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LF Amateur Radio

Mike Dennison, G3XDV

LF Links Page

Operators (26 links)	Personal sites of LF operators CT1DRP, DF3LP, DK8KW, DL4YHF, F5MAF, G3NYK, G0MRF, G3YMC, G3YXM, G3YXM, G3XBM, G4FTC, I5TGC, IK2PII, IQ2MI, OH1TN, OK1FIG, ON7YD, RU6LA (in Russian, some English), SV1XW, SV8CS, V01NA, VK1SV, VK2XV, W4DEX Pictures of LF operators
Inductors (2 links)	Many free computer programs originally from the late G4FGQ, including TOROID which helps when winding LF coils. GM0RWU's Java Toroid Design Applet gives the turns required on many types of toroidal core.
Transmitters, Transverters, Receivers and Oscillators (14 links)	DDS VFO by SM6LKJ GW4ALG's LF Equipment G3YXM's 136kHz Transmitters G0MRF's 300W Tx G3YMC's Transverter Transverter by AA1A 700W Switch-mode Transmitter by G4JNT IK2PII's VXO IK2PII's Direct Conversion Receiver Modifying a TS-950 for better 136kHz performance 472kHz transmitter by DL4YHF GW3UEP's 472kHz transmitter project VFO design by LA8AK Class E transmitter design for 136kHz by VK1SV
Antennas, Tuning Units and QRN Reducers (9 links)	GW4ALG's Antennas G3YMC's Transmitting Loop Experiences The tiny antenna used by I5TGC who has been received in the UK, and his receive loop (follow site links) ON7YD's antenna pages IK2PII's Loading Coil M0BMU's Antenna Impedance/Phase Meter DL4YHF's 472kHz tuner Ferrite tuned variometer by VK1SV and his air cored one
Propagation and Weather (10 links)	Sunspots, conditions and much more Lightning Map of the World (zoomable) Lightning Map of Europe/Africa Lightning Map of the Americas Lightning Map of East Asia / Australia Lightning Map 600km radius of southern England NOAA site G3NYK's unique research into small signal propagation at 136kHz D-Region Absorption Predictions from NOAA LASP Colorado: Dst predictions and measurements (high Dst tends to mean good DX conditions on 136kHz).
Best, First and Furthest LF DX (2 links)	List at RU6LA's site The 'Matrix' at G3YXM's site
Software (6 links)	For receiving QRSS Argo (probably the easiest to use) SpecLab For transmitting QRSS QRS ON5OO's Signal Strength Plotting Software For LF data mode WOLF Data mode Opera, popular on 136 and 472/500kHz
Remote receivers and signal reporting (26 links)	QRSS live screen grabs: Note: these 'grabbers' may not be operational 100% of the time, but are worth checking. There are grabbers for 136kHz, 500kHz and VLF, and at speeds from QRSS3 to extremely long term plots. They are very useful for propagation tests as you can see very quickly whether your signal reaches a certain point on the globe. 4X1RF, DF6NM, DK7FC, DM4TR, EW6BN, F1AFJ, G3YXM, G4WGT, GM4SLV, IK1WVQ, JA(Tokyo), JA7NI, KL7UK, LU8YD, RN3AGC, RN3AUS, RV3APM, RW3ADB, TF3HZ, UA0SNV, VE1VDM, VE2IQ, VK1SV, W1VD, W4DEX, YV7MAE DXCluster 136kHz Spots Reverse Beacon Network PSK Map - where Opera (and other) users have been received WSPR database - who's receiving what on this mode
Useful LF pages (8 links)	AMRAD: Group of Experimenters in the US Longwave Club of America Very Low Frequency Group at Stanford University Cave Radio and Electronics Group (CREG) SV1XV's info on LF in the Eastern Mediterranean Loran Lines (LWCA) | More Loran Lines (G4CNN) All about NDBs and a frequency listing
Other LF resources (5 links)	rsgb_lf_group For many years this e-mail reflector has facilitated the coordination of the very latest activity and and the exchange of technical discussion to all who subscribe (free). Originally hosted by blacksheep.org, it became a Yahoo group in June 2012. There are two ways to join: (1) Send an e-mail to: rsgb_lf_group- subscribe@yahoogroups.co.uk, or (2) Go to the web site: http://uk.groups.yahoo.com/group/rsgb_lf_group/ and follow the appropriate link. Russian speakers have a group at: http://groups.yahoo.com/group/lf_dw LF Today An RSGB book that is eessential reading for everyone interested in getting started on LF, or trying to improve their existing station. Radio Communication Handbook The RSGB's flagship book, covering all technical aspects of amateur radio, including a whole chapter on the bands below 1MHz.
Other useful sites (1 link)	Radio Society of Great Britain: The very latest amateur radio news, a comprehensive book shop and much more.

Last updated 19 Feb 2013