Re: VLF: A weekend for newcomers and advanced newcomers...

[Jacek Lipkowski <sq5bpf@lipkowski.org>]

Decoded fine the 20170226 transmission (text send offline to Stefan). the 
Eb/N0 is small probably because of some problems with the receiver (it 
says that 9984s, or almost 3h were padded), probably because i was messing 
with the gps reference signal.
padded 9984.267 seconds at end
initial reference phase -17.4 amplitude 3.223e-01
prep [  0    0    0    0    0]
found rank 0 ber 4.5991e-01 Eb/N0 -9.0 M -1.204406548e+01 [XXXXXXXXXXX] ps [  0 
   0    0    0    0]
carrier phase: -14.9
carrier Eb/N0: 3.9
carrier S/N: 22.24 dB in 24.6 uHz
elapsed 41

VY 73

Jacek / SQ5BPF


On Sun, 26 Feb 2017, DK7FC wrote:

> Date: Sun, 26 Feb 2017 12:03:40 +0100
> From: DK7FC <selberdenken@posteo.de>
> Reply-To: rsgb_lf_group@blacksheep.org
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: VLF: A weekend for newcomers and advanced newcomers...
>
> Thanks Eddie, Jacek and Paul for the decode.
> The message is correct :-)
>
> Alex/RN3AUS will have to search for 3 EbNaut messages now, 8ch, 10ch and 4 ch 
> :-)
>
> The normal carrier on 8270.005 Hz is still running. It will stay on the air 
> until the EbNaut message
> begins.
>
> The WX forecast looks good so i will try another EbNaut transmission. 12 
> characters, a critical
> value on the path to Moscow but who knows, maybe the QRN is low... We will come 
> quite close to the
> limit!
>
> f = 8270.100000 Hz
> Start time: Sunday 26.Feb.2017   18:00:00 UTC
> Symbol period: 24 s
> Characters: 12
> CRC bits: 14
> Coding 16K21A
> Duration: 8h, 32m, 0s
> Antenna current: 700 mA
>
> This is beyond the decode skills of my PC but i assume that many of you will 
> have a better system
> available. Alex has 8 GB RAM at least so it will be possible and i stay at 
> 16K21A.
>
>
> 73, GL, Stefan
>
>
>
>
> Am 26.02.2017 10:16, schrieb g3zjo:
>
>       Nice decode of Stefan's Transmission, application for confirmation sent 
> by PM.
>
>       found XXXX
>       list rank 0
>       reference phase    0    0    0    0
>       carrier RMS 5.550e-005 noise RMS 7.109e-006
>       carrier S/N 17.85 dB in 32.6 uHz
>       carrier Es/N0 -12.25 dB
>       carrier Eb/N0 4.27 dB
>       info bit period 1347.37 seconds
>       symbol error rate 392/1024 = 38.281 %
>       Es/N0 from symbol errors -13.5 dB
>       Eb/N0 from symbol errors 3.0 dB
>       Shannon capacity 10.0 bits/hour
>       Shannon efficiency 26.7 %
>       elapsed 5 seconds
>
>       73 Eddie G3ZJO
>
>
>                         f = 8270.100000 Hz
>                         Start time: Saturday 25.Feb.2017   20:00:00 UTC
>                         Symbol period: 30 s
>                         Characters: 4
>                         CRC bits: 20
>                         Coding 16K21A
>                         Duration: 8h, 32m, 0s
>                         Antenna current: 700 mA
>
>                         73, Stefan