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Re: LF: Re: [rsgb_lf_group] MF: DJ0ABR -> JA3TVF in WSPR

from [Markus Vester] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Re: [rsgb_lf_group] MF: DJ0ABR -> JA3TVF in WSPR
From: Markus Vester <[email protected]>
Date: Fri, 14 Oct 2016 17:57:57 -0400
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Something strange happened on LF around the same time: Looking at the WSPR spectrogram, I happened to notice a marked noise increase for about eight minutes around 19:15 UT. It is visible as a purple strip on two grabber screenshots: 
http://df6nm.bplaced.net/LF/vlf_lf_icm_2013/test1610131915.jpg
http://df6nm.bplaced.net/LF/vlf_lf_icm_2013/test1610131930.jpg

The noise band was caused by an unusually intense Luxembourg effect, with a pair of strong VLF stations (GQD and DHO) acting as a ionospheric heaters, impressing their difference frequency onto the DCF39 carrier:

138.83 - (23.4 - 22.1) kHz =  137.53 kHz

Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: Roelof Bakker <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Fr, 14 Okt 2016 10:27 pm
Betreff: LF: Re: [rsgb_lf_group] MF: DJ0ABR -> JA3TVF in WSPR

Hello Clemens,

There certainly was an opening to Asia last night.
At 19:28 UTC, I logged a NAVTEX station from Malaysia on 518 kHz
over a distance of 10.015 km.

73,
Roelof, pa0rdt



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