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RF Cafe Engineering & Science Crossword Puzzle
December 15, 2019

This week's puzzle features words and clues, marked with an asterisk (*), regarding a momentous event which took place this week on December 17, 2019. As with my hundreds of previous engineering and science-themed crossword puzzles, this one contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, etc., which I have built up over nearly two decades. Many new words and company names have been added that had not even been created when I started in the year 2002. You will never find a word taxing your knowledge of a numbnut soap opera star or the name of some obscure village in the Andes mountains. You might, however, encounter the name of a movie star like Hedy Lamarr or a geographical location like Tunguska, Russia, for reasons which, if you don't already know, might surprise you.

cruciverbalist: [noun]  cruci- ("cross") +‎ verbal ("words") +‎ -ist ("agent, person") -- A person who constructs or works crosswords.

Reproduction of this puzzle without the express permission of RF Cafe is prohibited.

acr. = acronym, abbr. = abbreviation, pl. = plural, wds. = words

Engineering & Science Crossword Puzzle December 15, 2019 - RF Cafe 

<click for full size to print>

1. The "K" in ASK

6. ______ + 75 Across, the duo who made the world's first self-powered, sustained flight the took off under it own power*

11. Intermodulation (abbr.)

12. Uncharged atomic particles

13. Chemical symbol for erbium

14. Prefix meaning ground or earth

16. Logic gate

17. Prefix meaning "water"

19. Automatic Packet Position Reporting System (abbr.)

21. Miniature RF connector (pl.)

23. Amateur radio enthusiast

25. Analog-to-Digital (abbr.)

27. Be behind in phase

29. PC follower

30. ______ + 6 Across, of aeroplane fame*

31. Chemical symbol for thallium

32. Weight (abbr.)

33. Electronics manufacturer with "meatball" logo

34. Boob tube (abbr.)

35. Chemical symbol for argon

37. BS__ - the degree held by many RF Cafe visitors

38. Unit of resistance (abbr.)

42. CB slang for CB radio or antenna

44. Highest point

45. ____ Devil Hill*

46. Unintentionally change the oscillator frequency

48. Adjacent Channel Power Ratio (abbr.)

51. Chemical symbol for radium

52. Chemical symbol for scandium

54. Unit of capacitance (abbr.)

56. Word used in describing 2-D and 3-D object dimensions; i.e., 10 mm __ 25 mm

57. 10E1 numerical prefix

58. Type of logic gate

59. ______ + 6 Across, brother of 30 Across*

60. PC follower

61. Push to Talk (abbr.)

63. Cyanide (abbr.)

64. Broadband Signal Intrusion (abbr.)

65. Switch configuration (abbr.)

68. Field Programmable Gate Array (abbr.)

70. Parameter that is a figure of merit for receiver performance in presence of multiple signals (abbr.)

71. Mr. Gauss' first name

72. Additive white Gaussian noise

73. Front edge of a wing (abbr.)

75. 30 Across and 59 Across were known as the 6 Across ________*

78. S12 or S21 (abbr.)

79. Subject a circuit to extreme operation

80. Flip-flop control input (pl.)

1. _____ ____, the town in North Carolina where 30 Across and 59 Across 6 Across flew their 30 Across + 68 Down aeroplane (2 wds.)*

2. Electromagnetic (abbr.)

3. Indium Gallium Phosphor semiconductor (abbr.)

4. Chemical symbol for neon

5. Type of microwave diode (pl.)

6. An 8-bit unit (pl.)

7. Chemical symbol for radon

8. First name of a British scientist of falling apple fame

9. Chemical symbol for helium

10. Plane geometric figure having three straight sides and three angles (pl.)

15. Type of data storage IC

18. Ham's code for "Can you acknowledge receipt?"

20. Martin ____, "Test & Measurement World" magazine editor (c2009)

22. Gigantic star in Cetus

24. Prefix for 10E-18

25. ___-AZIMUTH telescope mount

26. Logarithmic unit of voltage (abbr.)

28. Automatic Testing, Evaluation & Reporting (abbr.)

33. Generalized Multiprotocol Label Switching (abbr.)

36. Electro-mechanical switching device

39. The computer in 2001: A Space Odyssey

40. Stock symbol for Texas Instruments

41. Archaic abbreviation for megavolt

43. Circuit for maintaining constant voltage (abbr.)

46. Document package submitted in attempt to win a job (pl.)

47. Universal Asynchronous Transmit/Receive (abbr.)

49. BlackBerry or Jordana for example (abbr., pl.)

50. Numbers that can be expressed as a/b, where a, b are integers

53. Not hot

54. Common plastic insulation type (abbr.)

55. Heatsink feature

56. Target indication on a radar display

62. Time division duplex (abbr.)

64. Bulk Acoustic Wave

66. Device used to make contact with a point to be measured

67. Temperature-compensated crystal oscillator (abbr., pl.)

68. The 6 Across + _____, name of the first self-powered aeroplane, that took off, and gained altitude during sustained flight*

69. Karl Friedrich _____, after whom the unit of magnetic field strength is named

74. Radio signals from the cosmos (abbr.)

76. Type of flip-flop

77. One component of a complex number (abbr.)

78. Network department (abbr.)

See solution below


2019 Crossword Puzzle Archive

Visit the Crossword Express website - RF CafeTake a well-deserved break and try your hand at some of these goodies. Every word in the RF Cafe crossword puzzles is specifically related to engineering, mathematics, and science. There are no generic backfill words like many other puzzles give you, so you'll never see a clue asking for the name of a movie star or a mountain on the Russia-China border.

All of these crossword puzzles were created using the fabulous Crossword Express (now called "Magnum Opus") software.

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Engineering & Science Crossword Solution December 15, 2019 - RF Cafe

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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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