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Re: VLF: Tonite...

To: "[email protected]" <[email protected]ksheep.org>
Subject: Re: VLF: Tonite...
From: DK7FC <[email protected]>
Date: Fri, 10 Mar 2017 18:50:13 +0100
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
Hi Alex,

Yes, that's it! My congrats to you, as written in the message ;-)
8 characters on the 36 km band from Germany to Russia, with a fixed antenna, that's a thing we were dreaming of :-)

Wow and we are quite close to the limit again!
Carrier S/N 17.39 dB in 24.8 uHz, based on that value we could also try 10 characters, http://abelian.org/ebnaut/calc.php?sndb=17.39&snbws=0.000025&snmps=&code=16K21&sp=27&crc=15&nc=10&submit=Calculate
Maybe a job for the next weekend :-)

73, Stefan


Am 10.03.2017 16:21, schrieb Alex K:
Hello Stefan, VLF!
Yes!
Optimization of my receiving system yielded positive takes. Both 8-ch transmissions were successfully and quite easily decoded.
It is interesting that for transmission of March 07 of 22:30 best decode achiewed with small freq offset. Without this offset  was also successful decode but with smaller Eb/N0.
On reception only E-probe was used. I found that this setup, without Loop-ant, gives the best SNR in my environment.
Grabber is running and my next visit will at Monday.
Congrats to Stefan on his 8-char successful transmissions!

As usualy files are here:
http://rn3aus.narod.ru/ebnaut-vlf-7-9mar2017.zip 

ebnaut-rx V0.5
input file C:\EbNaut\ebnaut08_MAR_0448_8270-1pps.wav
sample rate 0.342935 per second
rx frequency 8270.1
file start time 2017-03-07 22:10:11.190
polynomial 16K21A
crc size 16
number of chars 8
block size 64
symbol period 30.000
number of symbols 1344
list length 200000
start offset 600.774
freq offset 0.000009
cores 2
skipped 600.696925 seconds to start
initial reference phase 19.0
---------------------------------------------
found CONGRATS
list rank 12
reference phase   30   30   30   30
carrier RMS 1.213e-004 noise RMS 1.783e-005
carrier S/N 16.65 dB in 24.8 uHz
carrier Es/N0 -14.63 dB
carrier Eb/N0 0.06 dB
info bit period 884.21 seconds
symbol error rate 532/1344 = 39.583 %
Es/N0 from symbol errors -14.5 dB
Eb/N0 from symbol errors 0.2 dB
Shannon capacity 5.9 bits/hour
Shannon efficiency 69.5 %
symbols file C:\EbNaut\ebnaut08_MAR_0448_8270-1pps-symbols.csv
elapsed 20 seconds

ebnaut-rx V0.5
input file C:\EbNaut\ebnaut09_MAR_2248_8270-1pps.wav
sample rate 0.342935 per second
rx frequency 8270.1
file start time 2017-03-09 16:10:11.190
polynomial 16K21A
crc size 16
number of chars 8
block size 64
symbol period 30.000
number of symbols 1344
list length 200000
start offset 6600.774
freq offset 0.000000
cores 1
skipped 6601.834167 seconds to start
initial reference phase 33.2
---------------------------------------------
found GOOD DAY
list rank 0
reference phase    0    0    0    0
carrier RMS 1.397e-004 noise RMS 1.888e-005
carrier S/N 17.39 dB in 24.8 uHz
carrier Es/N0 -13.90 dB
carrier Eb/N0 0.80 dB
info bit period 884.21 seconds
symbol error rate 546/1344 = 40.625 %
Es/N0 from symbol errors -15.5 dB
Eb/N0 from symbol errors -0.8 dB
Shannon capacity 6.9 bits/hour
Shannon efficiency 58.9 %
symbols file C:\EbNaut\ebnaut09_MAR_2248_8270-1pps-symbols.csv
elapsed 11 seconds



Пятница, 10 марта 2017, 16:59 +03:00 от Paul Nicholson <[email protected]>:


Stefan wrote:

 > same parameters as below, started 18 UTC.

Another solid transmission:

  carrier Eb/N0: 10.6 dB
  carrier S/N: 27.20 dB in 24.8 uHz

Peaking at offset +0.37 seconds.

Eddie wrote:

 > carrier Eb/N0 5.30 dB
 > carrier S/N 21.89 dB in 24.8 uHz

Here in the E-field

  carrier Eb/N0: 3.9 dB
  carrier S/N: 20.47 dB in 24.8 uHz

--
Paul Nicholson
--



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