Message-ID: <5710BCBA.60901@posteo.de>
Date: Fri, 15 Apr 2016 12:04:42 +0200
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <57101A93.9050904@posteo.de> <8D364FDC57083E1-13C0-757EEB@webmail-vm186.sysops.aol.com> <5710A5DD.7040300@abelian.org>
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Subject: Re: LF: TXing on VLF again, A fan in series to the antenna?! :-)
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Status: O

Hi Paul,

Thanks for the peak :-)
When talking about ERP, how strong is Markus' and Uwes signal? Just to 
get an impression. I don't know their ERPs.

It was raining in the morning. I had to bring the coil down to the 
office again. In the coming days i want to build a waterproof 
construction, something like a small tent :-)

But the forced air flow by the fan is causing a swinging of the 2 small 
ferrite rods in the center of the coil. I can see it in the antenna 
current! So the phase is probably not very stable. I will search for a 
better solution and already know one, to be tested...
Also i want to test the PLL with the small pickup probe tracking the 
local fields from the radiated signal.

Then i can run a 'key-down' carrier for one week or longer :-)

73, Stefan

Am 15.04.2016 10:27, schrieb Paul Nicholson:
>
> This time, a good signal at about 0.35 fT
>
>  http://abelian.org/vlf/tmp/160414a.gif
>
> but the noise was high from the same direction so
> cannot be avoided by steering the loops away.
>
> I don't know if this is 150uW, from the signal
> strength I might guess 50uW max, probably more
> like 30uW.
>
> I ran all 6300 seconds of the carrier through EbNaut to
> decode an 'all-star' message at two settings:
>
>  Code   Symbols    Chars   Eb/N0
>  8K19A   15.0 sec    3     +0.5 dB
>  16K25A   7.7 sec    3      0.0 dB
>
> I couldn't get a 4 char message to decode.  If the
> noise wasn't so high this signal would do very well.
>
> How about a daytime test?
>
> -- 
> Paul Nicholson
> -- 
>