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Re: VLF: 300 mA on 8270 Hz

To: [email protected]
Subject: Re: VLF: 300 mA on 8270 Hz
From: DK7FC <[email protected]>
Date: Tue, 26 Sep 2017 13:45:08 +0200
In-reply-to: <[email protected]>
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Hello Jacek,

Many thanks. I confirm the message is coorrect :-)
920 km distance on a land path. Not so bad :-)
Usually my signal is 7.4 dB stronger. So it would have worked in a single day when using 700 mA antenna current.
The message is running a 5th time today, ending 17:32 UTC.

Whast next? I could try a longer message, maybe 25 characters 8K19A... Will think about it. Suggestions?
73, Stefan



Am 26.09.2017 13:23, schrieb Jacek Lipkowski:
On Tue, 26 Sep 2017, DK7FC wrote:

4 transmissions were done successfully.
Is there someone trying to decode it at all or is it just a lonely test?
of course people are trying to decode it :)

(message sent by email for validation, but i'm 100% sure that the message is correct)
so far this is the best i got:

found rank 6395 ber 3.9815e-01 Eb/N0 -0.7 M -3.339568750e+04 [yyyyy xxxxxx] ps [ 16 0 0 -30 -30]
carrier phase: -9.4 deg
carrier Eb/N0: -1.2 dB
carrier Es/N0: -15.20 dB
carrier S/N: 17.17 dB in 24.1 uHz, -29.00 dB in 1Hz, -62.98 dB in 2.5kHz
elapsed 1346

this has been decoded using stacked transmissions from 4 days using Paul's script (thanks Paul!).
knowing the message i will try optimise it for better Eb/N0

12 characters 16K21A is a bit challenging for most computers though.
not that much.

decoded with list length 2000000, takes about 3GB of ram. this is using an 9 year old dell e4300 laptop with 4GB ram (which is not much by todays standards). underclocked to 1.6GHz because otherwise it dies from overheating.
VY 73

Jacek / SQ5BPF






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