LF: Re[2]: LF: EbNaut test at 8270.00332 from JN64bw

[Alex K <rn3aus@MAIL.ru>]

Hello Riccardo, VLF!

Looks like I have something!

After weighted stacking of 3 nights of 3 char transmissions EbNaut software produce decode :

ebnaut-rx V0.7a
input file C:\EbNaut\IW4DXW\sum3charweighted.wav
sample rate 0.342935 per second
rx frequency 8270.1
file start time 2017-12-16 20:32:19.690
polynomial 16K21A
crc size 24
number of chars 3
block size 42
symbol period 30.000
number of symbols 992
list length 20000000
start offset 3472.274
freq offset -0.096681
cores 1
skipped 3472.961348 seconds to start
initial reference phase 28.1
---------------------------------------------
found QSY
list rank 14946658
reference phase -150 -150 -150 -150
carrier S/N 10.41 dB in 33.6 uHz, -34.33 dB in 1Hz, -68.31 dB in 2.5kHz
carrier Es/N0 -19.56 dB
carrier Eb/N0 -1.92 dB
info bit period 1740.35 seconds
symbol error rate 428/992 = 43.145 %
Es/N0 from symbol errors -18.2 dB
Eb/N0 from symbol errors -0.6 dB
Shannon capacity 1.9 bits/hour
Shannon efficiency 108.5 %
symbols file C:\EbNaut\IW4DXW\sum3charweighted-symbols.csv
elapsed 1396 seconds
-------------------

Maybe decode is true? 

PS: stacking of 2-char transmissions give me decode "JA".  And also many other decodes like "46", "2+"... 

73 de Rn3aus / Alex 

Воскресенье, 17 декабря 2017, 0:31 +03:00 от Riccardo Zoli <riccardozoli80@gmail.com>:

Hi VLF,

I'm ready for another transmission:

f = 8270.00332 Hz
Start time: 21:30:00 UTC
Symbol period: 30 s
Characters: 3 (repeated)
CRC bits: 24
Coding 16K21A
Duration: 8h,16min
Antenna current: 395 mA

...thanks again for reports.

All the best

73 de Riccardo IW4DXW

Il 15/Dic/2017 23:21, "Riccardo Zoli" <riccardozoli80@gmail.com> ha scritto:

Hi Paul, Stefan, VLF

OK, Paul, thanks again for reports!

It's raining here this evening and I'm QRT.

Tomorrow I'll try again with same message to improve stacking.

Yes, Stefan. OK, I'll try also a much longer transmission. I have got some problems on aerial these nights due to corona effect. Yesterday, I installed two ceramic insulators on each anchor point and last night I had no problem with about 400mA.

I notice that coil under forced ventilation

it's much more efficient.

All the best

73 de Riccardo IW4DXW

Il 15/Dic/2017 12:24, "Paul Nicholson" <vlf0403@abelian.org> ha scritto:

Riccardo wrote:

> f = 8270.00332 Hz
> Start time: 21:30:00 UTC
> Symbol period: 30 s
> Characters: 3 (repeated)
> CRC bits: 24
> Coding 16K21A

 Todmorden: Decoded correctly, Eb/N0 = 0.0 dB, -32.4 dB in 1Hz.
            BER 38.8%, rank 262772.  Ref phase -30 -30 0 0
            Constant ref phase is 0.1 dB weaker.

 Bielefeld: No decode, Eb/N0 = -4.6 dB

 Cumiana:   No decode, Eb/N0 = -3.7 dB

 Warsaw:    No decode, Eb/N0 = -8.7 dB

Phase repeatability:

 Todmorden  13/14:    35.7 deg     14/15:   19.1 deg
 Bielefeld  13/14:   161.9 deg     14/15:  103.1 deg
 Cumiana    13/14:  -116.0 deg     14/15:  -95.4 deg

Stacking the two nights at Cumiana gives Eb/N0 = -1.5 dB,
still too weak to decode.

Reception worse here last night but better at the other sites.
Quite a lot of rain/snow static last night on the E-field antenna.

--
Paul Nicholson
--

IW4DXW-3char-QSY.png
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