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Directional Coupler Theme Crossword Puzzle
September 12, 2021

This week's crossword puzzle has an RF Directional Coupler theme in that many of the words are related to the devices. All of the other words are, as usual, pulled from a custom-built dictionary containing only terms pertaining to engineering, mechanics, astronomy, mathematics, chemistry, and names of companies that make components for the aforementioned fields. Even Dilbert characters appear sometimes. You will not, however, find names of numbnut Hollywierd celebs or TV shows here.

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

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

RF Directional Coupler Theme Crossword Puzzle for September 12, 2021 - RF Cafe

Note: A standard for crossword puzzles is when all words in a clue are capitalized, the solution is the abbreviation or acronym for that clue; e.g., Alternating Current = AC.

1. Type of directional coupler

5. Analog-to-Digital (abbr.)

7. Chemical symbol for silicon

9. One type of construction used for directional couplers (with 33 Down)

13. Flash caused by an electric current ionizing a gas or vapor

14. Flip-flop control input (pl.)

15. Frequency Division Duplex

16. Test document for verifying proper function (abbr.)

19. Volt-ohmmeter (abbr.)

21. Chemical symbol for bromine

22. Circuit path with very high or infinite impedance

23. Weight (abbr.)

26. RF power sampling device

29. One sampling port of a directional coupler

32. Morse Code for "from"

34. Switch position

35. A mathematical quantity that has both direction and magnitude

36. Exponent that returns the original number

37. Chemical symbol for manganese

40. Modern battlefield technique (abbr.)

42. _____ _____ - popular author on engineering situations (first & last name)

46. Chemical symbol for cesium

47. Million multiply accumulate operations (abbr.)

48. Unit of inductance (abbr.)

49. 300 Hz to 3 kHz in audio (abbr.)

50. Chemical symbol for polonium

51. Computer monitor (abbr., pl.)

52. Chemical symbol for einsteinium

53. Evangelista __________, inventor of the mercury barometer

56. European equivalent to the U.L.

59. Unit of liquid measure (abbr.)

60. Negative temperature coefficient (abbr.)

63. PC Card - with 68 pin interface

65. Amateur Radio Association (abbr.)

67. Chemical symbol for tin

69. One sampling port of a directional coupler

71. Lowest operational frequency of a waveguide (pl.)

73. Type of component package (abbr.)

74. Charged particles

75. Chemical symbol for thallium

76. Greek letter

79. Upper Sideband (abbr.)

80. Type of digital filter (abbr.)

82. Radio navigation reference signal

84. Very large unit of apparent power (abbr.)

86. A common use for a directional coupler

87. Yard (abbr.)

88. 1e-6 mA

89. Typical bandwidth of a directional coupler

1. Generated a form of energy arising from the kinetic energy of atoms and molecules

2. Chemical symbol for radium

3. International Reply Coupon (abbr.)

4. Type of power distribution system proposed by Thomas Edison (abbr.)

5. Chemical symbol for argon

6. He invented the triode vacuum tube

7. Engineering university located in Palo Alto, CA

8. Network department (abbr.)

9. 30 kHz to 300 kHz

10. User Datagram Protocol

11. Chemical symbol for mendelevium

12. Reduce the amount of response overshooting

17. Internet address (abbr.)

18. A measurement application of a directional coupler (abbr.)

20. 12 inches

21. Filter type (abbr.)

24. Base of the binary number system

25. Length times width

27. Unit of capacitance (abbr.)

28. 1.602E-19 Joules

30. Type of logic gate

31. Army-Navy specification prefix

33. One type of construction used for directional couplers (with 9 Across, or "Distributed")

37. Network controllers

38. Reflected radar or sonar signal (pl.)

39. Generalized Multiprotocol Label Switching (abbr.)

41. Akin to WAC, only just in America

42. Surface Mount Technology

43. Television Interference (abbr.)

44. Scheme to maintain proper frequency (abbr.)

45. Semiconductor On Insulator (abbr.)

46. Error checking scheme (abbr.)

54. Opposite of transmitted

55. Base transceiver station equipment manufacturer

57. Sharp bend in I-V curve

58. With 66 Down, the world's best engineering website

59. Unit of liquid volume (pl.)

61. Boob tube (abbr.)

62. World's largest yearly convention of gadget and device manufacturers (abbr.)

63. Unit of time (abbr.)

64. Chemical symbol for gold

65. Online service

66. With 58 Down, the world's best engineering website

68. 1/2 of a byte

70. Common average used for sinewaves (abbr.)

72. Logic family (abbr.)

77. Lubricant

78. Common plastic insulation type (abbr.)

80. Internet protocol (abbr.)

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

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

83. 1e-6 mA

84. Chemical symbol for molybdenum

85. PC follower

See solution below


2021 Crosswords 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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RF Directional Coupler Theme Crossword Solution, September 12, 2021 - RF Cafe

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