VOACAP - IONCAP - http://elbert.its.bldrdoc.gov/hf.html US DOC NTIA's propagation modeller (as used by "Voice of America").. Maintained by Greg Hand whose web page has all sorts of useful stuff.
Radio Mobile - A very nifty program for VHF and UHF links
Chirp Sounding
http://www.keele.ac.uk/depts/por/psc.htm - RSGB Propagation Studies Committee
http://hfradio.org/propagation.html - hfradio.org Propagation
http://www.lwca.org/library/lfprop/adcock/lfprop1.htm - long wave (100-200 kHz) propagation article
http://www.pacificsites.com/~brooke/HF_Prop.html - HF Propagation & RCS-5A Chirp Sounder
/radio/prop/index.htm - 2 Jan 2003 - Jim
Lux
radio home page - Jim's
home page