Across
- 3. DX signals via ionosphere
- 5. Digital Signal Processing in receivers
- 11. Matching antenna orientation
- 14. Basis of all radio communication
- 18. Converts AC to DC in circuits
- 19. Circuit for SSB generation
- 24. Frequencies in GHz range
- 25. Reduces specific interference
- 26. Amplitude and frequency techniques
- 27. Volunteer examiner for tests
- 30. Combines signals in SSB radios
- 31. Knowledge of advanced ham resources
- 32. Matching for maximum signal transfer
- 33. Cards confirming international contacts
- 34. Modes like RTTY and FT8
- 35. Stable source for rigs
- 36. Basic and efficient antenna
- 37. Multi-band HF antenna design
- 38. Access to all amateur bands
- 39. 4 Advanced exam content for Extra Class
Down
- 1. Signal weakening over distance
- 2. HF disruption due to solar activity
- 4. Creates precise radio frequencies
- 5. Focus of antenna radiation pattern
- 6. Signal reflected by ionosphere
- 7. Efficient power transfer
- 8. Circuit used in filtering
- 9. Broadband directional antenna
- 10. Unit for signal strength comparisons
- 12. For tuning circuits
- 13. Access to orbital relays
- 15. Exclusive Extra portions of HF bands
- 16. Advanced abbreviations like QRZ and QSX
- 17. Matches radio to antenna
- 20. Oscillator for resonance testing
- 21. Generates stable frequencies
- 22. Specific frequency ranges for Extras
- 23. Yagi, quad, and long-wire planning
- 28. Design and troubleshooting focus
- 29. For sharp frequency selectivity