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Date: Thu, 30 Jun 2016 11:12:59 +0200
From: DK7FC <selberdenken@posteo.de>
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References: <5772DAC0.7080001@df3lp.de> <CAA8k23TGuNuOZcnJA42=EDxZgHMAVNeq9SM7=UhvTz6Noqa_FA@mail.gmail.com> <5773CA12.50009@posteo.de> <5773D53A.5070900@abelian.org>
In-Reply-To: <5773D53A.5070900@abelian.org>
Subject: Re: ULF: Key down signal on the 101 km band, still on the air
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Status: O

Hi Paul,

Amazing! Although there's no result yet :-)
It's a distance of 8.7 wavelengths. A detection would be a good DX 
result on the lowest frequency ever used by radio amateurs. Something 
NEW i would say ;-)

It should be no problem to add 20(+) dB in future coil designs.

Am 04.06.2016 18:57, schrieb Paul Nicholson:
>
> Stefan wrote:
>
> > Message 22.05.2016: 'cqcq dk7fc in jn49ik'
>
> 18.22 dB in 4.06 uHz,
>
>  http://abelian.org/vlf/tmp/160604a.gif 
That was the 68 hour transmission on 6.47 kHz at 270 mA. Going from 6.47 
kHz to 2.97 kHz means -6.8 dB, 270 mA to 30 mA means -19 dB, i.e. 26 dB 
less signal. But i estimate the average QRN background is at least 10 dB 
lower. So let's say the SNR is 16 dB lower.
That would mean 2 dB in 4 uHz. If 8 dB SNR produces a peak of acceptable 
significance, i need to transmit for about 10 days! So let's say 2 weeks 
:-) After 2 weeks there could be something significant :-)
It would be very interesting to see the peak SNR building up day by day 
in a smaller and smaller BW. I'm looking forward to that.

The carrier is on the air since 92 hours now...

73, Stefan


Am 29.06.2016 16:03, schrieb Paul Nicholson:
>
> > Paul, if you are reading this: It may be worth
> > to try to integrate the overall transmission
> > time into one peak.
>
> I've been trying with this transmission, and your earlier
> tests too.   Bandwidths down to 6.6 uHz.   I've been trying
> combinations of days and nights and both.
>
> So far, not the faintest hint of signal.
>
> I will continue to try, for as long as you can maintain the
> carrier without phase interruption.
>
> -- 
> Paul Nicholson
> -- 
>