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Hams across the U.S. are rushing to render assistance to the Gulf Coast region that was devastated by Hurricane Katrina. Emergency communications, a cornerstone of amateur radio, has never been more important. This week's puzzle freshens up a previous puzzle with an emergency-communications theme. Thanks to all the ham volunteers and our sympathies to all those that have lost family, friends, and homes.

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Across

1. Country-wide system of traffic handling

4. Initial medical assistance

11. Old Man (CW)

12. Information Technology (abbr.)

13. Station that listens (abbr.)

14. Direction prevailing winds blow across the US

15. Prosign for End of Message

18. ARRL emergency organization

19. Organized methods or procedures

21. Phone signal report

24. Be quiet!

25. Home power

26. Event

31. Prefix meaning "reverse"

34. State of being powered

35. Organization that provides shelter (two words)

37. Connected together with communications

39. Helps

40. Locating a transmitter (abbr.)

41. Federal emergency organization

44. Rotate

47. When to train for a disaster

48. Local amateur emergency leader (abbr.)

49. Required to operate radios

51. Measure or exercise

53. To meet or arrive

56. Invisible light (abbr.)

57. Vehicle used for temporary living quarters

59. Ham Radio (abbr.)

60. The two types of fields (abbr.)

62. Phonetic for "A"

64. Digital data mode

65. Interference (abbr.)

67. Get moving

68. News organization (initials)

70. Determined in advance

71. Phone distress signal

72. Unit of current

73. Resists corrosion (abbr.)

Down

2. Opposite of from

3. Miniature RF connector type

4. Ham's favorite day

5. Add "K" to get something to build

6. CW distress signal

7. Leisure items (not our radios)

8. Interrupt or Internal (abbr.)

9. Boy Scouts do good ones

10. Amplifier (abbr.)

16. Civil Defense amateur organization

17. Practice

20. Reflex to something bad

22. Serial Number (abbr.)

23. Professional nursing designation

27. Direct the operation of

28. Permanent marking

29. Complete

30. Flow of information

32. Net Control Station

33. Audio signal

36. Multiply to get "R"

38. Electromagnetic (abbr.)

40. From (CW abbr.)

42. Directed communications

43. Take action

45. Where the antenna goes

46. Now (CW abbr.)

47. Signal that the channel is needed

50. Where injured people are taken

51. Rehearses for

52. Imagine

54. Region of disaster

55. Alone is male, with "S" is female

58. Data rate

61. Assist

63. Changes to a radio

66. Small unit of current

69. Final amplifier (abbr.)

70. Afternoon hours