1. Ken Konechy W6HHC1 Antenna Modeling software …teaches you more about antennas …how to design better antennas …how to predict antenna performance …how to “tune” for performance …lets you try “what if….”

2. Ken Konechy W6HHC2 “What is Antenna Modeling?” it is NOT making tiny models it is a computer program to predict and analyze antenna performance

3. Ken Konechy W6HHC3 “What is Antenna Modeling SW?” Allows you to describe your antenna Allows you to describe your antenna height Allows you choose construction materials Allows you to describe your ground conditions Allows you to analyze gain Allows you analyze impedance / SWR Allows you to predict “band-width” Allows you to plot directivity & front-to-back

4. Ken Konechy W6HHC4 Example of an Antenna Modeling Program Describing a 10M 2-El Beam

5. Ken Konechy W6HHC5 Example of an Antenna Modeling Program Select Material for a 10M Dipole

6. Ken Konechy W6HHC6 Example of an Antenna Modeling Program Select “ground conditions” for a 10M Dipole NO GROUND – “free space conditions” PERFECT GROUND – “ The perfect world is simulated” SOMMERFELD GROUND – “Choose many real conditions” REAL GROUND – “Complex, allows nearby cliffs, hills, etc.”

7. Ken Konechy W6HHC7 Example of an Antenna Modeling Program Select “Sommerfeld ground conditions”

8. Ken Konechy W6HHC8 Example of an Antenna Modeling Program Gain plots for a 6-EL 20M Beam

9. Ken Konechy W6HHC9 Example of an Antenna Modeling Program Predicting SWR for a 10M Dipole at 20ft

10. Ken Konechy W6HHC10 Let us Explore a 10M Dipole Gain plots for 10M Dipole over different grounds Height = 20 ft

11. Ken Konechy W6HHC11 Let us Explore a 10M Dipole Gain plots for 10M Dipole at different heights Over Sandy ground

12. Ken Konechy W6HHC12 Let us Explore a 10M Dipole Gain plots for 10M Dipole at 5 degree Elev 10.7 dB of the gain is lost at 5 degrees!!!!!!

13. Ken Konechy W6HHC13 Let us Explore a 2-EL 10M Beam Gain plots for 10M Beam at different heights

14. Ken Konechy W6HHC14 Explore Antenna Model for 2M J-Pole J-Pole with “no pipe” – Gain = 5.77 dB

15. Ken Konechy W6HHC15 Antenna Model for 2M J-Pole Four J-Poles with “6-in pipe” to “25-in-pipe”

16. Ken Konechy W6HHC16 Antenna Model for 2M J-Pole J-Pole with “9.5 ft conductive pipe” – Gain = 4.3 dB (-1.5 dB loss from no pipe)

17. Ken Konechy W6HHC17 Antenna Model for 2M J-Pole Last month we asked whether the length of support of J-Pole made difference?? Can it be longer than 6 inches?? The J-pole model showed that gain decreased when pole was 19 in, 25 in & 9.5ft I have not yet tried whether grounding the support pole also has an impact on gain…I will now guess…”yes”

18. Ken Konechy W6HHC18 Different Antenna Modeling SW NEC2 – was designed by Lawrence Livermore Labs Win-NEC-Plus – uses NEC2 “core” SW with GUI - by L. B. Cebik, W4RNL - www.nittany-scientific.com EZNEC - uses NEC2 “core” software with GUI - by Roy Lewallen, W7EL - www.eznec.com MINI-NEC – simplified NEC2 to run on slow PCs - fairly obsolete, inaccurate

19. Ken Konechy W6HHC19 ARRL Class on Ant Modeling If you want to learn how to use NEC2 ARRL offers class beginning each month. On-line Internet class is 16 weeks long 3 hours per week On-line tutor for help and grading Cost $85

20. Ken Konechy W6HHC20 Antenna Modeling software The End Any Questions??