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Re: VLF: 6470...

To: [email protected]
Subject: Re: VLF: 6470...
From: Jacek Lipkowski <[email protected]>
Date: Mon, 8 May 2017 08:36:38 +0200 (CEST)
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Alpine 2.11 (DEB 23 2013-08-11)
I think i've decoded the 06.May.2017   18:00:00 UTC 6470.1Hz transmission, but 2-bit crc passes multiple decodes, most probable message:
found rank 1 ber 4.1912e-01 Eb/N0 -0.0 M -2.227154732e+00 [xx] ps [ 75
-150 -120 -150 -120]
carrier phase: 8.4 deg
carrier Eb/N0: -2.3 dB
carrier Es/N0: -19.08 dB
carrier S/N: 8.28 dB in 30.6 uHz, -36.86 dB in 1Hz, -70.84 dB in 2.5kHz
elapsed 256

but it might be also this:

found rank 0 ber 4.6507e-01 Eb/N0 -7.3 M -2.034600258e+00 [yy] ps [  5  150  
150  150  150]
carrier phase: 0.2 deg
carrier Eb/N0: -3.2 dB
carrier Es/N0: -19.96 dB
carrier S/N: 7.40 dB in 30.6 uHz, -37.74 dB in 1Hz, -71.72 dB in 2.5kHz
elapsed 40

The messages were sent off-list to Stefan for verification.

I've had a lot of qrm from charged raindrops (receiver is overdriven most of the time when a charged cloud is overhead), and some thunderstorms.
Thanks to Paul for uploading version 0.8b of the decoder today, which
supports the 2-bit crc.
VY 73

Jacek / SQ5BPF



On Sat, 6 May 2017, DK7FC wrote:

Date: Sat, 06 May 2017 19:04:10 +0200
From: DK7FC <[email protected]>
Reply-To: [email protected]
To: [email protected]
Subject: VLF: 6470...

Hi VLF,

Switched back to 6470 Hz (just by putting the heavy stack of iron powder cores 
into the
coil).
A carrier is running on 6470.005 Hz at 470 mA since 16:10 UTC.

There will be heavy rain very soon but i can transmit during rain. The only 
problem could be
that the resonance cannot be hold. We will see...
If all works well i'm trying a new attempt to nr Moscow (and all other stations 
who are
interested), despite the very strong QRN:

f = 6470.100000 Hz
Start time: 06.May.2017   18:00:00 UTC
Symbol period: 60 s
Characters: 2
CRC bits: 2
Coding 16K21A
Duration: 9h, 4m, 0s
Antenna current: 470 mA

73, Stefan

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