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14 Oct 2014

VTX back on 18.2 kHz

VTX back on 18.2 kHz

27 May 2012

VTX moves to 16.3 kHz

VTX moves to 16.3 kHz

11 Jul 2011

India station back on 18.2 kHz

The Indian VLF station VTX is back transmitting on 18.2 kHz again. Thanks to Peter at the Kiel Longwave Monitor for alerting me to this frequency change!

27 Mar 2011

15.1 kHz located in France

Cross-correlation of the 100 baud baseband signal using the VLF signals from three WWLLN stations gives a location for 15.1 kHz transmission somewhere in France.

15.1 kHz located in France

10 Feb 2011

New signal on 15.1 kHz

New signal on 15.1 kHz

10 Feb 2011

M2 Solar Flare

Sunspot 1081 produced an M2-class flare on June 12th (0055 UT), producing a nice phase advance on the NLK and NWC to Dunedin paths.

13 Jun 2010

NLK20100612

NLK20100612

NWC20100612

NWC20100612

India moves frequency again

The Indian VLF station has moved frequency again. This time they are transmitting on 17 kHz.

Cheers
James.

12 Apr 2010

India moves to 16.3 kHz

I noticed a the start of the year that there is a new VLF signal present at 16.3 kHz. Fairly strong in NZ, Australia, China etc. From the triangulation below, it looks like it is coming from India. So maybe they have moved from 18.2 kHz to get away from the French at 18.3 kHz.

Happy New Year to all!
James.

11 Jan 2010

Solar Activity

At last some activity from Solar Cycle 24. A B4 x-ray event occurred at 2041 UTC on the 22nd Sept 2009, originating from sunspot region 1026. This weak event still shows up in the phase of the signal from NDK and NLK as received in New Zealand.

23 Sep 2009

NDK20090922

NDK20090922

NLK20090922

NLK20090922

23 Sep 2009

NTS Sale shuts down

Looks like NTS Sale (18.6 kHz, Woodside, Australia) is no longer! According to these two articles the station officially closed at the end of 2008:

Omega tower shuts down
Curtain draws on Cold War icon

"At the time the Omega system closed down the Defence Department bought the Woodside site and converted it into a long-range high-powered radio transmitter for submarines. The Tower has been operating in that capacity ever since, but its role has been superseded by more sophisticated technology."

30 Jan 2009

The AARDDVARK Network

UltraMSK VLF receivers are now being used within the AARDDVARK Network. This international network is being used to study the upper atmosphere. VLF radio propagation is used to detect changes in ionization levels at altitudes of between about 50 to 85 km. Their goal is to increase the understanding of energy coupling between the Earth's atmosphere, Sun and Space.

Listen to one of AARDDVARK's principal investigators, Craig Rodger, talk about the network on The Science Show episode dated the 10th of November 2007.

01 Jan 2008

NWC off air since 1 June 2007

NWC off air since 1 June 2007

24 Jul 2007