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Antennas & Propagation

Antennas & Propagation. A mixed bag from VLF to VHF Brian Austin G0GSF. The First Antenna?. …and The First Radio Signals?. Marconi’s antenna 1896. Oliver Lodge’s Biconical 1897. Marconi’s monster 1901. Ground Waves. The EM Spectrum. ELF=30 to 300 Hz.

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Antennas & Propagation

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  1. Antennas & Propagation A mixed bag from VLF to VHF Brian Austin G0GSF

  2. The First Antenna?

  3. …and The First Radio Signals?

  4. Marconi’s antenna 1896

  5. Oliver Lodge’s Biconical 1897

  6. Marconi’s monster 1901

  7. Ground Waves

  8. The EM Spectrum

  9. ELF=30 to 300 Hz

  10. Submarine propagation

  11. Project ‘Sanguine’ USN 1970s

  12. Transmitting to Submarines

  13. Arboreal Aerials

  14. The HEMAC

  15. Trees as transmitters • TX frequency: 450kHz • TX power: 35W • TX range: 35miles CW; 15miles AM. • And it was directional!

  16. Tree-to-Tree • TX frequency: 4.65MHz • TX power: 15W CW/SSB • Horizontal RX antenna better than vertical!

  17. Coupling through Forests

  18. Radio Underground

  19. SSB Underground

  20. NVIS propagation

  21. NVIS & the Ionosphere

  22. Spot the NVIS antenna

  23. NVIS Loop Antenna

  24. Sporadic E at HF

  25. Louis Varney’s aerial

  26. G5RV performancewww.karinya.net/g3txq/g5rv/

  27. The ‘ZS6BKW’ multiband

  28. Yagi Uda Array

  29. V-shaped Yagi

  30. … and in conclusion

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