Message-ID: <4D35E6D1.6030401@iup.uni-heidelberg.de>
Date: Tue, 18 Jan 2011 20:15:29 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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References: <797ad.4f2d887c.3a671a48@aol.com> <Pine.LNX.4.64.1101181855200.1022@paranoid.lipkowski.org>
In-Reply-To: <Pine.LNX.4.64.1101181855200.1022@paranoid.lipkowski.org>
Subject: Re: VLF: 8970.02 Hz + 10th
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Hi Jacek,

Yes, that's indeed an interesting issue! I have observed the same, you 
still can see it on my grabber. So maybe we see an effect that shows us 
that we shouldn't just think: "The less noise, the better the SNR". I 
assume that this effect is rather an issue arround 6...9 kHz, where the 
sferic energy has its maximum. I assume this since i observe that e.g. 
DHO38 or all the MSKs are no so strong affected by this propagation 
change since the SNR increases and the signal levels are about the same 
while below 9 kHz the signals AND noise decreases and the SNR slightly 
decreased!
Fixed antennas at constant power and many grabbers are very useful to 
observe these local effects live.

BTW if we see the SNR of OE5ODL here in about 400 km distance, it is 
probably that G3XIZ can reach Germany in DFCW-6000 as well, if he uses 
his balloon antenna! :-)

73, Stefan

Am 18.01.2011 19:11, schrieb Jacek Lipkowski:
> OE5ODL is active today too. what is strange is that the 9kHz amplitude 
> (both his signal and noise) seem to be much lower, while the gain 
> hasn't been changed from yesterday (i've enclosed the 179uHz waterfall 
> from the last 2 days). there is also a weak trace at 8969.965Hz.
>
> today i don't see anything in 3.8mHz.
>
> jacek