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Links to useful sites
UKQRM - against PLT and other sources of interference.
Radio Society of Great Britian.
American Radio Relay League (ARRL)
Radio Amateurs have been asked "Why don't you just use the Internet?" on various forums by people who could not understand the fascination of radio and radio wave propagation. Have a look at these two sites to see that Radio Amateurs are indeed using the Internet:
Power Line Communications: a Threat for Radio Listening?
IEC/CISPR Threatens Radio Services by a Planned 18 dB Relaxation of PLT Disturbance Limits
Belgian Radio Amataur Mark Demeuleneere's (ON4WW) trials in tracking down radio interference.

Page updated: 27th April 2012
What does PLT sound like?
UPA PLT sounds.
HPA PLT sounds.
Sounds courtesy of UKQRM.