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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

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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Science & Math Theme Crossword Puzzle
April 18, 2021

This Science & Math Crossword Puzzle for April 18th has many words and clues related to RF, microwave, and mm-wave engineering, optics, mathematics, chemistry, physics, and other technical subjects. As always, this crossword contains no names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort unless it/he/she is related to this puzzle's technology theme (e.g., Reginald Denny or the Tunguska event in Siberia). The technically inclined cruciverbalists amongst us will appreciate the effort. Enjoy!


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

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

Science & Math Theme Crossword Puzzle for April 18th, 2021 - RF Cafe

ACROSS DOWN
1. A system of digital communication whereby information is transmitted in short bursts (2 wds.)

8. Continuous Tone Coded Squelch System (abbr.)

12. Electron beam pattern method used in CRTs (2 wds., pl.)

20. Chemical symbol for silver

21. Opposite of I.D.

22. Sound frequency in the human hearing range (abbr.)

23. Modulation technique that varies the width of pulses in a train (abbr.)

24. Electromagnetic interference (abbr.)

26. Test point (abbr.)

27. A BPF specification (abbr.)

28. Centimeter (abbr.)

30. Computer messaging service (pl.)

33. Intentionally block communications signals

35. Chemical symbol for lawrencium

37. Unit of time (abbr.)

39. Conductor size unit (abbr.)

42. CRT electron beam scan type

45. Chemical symbol for molybdenum

46. Cause a voltage or current waveform to gradually die out

47. Galilean moon

48. Output intercept point (abbr.)

50. Chemical symbol for thulium

51. Cause the temperature to drop

53. Chemical symbol for erbium

54. Chemical symbol for bismuth

56. Schematic label for voltage supply node

57. Device for linearly adding two or more inputs

60. Web's most popular radio frequency engineering site (2 ltrs. + 1 wd.)

63. Printer resolution abbreviation

65. Chemical symbol for platinum

67. Angle having more than 180 degrees but less than 360

68. Chemical symbol for silicon

69. Chemical symbol for silicon

70. Multifunctional silicon devices (abbr.)

71. Front edge of a wing (abbr.)

72. Formed into a specific shape

73. Unix, Linux or Windows (abbr.)

74. Exponent that returns the original number

76. The ringed planet

78. What kind of mathematical quantity has magnitude, but no direction

81. Stock symbol for Advanced Micro Devices

83. Decimeter (abbr.)

84. Chemical symbol for gadolinium

87. Teflon (abbr.)

89. Chemical symbol for einsteinium

90. Global System for Mobile Communications (abbr.)

92. Chemical symbol for xenon

93. Automatic Packet Position Reporting System (abbr.)

96. Intel x86 command for " jump if above"

97. A false signal produced in a superheterodyne receiver’s circuitry (pl.)

101. Specialized mobile radio (abbr.)

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

103. Chemical symbol for erbium

104. Decibels above or below a dipole antenna (abbr.)

105. Describes an amplifier capable of tolerating any complex source/load impedance

108. Start frequency (abbr.)

109. Electrical safety organization (abbr.)

111. Abbreviation for minimum voltage

113. "Texting" (abbr.)

116. 1/000 of an inch

118. Unit of apparent power (abbr.)

119. Amateur radio operator who is qualified to administer Amateur Radio licensing examinations (abbr.)

120. Filter type that blocks frequencies in a specified band (abbr.)

121. Layers of a multi-layered PCB

122. Balun with both ports unbalanced (pl.)

123. Popular software language from Borland -- now Embarcadero (2 wds.)

2. A common battery cell size

3. Common gateway interface (abbr.)

4. Electrical overstress (abbr.)

5. Time delay (abbr.)

6. Causes a voltage or current waveform to gradually die out

7. Band between RF and BB

8. Pure carrier (abbr.)

9. Chemical symbol for thulium

10. Chemical symbol for selenium

11. Type of component package (abbr.)

13. PC follower

14. Satellite milieu

15. Microwaves & __ magazine

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

17. Automatic Calibration System (abbr.)

18. Nordic Mobile Telephone

19. Type of coaxial transmission line with solid outer shielding

23. Type of data storage IC (abbr.)

25. Stock symbol for Intel

29. Expose to ionizing electromagnetic energy

31. Chemical symbol for molybdenum

32. Chemical symbol for lithium

33. Cable protective covering (pl.)

34. Modulation type (abbr.)

35. Diode circuit to restrain voltage input

36. Semiconductor and calculator company (abbr.)

38. Less than

40. Write-Once (abbr.)

41. "The father of rocketry"

43. Chemical symbol for arsenic

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

46. Type of current

48. Using a logical connection scheme for redundant power supplies

49. Geometric solid having two ends which are similar, equal, and parallel rectilinear figures, and sides which are parallelograms

52. Filter type that blocks upper frequencies (abbr.)

54. Beat frequency oscillator (abbr.)

55. Precision landing system (abbr.)

56. Variable crystal oscillator (abbr.)

58. Country of RF Cafe's residency

59. Resistive component of a capacitor's lumped element model (abbr.)

61. U.S. Spectrum allocation agency

62. Finite Element Analysis (abbr.)

64. Intermodulation distortion (abbr.)

65. Programmable Logic Device (abbr.)

66. Time Division Multiplexing

75. Chemical symbol for neptunium

76. Electro-mechanical control device

77. A compiler directive

79. Wheel attachment point

80. Aircraft tracking system

82. 1E6 nanoseconds

85. Decimeter (abbr.)

86. Electronics manufacturer with "meatball" logo

88. Type of modulation (abbr.)

91. Chemical symbol for scandium

94. Chemical symbol for lead

95. Chemical symbol for holmium

96. JavaScript (abbr.)

98. Colorado Springs military school (abbr.)

99. Global System for Mobile Communications (abbr.)

100. Hub of the solar system

105. Government program to bring electricity to farms (abbr.)

106. Largest broadcaster in the UK (abbr.)

107. Country of RF Cafe's residency

110. Chemical symbol for lanthanum

112. Chemical symbol for manganese

114. Greek letter (micro)

115. Chemical symbol for tin

116. Chemical symbol for manganese

117. Network department (abbr.)

118. Volume unit (abbr.)

119. Abbreviation for peak voltage


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 5

November 28

November 21

November 14

November 7

October 31

October 24

October 17

October 10

October 3

September 26

September 19

September 12

September 5

August 29

August 22

August 15

August 8

August 1

July 25

July 18

July 11

July 4

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April 18

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April 4

March 28

March 21

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February 21

February 14

February 7

January 31

January 24

January 17

January 10

January 3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Science & Math Theme Crossword Solution for April 18th, 2021 - RF Cafe

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