Thanks for the S/N and BW plots, Stefan. They are revealing.
Will resume carrier now but happy to EbNaut on request.
73
Joe
On Mon, 21 May 2018, DK7FC wrote:
Hi Joe,
Pity. There was another message showing up. It was '@' but i had doubts
although the Eb/N0 was shown higher.
Now i'm back on the N-S antenna for Riccardos transmission. We can try again
in some days.
You see i need two antennas on the tree, or better 3!
Thanks for the experiment.
73, Stefan
Am 21.05.2018 14:34, schrieb [email protected]:
Hi Stefan,
Sorry, that's not it. The WX was wet last night and there was some
arcing which probably didn't help. The WX will be dry so let's
try again tonight and if that fails, we can try your settings.
Thanks for monitoring.
73
Joe
On Mon, 21 May 2018, DK7FC wrote:
Hello Joe,
I think i've got your message. But it is very weak, quite close to the
limit. The message is 'T', right?
From: vtcat -T2018-05-20_23:00,+7h Joe1ch.vt | vtraw -oa | ./iqnorm2 |
ebnaut -dp16K23A -N1 -S30 -k21 -c4 -r1 -L534849 -PS -f9 -v
i got as the best result:
phase 58 150 120 120 90
found rank 223512 ber 4.4898e-01 Eb/N0 0.6 M -3.561031494e+02 ph 58
150,120,120,90 [T]
carrier phase: 17.6 deg
carrier Eb/N0: 0.2 dB
carrier Es/N0: -21.21 dB
carrier S/N: 7.73 dB in 42.5 uHz, -35.98 dB in 1Hz, -69.96 dB in 2.5kHz
73, Stefan
Am 20.05.2018 17:33, schrieb [email protected]:
Hi Stefan and thank-you for the encouraging report. At the moment, all
is set (I hope!) for:
One character, 8.2700075 kHz,
2300, 1100 utc, 16K23A, CRC-21,
784 symbols, 30 seconds
It will take some time to change to the settings you suggested -- we can
try this after.
73 and tnx agn
Joe
On Sun, 20 May 2018, DK7FC wrote:
Hello Joe,
I searched for your last nights carrier in my recordings and found an
impressive SNR, totally unexpected for this time in the year. See
attachment.
The carrier reaches 10.97 dB S/N in 39.7 uHz when starting at 23 UTC.
This would easily decode a 1 char message.
I remember we tried some weeks ago without success, even when stacking
several days or nights.
Do we want to try again to detect a 1 char message?
Based on the last nights results i would suggest: 1 char, 16K21A,
CRC26, Start 23:00 UTC, 30 sec symbols
HW? :-)
73, Stefan
Am 18.05.2018 01:54, schrieb [email protected]:
Hello VLF
The TX is QRV 8270.0075 Hz 10 uW ERP unmodulated carrier.
73
Joe VO1NA
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