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VLF: 24.1 and 25.0 kHz - China?

from [Markus Vester] [Permanent Link][Original]
To: [email protected], [email protected]
Subject: VLF: 24.1 and 25.0 kHz - China?
From: Markus Vester <[email protected]>
Date: Mon, 11 Jul 2016 06:15:07 -0400
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Since July 1st, I am observing a continuous emission on 25.0 kHz, cochannel with the well-known occasional Russian time signals:
 http://www.df6nm.darc.de/vlf/vlfgrabber.htm
The signal consists of a continuous idle pattern with 25 Hz spaced lines, apparently interrupted every hour by data transmissions of variable duration. During earlier months, the same signal was sometimes visible on 24.1 kHz, just above NAA. Searching the web brings up hints of a Chinese transmitter on that frequency, matching the RDF azimuth (approx. 65°) and diurnal fades (~ 13 and 1 UT) observed here. Does anyone happen to have further info regarding TX location or radiated power?

All the best,
Markus (DF6NM)

 

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