Communications and Electronics Section

Better Caving Through Electrical Stuff

Magnetic Moments

With the recent interest shown within the cave electronics community about radio frequencies and their relationship to overburden, we're re-publishing Ian Drummond's early series of ten articles on the topic.

Click on the links below to view the articles:


  1. MAGNETIC MOMENTS, Number 1, by Ian Drummond
  2. MAGNETIC MOMENTS, Number 2, by Ian Drummond
  3. MAGNETIC MOMENTS, Number 3, by Ian Drummond
  4. MAGNETIC MOMENTS, Number 4:   FERRITE CORE ANTENNAS, by Ian Drummond
  5. MAGNETIC MOMENTS, Number 5:   THE PHASE PROBLEM, by Ian Drummond
  6. MAGNETIC MOMENTS, Number 6:   THE TRANSITION ZONE, by Ian Drummond
  7. MAGNETIC MOMENTS, Number 7:   ELECTROMAGNETIC NOISE - NATURAL SOURCES OF NOISE, by Ian Drummond
  8. MAGNETIC MOMENTS, Number 8:   ANTENNA NOISE, by Ian Drummond
  9. MAGNETIC MOMENTS, Number 9:   GROUND CONDUCTIVITY BY ELECTRO-MAGNETIC (EM) METHODS, by Ian Drummond
  10. MAGNETIC MOMENTS, Number 10:   AN RF PROBE, by Ian Drummond