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Re: R: Re: VLF: EbNaut message over 2877 km, DK7FC to RC4HAA

To: [email protected]
Subject: Re: R: Re: VLF: EbNaut message over 2877 km, DK7FC to RC4HAA
From: Domenico IZ7SLZ <[email protected]>
Date: Thu, 9 Nov 2017 17:59:41 +0100
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Hello VLF,

First of all, congratulations to Stefan, Paul and all OM partecipating at these experiments for the successfull results.

I'm trying to receive some VLF Ebnaut, in Apulia -South Italy, till now without joy.

Unfortunatly, the remote location at Aunt Melina farm (AMF) , 5 km away from my city is not yet ready. 
In the same time i'm trying, in my urban usual location, to streaming (locally) the audio captured from linux pc using vlfrx-tools utilities.
Vorbis stream sent by vtvorbis is received via lan from Spectrum Lab on Xp PC. A 42 uHz grabber is running since 3 days now.

Linux pc is also recording the raw audio using vtwrite. 
So i'm making some attempts to decode Dk7fc ebnaut trying to guess the best parameters for vtblank.
I have some question for Paul:
Can you suggest and give some indications how to stack raw audio of two or more different days using vlfrx-tools?

Some advice for the vtblank configuration? 

I'm using version 07p.

...and questions for Joe VO1NA:
Can you specify again the start time, frequency and all parameters of your EBNAUT transmissions? Some long carrier has been transmitted by you and in which hour?
Thanks in advance. 
73, Domenico /IZ7SLZ

On 9 Nov 2017 17:28, "Paul Nicholson" <[email protected]> wrote:

Stefan wrote:

> f = 8270.1000 Hz
> Start time: 07.November.2017  16:00:00 UTC
> Symbol period: 60 s
> Characters: 3
> CRC bits: 9
> Coding 16K21A
> Duration: 12:32

> Paul, did you copy my message from last night and the night
> before?

Yes, a strong signal here and perfect decode of the 3 chars:

            H-field           E-field             E+H field
 7th/8th  10.5 dB 99.8 deg   9.0 dB 107.3 deg   12.5 dB 103.3 deg
 8th/9th  14.1 dB 88.3 deg  12.5 dB  93.8 deg   17.3 dB  90.9 deg

> I am getting no decode at RC4HAA, even when stacking both nights.

Signal phase repeated fine both nights.  Given the S/N of your 2 char
success, you would be very lucky to do 3 chars in one night, but two
nights ought to do it.

Paul Nicholson

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