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RF Cafe Engineering & Science Crossword Puzzle
December 29, 2019

This week's puzzle features a special end-of-the decade message, comprised of three words and clues, for RF Cafe visitors. 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 29, 2019 - RF Cafe 

<click for full size to print>

1. Vacuum tube element that generates free electrons for current flow

5. German physicist after whom the uncertainty principle is named

12. PC follower

13. Chemical symbol for aluminum

15. 300 Hz to 3 kHz in audio (abbr.)

16. Mr. de Forest's first name

17. Computer monitor resolution measure (abbr.)

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

20. Atmospheric condensation cool surfaces

21. Digital voltmeter (abbr.)

23. Attenuator (pl.)

25. Lights

28. CB slang for CB radio or antenna

29. Ham-ese for Young Lady

30. Telex-Over-Radio (abbr.)

31. Run through compliance testing

33. Nikola _____

35. Stock symbol for Lockheed Martin

36. Radio Direction Finding (abbr.)

38. Chemical symbol for radium

39. Logarithmic ratio (abbr.)

41. Opposite of a LO

42. Online auction site

44. Thin layer of material deposited a surface

45. Internet protocol (abbr.)

46. Unit of frequency (archaic, abbr.)

47. Chemical symbol for terbium

48. The cell band above DCN

50. Innovative Power Products, Holbrook, NY (abbr.)

52. Microprocessor vendor

55. Mated to a receptacle

56. Permeability-tuned oscillator (abbr.)

57. Modulation type (abbr.)

59. With 38 Down, this website's title

61. Effect (named after its discoverer) that is the variation in the width of the base in a BJT due to a variation in the applied base-to-collector

63. The Brits call it a valve

65. Stock symbol for Raytheon

66. End of Life (abbr.)

67. Chemical symbol for gold

68. Akin to EEs, CEs, AEs, etc. (abbr., pl.)

69. Electromagnetic interference (abbr.)

70. Unit of inductance (abbr.)

72. Chemical symbol for strontium

73. Army-Navy specification prefix

74. Determined the similarity of two waveforms as a function of a time

75. Software device for tracking elapsed time (pl.)

1. _____ + 9 Down + 14 Down!

2. Radio signals from the cosmos (abbr.)

3. Transformer interwinding connections

4. Voltage-current phase mnemonic

6. 1.602E-19 Joules

7. Band between RF and BB

8. Form of energy involving the flow of electrons

9. 1 Down + ___ + 14 Down!

10. Chemical symbol for beryllium

11. An abbreviation for "receiver"

14. 1 Down + 9 Down + ____!

17. Chemical symbol for palladium

19. Electromagnetic (abbr.)

21. 24 hours

22. Degree of IC sophistication (abbr.)

24. Brightest star in the Aquila constellation

25. Inductor inserted into antenna element to increase the effective electrical length (2 wds.)

26. Modulation technique (abbr.)

27. Adjust a pot

28. The "E" in FET

30. Chemical symbol for thallium

32. Opposite of O.D.

34. Measure a waveform at regular intervals

37. Powerful mathematics software used by engineers

38. With 59 Across, this website's title

40. Filter type that blocks frequencies below and above a specified band (abbr.)

41. 1/100 meter (abbr.)

43. Chemical symbol for ytterbium

49. Chemical symbol for copper

50. U.K. equivalent of the IEEE

51. BlackBerry or Palm for example (abbr.)

53. Chemical symbol for nobelium

54. Special diode type that can be switched (abbr.)

55. Circuit for firing a radar magnetron (abbr.)

56. Mate to a socket

58. A type of average (pl.)

60. Prefix for 10E-18

62. Chemical symbol for radium

63. Short for terminal

64. Unit of time (abbr.)

66. Using the moon as a passive reflector to establish a signal path; moonbounce (abbr.)

68. Degree of IC sophistication (abbr.)

69. Chemical symbol for erbium

70. Unit of length (abbr.)

71. Chemical symbol for helium

73. Chemical symbol for argon

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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A cruciverbalist is a person who is skilled at creating or solving crossword puzzles. The term is a combination of "cruci-" from "crucifix," meaning cross, and "verbalist" from "verbal," indicating a person who deals with words. cruciverbalists are often responsible for designing crossword puzzles, and they possess a deep knowledge of wordplay, vocabulary, and the techniques used in constructing and solving crosswords. They aim to make puzzles that are both challenging and enjoyable for crossword enthusiasts.

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Engineering & Science Crossword Solution December 29, 2019 - RF Cafe

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