Some recent milestones with amateur radio experiments at VLF.

With a few items at LF and MF. Send any corrections and additions to

YYYY-MM-DDFromToFrequency HzDistance kmNotes
2010-03-15DK7FC/PTodmorden, UK8970.01858.7 Stefan's 2nd kite transmission. Up to 1.7mW ERP, signal average 1.34fT peak 3.1fT, 6.6 sigma. New detection distance record.
2010-03-21DK7FC/PIK1QFK8970544 Stefan's 3rd kite transmission. Signals received by 10 stations. First VLF transmission Germany to Italy.
2010-08-01DK7FC/PTodmorden, UK6469.97858.7 Stefan's 6th kite transmission. First experiments at 6470 Hz. 200m kite elevation. Received by 7 stations. First VLF detection Germany to France F5WK.
2010-10-02DK7FC/PSQ5BPF8970904 Stefan's 7th kite transmission. New carrier detection distance record. First VLF signal detection Germany to Poland.
2010-10-23DK7FC/PSQ5BPF5170904 Stefan's 8th kite transmission. First use of 5170 Hz. Received by 6 stations.
2010-10-23DK7FC/PEI8JK89701310 Stefan's 8th kite transmission. New distance record at 8970. DFCW-600. First use of GPS locked transmission.
2010-12-04DK7FC/P4X1RF89702873 Stefan's 9th kite transmission. Record VLF ERP of 58mW at 8970. Received by 23 stations in 9 countries. New distance record for carrier detection.
2011-02-06DK7FC/PTF3HZ89702404 Stefan's 10th kite transmission. First VLF into Iceland. Received by 24 stations in 9 countries.
2011-02-07OE5ODLTF3HZ8970.032766 First VLF Austria to Iceland. OE5ODL with 80m balloon.
2011-02-17OE5ODL4X1RF8970.032478 First VLF Austria to Israel. OE5ODL with 125m balloon.
2011-03-04G3XIZTodmorden, UK9090.91006218 Signal detection, 9.6 sigma in 70uhz, 0.2fT. UK distance record.
2011-11-27DF6NMTodmorden, UK1031.5 First MFSK at VLF. Germany to UK. Kite transmission. 5 chars in 25 minutes.
2012-03-25DF6NMOK2BVG8970424 First VLF international QSO. Using MFSK-37 with 30 minute characters. Both sides of the QSO copied in Todmorden, UK.
2013-12-31DF6NMDK7FC8970.000175 OPDS-4H. First use of Opera at VLF. -58.3dBOp 100% 17.0dB.
2014-01-01DF6NMTodmorden, UK8970.0001028.4 OPDS-4H. Record distance for Opera at VLF. -59.1dBOp 100% 16.3dB
2014-03-02WH2XBA/1Todmorden, UK29499.05424.7 First T/A carrier detection at VLF.
2014-03-04WH2XBA/1DF6NM29499.06451.7 Distance record for T/A carrier detection at VLF.
2014-05-10DF6NMTodmorden, UK8270.0001028.4 First use of EbNaut at VLF. Two messages, 4K21A 5chars 30 second symbols, Eb/N0 -0.5dB and -1.5dB.
2014-05-18DF6NMTodmorden, UK8270.0001028.4 First use of 8K25A, 15 second symbols 14 chars. Eb/N0 = -0.4dB.
2014-05-30W4DEXKE4RJQ8970.1000254.2 First strong sub-9kHz transmission in North America. Carrier detection at Forest, VA.
2014-06-02W4DEXTodmorden, UK8971.00006194.2 First T/A sub-9kHz signal detection west to east.
2014-06-03W4DEXHawley, Texas8971.10001816.2 Distance record for carrier detection in N/A.
2014-12-02W4DEXDL4YHF8820.0006917.7 Distance record for carrier detection.
2014-12-18W4DEXIK1QFK8820.0007173.4 Distance record for carrier detection.
2014-12-29W4DEXKE4RJQ8822.000254.2 First use of EbNaut in North America. 16K25A 9 seconds 4 chars. Eb/N0 = 6.3dB.
2014-12-30W4DEXTodmorden, UK8822.0006194.2 First T/A message west to east. 'EM95'. EbNaut 16K25A 9 seconds Eb/N0 = -0.8dB
2014-12-30W4DEXW4GON8822.000869.4 Distance record in North America for EbNaut. 16K25A 4 chars
2014-12-31W4DEXTodmorden, UK8822.0006194.2 Longest T/A EbNaut message. 16K25A 14 chars 14 second symbols Eb/N0 = +1.0dB
2015-01-01W4DEXTodmorden, UK8822.0006194.2 Longest T/A EbNaut message. 16K25A 25 chars 8 second symbols Eb/N0 = -0.1dB.
2015-01-07DF6NMTodmorden, UK8280/83401028.4 Path length measurements from group delay.
2015-02-08W4DEXKE4RJQ8822254.2 Longest VLF message. 40 chars 8K19A 1.5 seconds Eb/N0 = +1.5dB,
2015-08-16IZ7SLZDF6NM137502.01261059.2 First successful EbNaut message on LF. 6 chars 8K19A 3 second symbols Eb/N0 = 5.8dB. First coherent BPSK at LF.
2015-09-19IZ7SLZDF6NM137502.12/137510.001059.2 First 2-way contact using EbNaut. 8K19A 21 chars, 1 second symbols. Eb/N0 from 1.6 to 11.0dB.
2015-11-15IZ7SLZDF6NM478499.931059.2 First EbNaut 2-way contact using MF. 8K19A 22 chars 0.3 second symbols. Eb/N0 from 2.0 to 15.8dB.
2015-11-24VO1NAIZ7SLZ137776.999685418.2 LF distance record for EbNaut. Eb/N0 = 1.4dB, 8K19A 7 chars 2 second symbols.
2016-03-03VO1NAIZ7SLZ477700.00005418.2 MF distance record for EbNaut. Several decodes with Eb/N0 from 3.6dB to 17.9dB. 4K19A 10 chars 2 second symbols. TX 30 Watts to 100m rotated L mean height 15m.
2016-12-31IW4DXWVO1NA137485.00064135.0 LF east-to-west distance record for EbNaut. 8 chars 8K19A 2 second symbols, Eb/N0 = -0.3dB
2017-01-21DK7FCDL4YHF2970.000303.8 Distance record for ULF signal detection.
2017-01-24DK7FCDL4YHF2970.000303.8 ULF distance record for decode, 3 chars 16K25A +2.4dB.
2017-01-25DK7FCDL4YHF2970.000303.8 5 chars 16K25A +4.5 dB
2017-01-28DK7FCRN3AUS8270.0051985.6 First VLF detection, Germany to Russia.
2017-02-10DK7FCRN3AUS8270.11990 First VLF message, Germany to Russia. 30 seconds 16K21A 32 bit CRC 2 chars Eb/N0 = +1.13dB.
2017-03-11DK7FCTodmorden, UK2970.000081881 Distance record for carrier detection at 2970. 13:00 to 00:00 with 9 days stacked to give 14.0 dB S/N in 25.25 uHz.
2017-03-12DF6NMTodmorden, UK5170.00251028.4 Distance record for fixed antenna at 5170Hz. 11.2dB in 55.5uHz from about 1uW ERP.
2017-04-03DK7FC9707.2 First experiments on 970 Hz. 7.2 km S/N 30dB in 424 uHz.
2017-04-08DK7FCTodmorden, UK8270.1881 Longest EbNaut message at VLF. 85 chars Eb/N0 +0.8 dB.
2017-04-19DK7FCTodmorden, UK6470.1881 40 character message using 16K25A, 4 second symbols Eb/N0 = 0.0 dB. Longest message at 6470 Hz.
2017-04-19DK7FCSQ5BPF6470.1919.3 2 character message, 16K21, 30 second symbols Eb/N0 = 1.6 dB, new distance record at 6470 for EbNaut.
2017-04-21DK7FC97014.4 Distance record for 970 Hz. S/N peak 18dB in 424uHz.
2017-03-23DK7FCRN3AUS6470.11985.6 Distance record for message decode at 6470 Hz. 2 chars 16K21A S=40 CRC=32, Eb/N0 = +0.4 dB.
2017-04-28DK7FC,DF6NMDL0AO8270.005,8270.00513889 Combining coherent signals from two stations to produce a rotating beam.
2017-05-05DK7FCTodmorden, UK8270.1881 Longest EbNaut message, 100 chars 8K19A S=10 CRC=0. Eb/N0 = +0.2 dB.
2017-05-07DK7FCTodmorden, UK6470.1881 Longest EbNaut message at 6470, 75 chars 8K19A S=15 CRC=2, Eb/N0 = +0.8 dB.
2017-05-08VO1NATodmorden, UK8270.00706253575.5 First T/A from CA to UK. 10uW ERP, S/N 13.9 dB in 46.296 uHz.
2017-05-18DK7FC97027.2 Distance record for 970 Hz and message decode. EbNaut 5 chars 16K21A CRC=4 100 second symbols, Eb/N0=2.1 dB, -71.2dB in 2.5 kHz.
2017-05-25DK7FCTodmorden, UK8270.1881 Longest EbNaut message at VLF, 160 chars 8K21A S=10 CRC=10, Eb/N0 = +0.6 dB.
2017-06-10DK7FCTodmorden, UK6470.1881 Longest message at 6470Hz, EbNaut 100 chars 8K21A S=20 CRC=8, Eb/N0 = -1.1 dB.