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Longwave is loosely defined as the frequencies below 500 kHz (sometimes called Very Low Frequencies VLF and extending downward to the Extremely Low Frequencies ELF which overlap the top of the human audio spectrum).

RAC Logo 136 kHz at G3YMC
RAC Logo 136 kHz Direct Conversion Receiver
RAC Logo 200W 136 kHz Transmitter
RAC Logo Active Loop Converter for LF
RAC Logo Alex's Longwave Page
RAC Logo Altair's YWK Lowfer Page
RAC Logo AMRAD LF Web Page
RAC Logo Brief Introduction to Longwave Radio
RAC Logo DK8KW Longwave Information (Band Plan)
RAC Logo DK8KW Slow Voice   
RAC Logo Extremely Low Frequency Communications Program - United States Nuclear Forces
RAC Logo GW4ALG 136 kHz Page
RAC Logo Ham Radio Online - VLF Radio  
RAC Logo Newcomer’s Guide to LF Weak Signal Receiving Techniques
RAC Logo Larry's Very Low Frequency Site
RAC Logo LF Experimenting and Home Brewing
RAC Logo Long Wave Club of America - A Longwave Home Page  
RAC Logo Longwave Club of America
RAC Logo Longwave DXing
RAC Logo Longwave Index
RAC Logo Lowfer Beacon Transmitter
RAC Logo Low Frequency Experimenter's Handbook RSGB
RAC Logo Low-Frequency Radio Time Signals
RAC Logo LWCA Home Page
RAC Logo NASA online VLF receiver
RAC Logo Part 15 Radio Stations of North America
RAC Logo Propagation in the LF-Band 
RAC Logo Radio Waves Below 22 kHz
RAC Logo Really Simple Loop
RAC Logo Rock's Longwave Beacon Log
RAC Logo
RAC Logo Submarine Communications Master Plan (December 1995)
RAC Logo A Ten Foot Receiving Loop for Low Fequency DX Work
RAC Logo Transatlantic on 136 KHz
RAC Logo Very Low Frequency (VLF)
RAC Logo VK2ZTO Experimentation Web Pages
RAC Logo VLF Time Signal Broadcasts