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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 typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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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.

ACROSS DOWN
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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December 26

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December 12

December 5

November 28

November 21

November 14

November 7

October 31

October 24

October 17

October 10

October 3

September 26

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September 12

September 5

August 29

August 22

August 15

August 8

August 1

July 25

July 18

July 11

July 4

June 27

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May 2

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April 18

April 11

April 4

March 28

March 21

March 14

March 7

February 28

February 21

February 14

February 7

January 31

January 24

January 17

January 10

January 3

 

 

 

 

 

 

 

 

 

 

 

 

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

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