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Antennas Frank Donovan, W3LPL

Antennas Frank Donovan, W3LPL. Antenna Secrets of the Top Multi-Op Stations Revealed !. How do the top multi-op stations break those huge pileups so fast? How do they consistently make 5000 to 8000 QSOs in one weekend ? Of course, they have great operators, full legal power,

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Antennas Frank Donovan, W3LPL

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  1. Antennas Frank Donovan, W3LPL

  2. Antenna Secrets of the Top Multi-Op Stations Revealed ! How do the top multi-op stations break those huge pileups so fast? How do they consistently make 5000 to 8000 QSOs in one weekend ? Of course, they have great operators, full legal power, great locations, and they’re really serious competitors... But that’s not enough ! Its not even close... They all use stacked monoband Yagis at carefully chosen heights But the most competitive multi-ops do much more… The antenna secrets of the Top Multi-ops... And tips to apply to your own station!

  3. Secret #1: Use All of the Right Angles Do your antennas cover all of these elevation angles? The top multi-ops cover them all (or almost all…) Europe Asia/Pacific 80M 10 - 30 deg (100 - 200 ft) 7 - 18 deg (150 - 200 ft) 40M 7 - 23 deg (100 - 200 ft) 5 - 15 deg (120 - 200 ft) 20M 5 - 18 deg (75 -100 ft) 4 - 12 deg (100 - 200 ft) 15M 4 - 15 deg (60 - 90 ft) 3 - 10 deg (90 - 200 ft) 10M 3 - 12 deg (50 - 80 ft) 2 - 8 deg (80 - 200 ft)

  4. Secret #1: Use All of the Right Angles Of course, its extremely difficult to cover all of the right angles So… Tip #1: Design your antennas for as many of the right angles as you can. A good compromise is: 50 - 100 feet for Europe 80 - 100 feet (plus) for Asia/Pacific

  5. Secret #2: Eliminate Radiation Pattern Nulls Low antennas have clean radiation patterns - with no nulls - but poor low angle radiation

  6. 5 Element 20 Meter Yagi on 48 Foot Boom, 50 Feet High 18 degrees No nulls... Europe degrees 50 FT Poor low angle radiation 5 degrees decibels

  7. 5 Element 20 Meter Yagi on 48 Foot Boom, 50 Feet High No nulls... 12 degrees degrees Asia/Pacific 50 FT Poor low angle radiation 4 degrees decibels

  8. Secret #2: Eliminate Radiation Pattern Nulls High antennas produce excellent low angle radiation but have deep nulls at very important elevation angles

  9. 5 Element 20 Meter Yagi on a 48 Foot Boom, 200 Feet High 12 degrees Europe degrees Deep null Excellent low angle radiation 4 degrees decibels

  10. 5 Element 20 Meter Yagi on a 48 Foot Boom, 200 Feet High 12 degrees degrees Deep null Asia/Pacific Excellent low angle radiation 4 degrees decibels

  11. 6 Element 15 Meter Yagi on a 48 Foot Boom, 200 Feet High 15 degrees Deep null degrees Europe Deep null Excellent low angle radiation 4 degrees decibels

  12. 6 Element 15 Meter Yagi on a 48 Foot Boom, 200 Feet High 10 degrees degrees Deep null Asia/Pacific Excellent low angle radiation 3 degrees decibels

  13. 7 Element 10 Meter Yagi on a 48 Foot Boom, 200 Feet High 12 degrees degrees Deep null Europe Deep null Excellent low angle radiation 3 degrees decibels

  14. 7 Element 10 Meter Yagi on a 48 Foot Boom, 200 Feet High degrees 8 degrees Deep null Asia/Pacific Excellent low angle radiation 2 degrees decibels

  15. Secret #2: Eliminate Radiation Pattern Nulls Well designed stacked Yagis provide the best of both! - low angle radiation, and - null-free radiation patterns Tip #2: Use stacked Yagis to produce broad null-free patterns that cover the full range of needed elevation angles Stacked Yagis require a tower 70 to 100 feet tall

  16. Two Stacked 5 Element 20 Meter Yagis on 48 Foot Booms, 50 and 100 Feet High 18 degrees BOTH Europe 100’ degrees 50 FT 5 degrees decibels

  17. Two Stacked 5 Element 20 Meter Yagis on 48 Foot Booms, 50 and 100 Feet High BOTH 12 degrees 100’ degrees Asia/Pacific 50 FT 4 degrees decibels

  18. Two Stacked 6 Element 15 Meter Yagis on 48 Foot Booms, 47 and 94 Feet High 15 degrees BOTH degrees Europe 94 FT 47 FT 4 degrees decibels

  19. Two Stacked 6 Element 15 Meter Yagis on 48 Foot Booms, 47 and 94 Feet High BOTH 10 degrees degrees 94 FT Asia/Pacific 47 FT 3 degrees decibels

  20. Two Stacked 6 Element 10 Meter Yagis on 36 Foot Booms, 35 and 70 Feet High 12 degrees BOTH degrees Europe 70 FT 35 FT 3 degrees decibels

  21. Two Stacked 6 Element 10 Meter Yagis on 36 Foot Booms, 35 and 70 Feet High BOTH degrees 8 degrees 70 FT Asia/Pacific 35 FT 2 degrees decibels

  22. Two Stacked 3 Element 40 Meter Yagis on 48 Foot Booms, 100 and 200 Feet High 23 degrees Europe BOTH degrees 200’ 100 FT 7 degrees decibels

  23. Two Stacked 3 Element 40 Meter Yagis on 48 Foot Booms, 100 and 200 Feet High 16 degrees BOTH degrees Asia/Pacific 200’ 100 FT 5 degrees decibels

  24. Secret #3: Stacks for Europe and Asia are Different! Stacked Yagis that produce an optimum null-free higher angle radiation pattern for Europe… cannot produce the optimum lower angle pattern for Asia/Pacific Stacked Yagis that produce an optimum null-free low angle radiation pattern for Asia/Pacific... cannot produce the optimum higher angle pattern for Europe

  25. Secret #3: Stacks for Europe and Asia are Different! The solution is: Tip #3: Use switchable stacks of three Yagis to select broad null-free radiation patterns for either Europe or Asia/Pacific

  26. Three Stacked 5 Element 20 Meter Yagis on 48 Foot Booms; 50, 100, 150 Feet High 18 degrees 50 FT/100 FT Europe degrees 5 degrees 100 FT/150 FT decibels

  27. Three Stacked 5 Element 20 Meter Yagis on 48 Foot Booms; 50, 100, 150 Feet High 50 FT/100 FT 12 degrees degrees Asia/Pacific 100 FT/150 FT 4 degrees decibels

  28. Three Stacked 6 Element 15 Meter Yagis on 48 Foot Booms; 47, 94 and 140 Feet High 15 degrees 47 FT/94 FT degrees Europe 94 FT/140 FT 4 degrees decibels

  29. Three Stacked 6 Element 15 Meter Yagis on 48 Foot Booms; 47, 94 and 140 Feet High 47 FT/94 FT 10 degrees degrees Asia/Pacific 94 FT/140 FT 3 degrees decibels

  30. Three Stacked 6 Element 10 Meter Yagis on 36 Foot Booms; 35, 70 and 105 Feet High 35 FT/70 FT 12 degrees degrees Europe 70 FT/105 FT 3 degrees decibels

  31. Three Stacked 6 Element 10 Meter Yagis on 36 Foot Booms; 35, 70 and 105 Feet High 35 FT/70 FT degrees 8 degrees Asia/Pacific 70 FT/105 FT 2 degrees decibels

  32. Antenna Secrets of the Top Multi-Op Stations Revealed ! Secret #1: Use All of the Right Angles Secret #2: Eliminate Radiation Pattern Nulls Secret #3: Stacks for Europe and Asia are Different!

  33. Tips to Apply to Your Own Station Tip #1: Design your antennas for as many of the right angles as you can. A good compromise is: 50 - 100 feet for Europe 80 - 100 feet (plus) for Asia/Pacific Tip #2: Use stacked Yagis to produce broad null-free patterns that cover the full range of needed elevation angles Stacked Yagis require a tower 70 to 100 feet tall Tip #3:Use switchable stacks of three Yagis to select broad null-free radiation patterns for either Europe or Asia/Pacific

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