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Date: Thu, 10 Mar 2011 23:00:21 +0100
From: wolf_dl4yhf <dl4yhf@freenet.de>
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Subject: Re: LF: VLF Whistler activity
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Hi Stefan,

> Really impressing! Rather interesting than "real" radio! :-) I'm 
> listensing since your mail appeared :-)
> Wolf, is it your remote RX via VHF?
UHF - see previous post. In the 70 cm band.
> As long as i don't go out of the city by at least 2 km i do not think 
> i would get such a clean spectrum...
>
Guess how far it is from the remote receiver (@DF0WD) to my home...  
thus the yagis ;-)

> Do you use SpecLab as a part of this system? Is the "Paul Nicholson's 
> hum filter" in use?
>
Yes and no. The hum is removed by the FFT-based filter, operating in 
automatic multi-notch mode. All "stable carriers" (mains harmonics) 
which exceed a certain (variable) threshold are removed, nothing else. 
The older multi-stage comb filter sounded a bit too hollow because it 
removed *any* harmonic of 50 (or 60) Hz, even if there was no unwanted 
noise.

Unfortunately this cannot defeat the static rain (popping noise) which 
is just beginning as I write this :o(

73,
   Wolf .