Date: Mon, 19 Feb 2018 23:56:50 +0000
From: Chris Wilson <dead.fets@gmail.com>
Message-ID: <291109837.20180219235650@gmail.com>
To: DK7FC <rsgb_lf_group@blacksheep.org>
CC: dead.fets@gmail.com
In-Reply-To: <5A8B064D.9020003@posteo.de>
References: <161af073fa5-c86-13005@webjas-vac009.srv.aolmail.net> <5A8B064D.9020003@posteo.de>
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Subject: Re: VLF: DK7FC > W1VD 8.27 kHz EbN0 success!
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Hello DK7FC,


Mind  bogglingly  awesome,  you  chaps  are  the  business :)  Sincere
congratulations. Quite remarkable and very well done!

Monday, February 19, 2018, 5:15:57 PM, you wrote:

>    
>  Hi Markus, 
>  
>  Thanks. Yes you are right, almost to good to be real. But there
> was no fine tuning necessary, no frequency offset, no unexpected
> timing offset, no additional false messages. It seems to be true :-)
>  The best SNR was 10.5 dB in 39.1 uHz. Unbelivable!
>  Based on that, the 2 char message should be there after 2 nights,
> easily:
> http://abelian.org/ebnaut/calc.php?sndb=10.5&snbws=0.000039&snmps=&code=16K21&sp=30&crc=22&nc=2&submit=Calculate
>  Maybe even after one night?
>  
>  Tomorrow will be interesting...
>  
>  73, Stefan
>  
>  Am 19.02.2018 18:05, schrieb Markus Vester: 
>   
>   
> Wow that's almost too good to be true! The "holy grail" of E-W
> transatlantic, achieved in a single good night. Congratulations to
> Jay and Stefan, for boldly daring this experiment and bringing it to this surprising success! 
>   
>  Best 73,
>  Markus (DF6NM)
>   
>  -----Ursprüngliche Mitteilung----- 
>  Von: DK7FC <selberdenken@posteo.de>
>  An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
>  Verschickt: Mo, 19. Feb 2018 16:00
>  Betreff: Re: VLF: DK7FC > W1VD 8.27 kHz EbN0 success!
>   
>     
>   
> Hi Jay, VLF, 
>   
>  An excellent achievement below 9 kHz! And even from a single
> night, without stacking!!! I expected we will need about a week, or even more.
>   
>  To leave a carrier trace or even a message decode over that path,
> from east to west, was one of the goals during the kite experiments
> in 2010/2011, where my ERP was 20 dB higher. We mever managed that. Until now!
>   
>  So maybe the E>W path is less than 20 dB harder. That opens the
> door for more imaginations about VLF DX, not only for me.
>   
>  We need to proove that this is reproducable :-) So let me try a 2
> character message starting this night:
>   
>   f = 8270.1000 Hz
>  Start time: 19.FEB.2018  22:3:00 UTC (daily)
>  Symbol period: 30 s
>  Characters: 2
>  CRC bits: 22
>  Coding 16K21A
>  Duration: 07:12 [hh:mm]
>  Antenna current: 700 mA
>   
>  In the attachment one can see the results put out by the Linux
> decoder running on the file you sent me this morning. Only right decodes and improving rank.
>   
>  Can we really expect 2 characters in 2 days? We will see! Let's go!
>   
>  73, Stefan
>   
>   
>   
>   
>  Am 19.02.2018 15:41, schrieb jrusgrove@comcast.net:  
>   

> Stefan's transmission: f = 8270.1000 Hz
> Start time: 12.FEB.2018  22:32:00 UTC (daily)
> Symbol period: 32 s
> Characters: 1
> CRC bits: 24
> Coding 16K21A
> Duration: 07:06:40 [hh:mm:ss]
> Antenna current: 700 mA
> After a week of trying ... including two nights with TX problems,
> one night with RX problems and one night with high noise levels ...
> a successful decode of Stefan's message was made on last night's
> transmission. s/n in 39 uHz 10.5 dB and Eb/N0 2.54 dB. It was pretty
> convincing as the decode popped up in the 0,0,0,0 phase trial and
> only improved thereafter. Congrats Stefan on what appears to be the
> first E>W T/A on Dreamers Band! Jay W1VD       
>    


-- 
Best regards,
 Chris                            mailto:dead.fets@gmail.com