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Re: VLF: This weekend...

To: <[email protected]>
Subject: Re: VLF: This weekend...
From: "Graham" <[email protected]>
Date: Sun, 19 Feb 2017 13:33:12 -0000
Importance: Normal
In-reply-to: <[email protected]>
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Your right Ed , there  are no  uk  8KHz tx permits .. Or
 
Probably as there aint one that  long  Ed  , Never  tried   OP10H  !
 
But then , The  test is  data transfer / energy supplied , so  would need  on corrected energy transfer to allow for the  50% duty cycle  ,  carrier level , either  +3 dB or x 2 time
 
Longest  non mutilated  Opera is  4 Hours, 2 hours carrier , acid test would be a  4 hour test and Eb at 4 hours at  -3 db power level over a live path .
 
results of that  test would be interesting, )
 
73-G,
 

From: g3zjo
Sent: Sunday, February 19, 2017 10:52 AM
Subject: Re: VLF: This weekend...

On 19/02/2017 07:48, DK7FC wrote:
...i forgot to enable the scheduled actions in SpecLab, so the transmission didn't start to the announced time.
Noticed that and set the new start time to 18:15 UTC, i.e. 15 min delayed...


*An urban decode in G land. Wonderful.* (You couldn't do this with OPERA 'G').

Of course all thanks and credits go to Paul, Marcus and Stefan not forgetting Wolf.

ebnaut-rx V0.6
input file C:\Comms\EbNaut\19_FEB_0005_8270.wav
sample rate 0.342935 per second
rx frequency 8270.1
file start time 2017-02-18 17:27:09.370
polynomial 16K21A
crc size 16
number of chars 7
block size 58
symbol period 30.000
number of symbols 1248
list length 20000
start offset 2882.290
freq offset 0.000000
cores 2
skipped 2881.014117 seconds to start
initial reference phase -54.6
---------------------------------------------
found 7Symbols Message
list rank 0
reference phase    0    0    0    0
carrier RMS 6.027e-005 noise RMS 5.405e-006
carrier S/N 20.95 dB in 26.7 uHz
carrier Es/N0 -10.02 dB
carrier Eb/N0 4.94 dB
info bit period 938.35 seconds
symbol error rate 427/1248 = 34.215 %
Es/N0 from symbol errors -10.8 dB
Eb/N0 from symbol errors 4.2 dB
Shannon capacity 16.4 bits/hour
Shannon efficiency 23.3 %
symbols file C:\Comms\EbNaut\19_FEB_0005_8270-symbols.csv
elapsed 8 seconds

73 Eddie G3ZJO

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