Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

LF: 29 and 24 kHz, night and day

To: <[email protected]>
Subject: LF: 29 and 24 kHz, night and day
From: "Markus Vester" <[email protected]>
Date: Thu, 6 Mar 2014 00:25:47 +0100
Authentication-results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of [email protected]) smtp.mail=[email protected]; dkim=fail [email protected]
Delivered-to: [email protected]
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1394061949; bh=TsVZ+3z/uxFIExgLVMtKrAGV2aiWjMtKvXMWbbzPArY=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=QyvIiXPEijFZCef+8ZEYhOS49P/UPlO/EBCywl10jnILrxggFr4Dv+y2eAVrAl26l 3L/qXfHXBWvvV6XDE43zi8OSOcJl1YwQF92rXJ2jR9l8a55BzEHAHbi+Oa8dWKcna9 ua5vVZTrc98RXrxSpMIpnK54HpbOJs8ulXW0GWKg=
Importance: Normal
Reply-to: [email protected]
Sender: [email protected]
Attached is a little 24 hour plot of NAA 24 kHz, versus the local noise floor on 29.5 kHz (note that there is an offset between the two due to the antenna bandpass filter favouring 29 kHz, NAA would really be higher above the noise in 1 Hz).
 
Interestingly the night-to-day level difference is only very few dB between midnight (3 UT) and midday (15 UT) over the Atlantic. It is almost compensated for by the decreased background noise, especially during the late morning hours. Bob actually left a couple of discernible pixels when he stayed on after our local sunrise: http://df6nm.de/vlf/vlfgrabber.htm
 
Best 73,
Markus (DF6NM)
 
PS. I've split the spectrogram in case Dex would show up again on 29.501 kHz. 
 

Attachment: plot_29kHz_140305_2309.png
Description: PNG image

<Prev in Thread] Current Thread [Next in Thread>
  • LF: 29 and 24 kHz, night and day, Markus Vester <=