enough to produce a visible haze around 8270.1 Hz on my grabber. The EbNaut phase dots (referenced to DCF77) seem to show a small step upward around sunrise ~ 5:45 UT.

Best 73,
Markus

ebnaut-rx V0.5
input file 03050523.wav
sample rate 0.514405 per second
rx frequency 8270
file start time 2017-03-05 00:58:21.200
polynomial 16K21A
crc size 16
number of chars 8
block size 64
symbol period 30.000
number of symbols 1344
list length 20000
start offset -5293.000
freq offset 0.100000
cores 2
padded 5293.495 seconds at start
padded 3174.542 seconds at end
initial reference phase -28.7
---------------------------------------------
found xxx xxxx
list rank 0
reference phase    0    0    0    0
carrier RMS 2.591e+004 noise RMS 1.065e+003
carrier S/N 27.73 dB in 24.8 uHz
carrier Es/N0 -3.56 dB
carrier Eb/N0 11.14 dB
info bit period 884.21 seconds
symbol error rate 403/1344 = 29.985 %
Es/N0 from symbol errors -8.6 dB
Eb/N0 from symbol errors 6.1 dB
Shannon capacity 63.2 bits/hour
Shannon efficiency 6.4 %
symbols file 03050523-symbols.csv
elapsed 7 seconds
---------------------------------------------
found xxx xxxx
list rank 0
reference phase   30   30    0    0
carrier RMS 2.649e+004 noise RMS 1.065e+003
carrier S/N 27.92 dB in 24.8 uHz
carrier Es/N0 -3.37 dB
carrier Eb/N0 11.33 dB
info bit period 884.21 seconds
symbol error rate 391/1344 = 29.092 %
Es/N0 from symbol errors -8.1 dB
Eb/N0 from symbol errors 6.6 dB
Shannon capacity 65.6 bits/hour
Shannon efficiency 6.2 %
symbols file 03050523-symbols.csv
elapsed 85 seconds



-----Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: So, 5. Mrz 2017 0:39
Betreff: Re: VLF: Tonite...

...restartet 23:30 UTC, will be a day/night transmission...
73

Am 04.03.2017 17:23, schrieb DK7FC:

Hi Eddie,

I see you can even see me in 424 uHz. You must have a very good antenna design ;-)
I'm also impressed by your results over that 742 km path, http://no.nonsense.ee/qth/map.html?qth=IO92NG&from=JN49IK00


Now, time for a next message! I'm still trying to pass more characters than 7 to the path to Moscow. Hopefully the will be some more OMs joining in.
Let's try 8, again:

f = 8270.100000 Hz
Start time: Saturday 04.Mar.2017   18:00:00
Symbol period: 30 s
Characters: 8
CRC bits: 16
Coding 16K21A
Duration: 11h, 12m, 0s
Antenna current: 700 mA

The signal is more stable, sharper now, see attachments (spectrograms with equal brightness/contrast settings). It has shown 1 dB stronger at IK1QFK in the morning. But probably that was propagation.
The wx forecast announces some rain. Hopefully it won't trigger the safety limit which is set to - 30 mA.

Reports welcome.


73, Stefan


Am 04.03.2017 11:25, schrieb g3zjo:

On 04/03/2017 10:10, Markus Vester wrote:

Hi Eddie, your grabber looks fine now, showing good traces from DK7FC.

Yes indeed, after a computer restart the Grabs were still there, timed when I crashed the computer, and they updated.
I have disabled uploads from the new blank SpecLab instances so the present ones will remain for a time.

BTW Last week I've migrated all my lazily-made Dropbox\Public grabbers to "proper" FTP uploads to the DARC server. Now considering withdrawing from Drpbox alltogether.

:-):-) I am following in your footsteps, although I am / was going to try FTP uploads from the Dropbox folder, in this way I would have a remote view from another computer of the Captures on the shack machine. Experimenting with a simple / lazy Grabber.

73 Eddie G3ZJO