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

To: [email protected]
Subject: Re: VLF: A weekend for newcomers and advanced newcomers...
From: DK7FC <[email protected]>
Date: Mon, 27 Feb 2017 12:43:06 +0100
In-reply-to: <[email protected]>
References: <CAGZ2MyYDKx5B6HSg1Z7XeoWZigvDgVS8XLT82A1aXW6ogFxFqg@mail.gmail.com> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <5F78A5280BA3412B9829C1E042E77593@AGB> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
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Hello Eddie,

I confirm the message :-)
Thanks for the feedback, always good to know the message went out as expected.

BTW it is useful to run the decode process until it is completed (= 25%,  at 30 deg steps) because there can be better results, with another phase combination which gives a better Eb/N0. The best result is always interesting because then we know how far we are from the limit...

It looks like the QRN was relatively high last night.

73, Stefan

Am 27.02.2017 09:15, schrieb g3zjo:

Good decode of the 12 Chr. message in Northampton UK IO92ng. Message XXXXXXXXXXXX PM sent to HQ for confirmation.

found XXXXXXXXXXXX
list rank 1005
reference phase   30   30   30   30
carrier RMS 4.796e-005 noise RMS 6.007e-006
carrier S/N 18.04 dB in 24.6 uHz
carrier Es/N0 -14.25 dB
carrier Eb/N0 -0.31 dB
info bit period 595.09 seconds
symbol error rate 668/1696 = 39.387 %
Es/N0 from symbol errors -14.4 dB
Eb/N0 from symbol errors -0.5 dB
Shannon capacity 8.0 bits/hour
Shannon efficiency 75.8 %
elapsed 55 seconds


On 26/02/2017 11:03, DK7FC wrote:

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.


A Walk in the Park:-)

73 Eddie G3ZJO
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