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LF: RE: VLF QRM free window becomes smaller?

To: "[email protected]" <[email protected]>
Subject: LF: RE: VLF QRM free window becomes smaller?
From: Rik Strobbe <[email protected]>
Date: Tue, 13 Apr 2010 14:16:17 +0200
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Thread-topic: VLF QRM free window becomes smaller?
Stefan,
 
maybe thunderstorms coming up in the afternoon ?
 
73, Rik  ON7YD
 

Van: [email protected] [[email protected]] namens Stefan Schäfer [[email protected]]
Verzonden: zondag 11 april 2010 20:19
Aan: [email protected]
Onderwerp: VLF: VLF QRM free window becomes smaller?

Dear LF,

Taking a look on Markus' VLF grabber, it seems, the time window with a minimum QRN becomes smaller in the last weeks(see the picture). Has anyone experience (Paul?) if this is a daily accident or a tendency when going to the summer? What will be in one month?

BTW, my 600W PA almost works; the amperemeter (1A full range) is now inserted into the coil and is calibrated; i built up a narrow band active E field antenna for the dreamers band (2x BF862, 2 band pass filters, BW abt 500Hz, preamp noise 20dB above soundcard noise, preamp + VLF noise 40dB above soundcard noise, decoupling AF transformer) that will give my new VLF grabber in Heidelberg :-)

Things are going on and new records will have to be done :-)

Best 73, Stefan/DK7FC

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