NVIS

Near Vertical Incidence Skywave

NVIS Techniques

1. What is NVIS?
2. Applications of NVIS
3. Antennas for NVIS
4. NVIS Frequency Selection
   • Good guess: 40 by day, 80 by night
   • Pre-arranged schedule of frequencies to try
   • Propagation prediction programs
     • VOACAP Coverage Analysis Program
   • Online propagation maps
     • Critical frequency map of the world
     • DR2W Propagation maps