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This time, a devilish turnabout. I give you the Q-signal and you find the word associated with the Q-signal that completes the puzzle! Some of these you’ll have to look up, no doubt, but that’s all part of the fun. Don’t QRT early, QSL?

Across

1. QTR
5. Capacitive Reactance (symbol)
7. Percussive maintenance
10. Image transmission mode
11. QRV
13. First World continent (abbr.)
15. QRA
16. Joins three cables
17. QUA
19. Opposite of 29 Across (abbr.)
20. At right angles to elevation (abbr.)
21. Three basic component types (abbr.)
22. Non-volatile rotating storage (abbr.)
24. MN on the east, MT on the west (abbr.)
25. QRQ
27. Professional electronic designer (abbr.)
28. QSN
29. Opposite of 19 Across (abbr.)
30. Zone of antenna radiation
32. Internet messaging (abbr.)
33. Bias class
34. CW distress
36. QTH
39. QRZ
40. Small spherical shot
41. Add D to get broadband data
42. The loneliest number
44. If I am, you ...
45. Slang for robot
47. QRM
50. QNI
52. British abbreviation for high voltage
53. Transmit (abbr.)
54. Cetera
55. What the piper gets
57. Have this and eat it, too
61. CW prosign meaning standing by for only one station
62. Organization that issues 4U prefixes (abbr.)
63. QRX
65. Grid current (symbol)
66. QSX
67. All those in favor
68. National emergency test (abbr.)
69. Trade name for CTCSS tones
70. Prefix of the Emerald Isle

Down

2. Conjecture
3. QTC
4. Qualifier for license
5. Prefix of our southern neighbor
6. Furry pet
7. Opposite wiring from delta
8. QTA
9. QRL
11. QRK
12. Holdups in project completion
13. Opposite of NS
14. QSL
18. Mistake
21. Light (abbr.)
23. Exhibit
24. Places to sit in the shack
26. QRS
31. Place inside of
35. What the librarian says
37. QRT
38. QRU
40. QSK
43. Needs a control
44. CW prosign for end of message
45. Wager
46. Business end of the tower
48. Between inch and yard (abbr.)
49. QNX
50. QSP
51. It pours when it does this
56. QCX
58. Prefix meaning opposite
59. Very long time
60. Agency that registers tall towers (abbr.)
61. Collections of parts to build equipment
64. Companion to Si (chemical symbol)