The RSGB has an excellent site on BPL: http://www.qsl.net/rsgb_emc/#plt with examples of what it sounds like: http://www.qsl.net/rsgb_emc/pltsounds.html The BBC R+D Group produced a white paper on the subject: http://www.bbc.co.uk/rd/pubs/whp/whp067.html Enjoy! Eric W3DQ Washington, DC