NEW! Live data online

Click here to view live plots of VLF stations DHO, JXN, NAA, NLK, NPM, NWC and many more.

Gallery of UltraMSK VLF data

Antenna mast

Below is a sample of VLF data obtained using UltraMSK. All signals were received in Dunedin, New Zealand, using a vertical electric field antenna.

Each plot has a title of the form XXXYYYYMMDD.txt where XXX is the transmitter call sign and YYYYMMDD is the date. All times and dates are given in UTC. On each plot the blue trace represents the high frequency of the MSK modulation and the red is the low frequency.

Interested in setting up your own UltraMSK receiver? The UltraMSK system requirements section has more information.

NLK 25 September 2009

NLK 25 September 2009

25 Sep 2009

NPM 25 September 2009

NPM 25 September 2009

Sunspot region 1026 produced a C2 x-ray flare at 0102 UT

25 Sep 2009

NLK 25 March 2008

NLK 25 March 2008

M1.7 solar flare starting at 1836UT from sunspot region 989

25 Mar 2008

NAA 25 March 2008

NAA 25 March 2008

M1.7 solar flare starting at 1836UT from sunspot region 989

25 Mar 2008

NPM 25 March 2008

NPM 25 March 2008

M1.7 solar flare starting at 1836UT from sunspot region 989

25 Mar 2008

NPM 13 December 2007

NPM 13 December 2007

C1.7 solar flare starting at 2152UT from sunspot region 978

13 Dec 2007

NLK 2 May 2007

NLK 2 May 2007

C8.5 solar flare at 2348UT

02 May 2007

NTS 18.6 kHz 2 May 2007

NTS 18.6 kHz 2 May 2007

C8.5 solar flare at 2348UT

02 May 2007

NTS 18.6 kHz 28 April 2007

NTS 18.6 kHz 28 April 2007
This 100 baud MSK signal is received very strongly in New Zealand. The center frequency of the transmission is 18600.000185 Hz. The signal is radiated from the location previously used for transmitting the Omega Australia VLF signal.

28 Apr 2007

NPM 27 April 2007

NPM 27 April 2007

B6.3 solar flare at 2037UT

27 Apr 2007

NLK 27 April 2007

NLK 27 April 2007

B6.3 solar flare at 2037UT

27 Apr 2007

NPM 24 April 2007

NPM 24 April 2007

C2.8 solar flare at 2256UT

24 Apr 2007

NLK 24 April 2007

NLK 24 April 2007

C2.8 solar flare at 2256UT

24 Apr 2007

NWC 24 April 2007

NWC 24 April 2007

C2.8 solar flare at 2256UT

24 Apr 2007

NWC 11 January 2007

NWC 11 January 2007

B9 solar flare at 0105 UT

11 Jan 2007

2006 Gallery

More UltraMSK data can be viewed in the 2006 UltraMSK Gallery.

01 Jan 2007