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"Xi Restored" Engineering Crossword Puzzle
November 21, 2021

Due respect is paid throughout this technically themed crossword puzzle to the Greek letter "Xi," which has been dissed by the World Health Organization by omitting it from the succession of designations for new COVID-19 variants (look for an asterisk after the clue). Xi has been restored to its rightful place as the 14th letter in the Greek alphabet. Only clues and words are directly to RF, microwave, and mm-wave engineering, optics, mathematics, chemistry, physics, and other science 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

"Xi Restored" Engineering Crossword Puzzle for November 28th, 2021 - RF Cafe

1. Replaced smoke signals
6. Causes circuit path with very low or 0 ohms of impedance
9. High-speed logic family
13. Write-Once (abbr.)
14. Type of flip-flop
15. Chemical symbol for californium
16. Greek letter which comes after Nu*
17. Hub of the solar system (pl.)
18. Write-Once (abbr.)
20. Creates an impenetrable physical barrier
25. 10E-1 numerical prefix
27. Network department (abbr.)
28. Greek letter which comes before Omicron
29. Current-voltage phase mnemonic
31. Transmitter interference (abbr.)*
32. An abbreviation for "transceiver"
34. Change connector type
36. Amateur radio abbreviation for the Oceania region (abbr.)
39. Chemical symbol for calcium
40. Upper frequency (abbr.)
41. Chemical symbol for ruthenium
43. Satellite of Jupiter discovered by Galileo
45. Chemical compound containing at least one oxygen atom as well as at least one other element (pl.)*
46. Greek letter recently dissed by WHO
47. PC follower
48. Chemical symbol for lutetium
53. Its chemical symbol is Po
55. Shorthand for oxygen
57. Wire mesh wrapped around center conductor (pl.)
58. The __ baryon is a family of subatomic hadron particles*
59. Brightness of a star
60. Type of matrix barcode used with laser scanning(abbr.)
62. Chemical symbol for tin
63. Project box
67. Switch position
69. Name the Scottish physicist who developed the theory of electromagnetism
73. The Greek letter often used as a symbol for potential difference*
74. Constellation : The scorpion
76. Chemical symbol for manganese
77. Test equipment (abbr.)
78. Sigma __, the Scientific Research Honor Society*
79. CB slang for accelerator pedal
81. The imaginary part of a complex quantity
85. Local Oscillator (abbr.)
86. Opposite of O.D.
87. This crossword's celebrated Greek letter*
89. The notorious "missing COVID-19 variant
90. Balanced-to-unbalanced device
92. Complex Instruction Set Computer
93. Transmit Incremental Tuning (abbr.)*
95. Period between radar transmitter's output waveform (abbr.)
97. Greek letter indicating "no change" in Z notation*
98. Chemical symbol for einsteinium
99. Field Programmable Gate Array (abbr.)
100. Rechargeable battery type (abbr.)
102. Greek letter representing a universal set in Set Theory*
103. Elemental compound used for microwave frequency reference oscillators (abbr., pl.)
105. Greek letter used for the Correlation Function in astronomy*
106. Chemical symbol for rhodium
107. Akin to an EE, CE, AE, etc.
108. Chemical symbol for scandium
110. Semiconductor lamp
111. It connects the software to the hardware
112. System for communicating between areas of a building or vessel (pl.)
2. Modern battlefield technique (abbr.)
3. Line of Sight (abbr.)
4. Type of logic gate (pl.)
5. Unit of time (abbr.)
6. Parameter that is a figure of merit for receiver performance in presence of multiple signals (abbr.)
7. Receiver interference (abbr.)*
8. Semiconductor and calculator company (abbr.)
9. Chemical symbol for europium
10. Stock symbol for Conexant
11. Family of ICs with a certain component density level (abbr.)
12. Makes and breaks circuits
17. Network configuration type (pl.)
19. Amateur radio abbreviation for the Oceania region (abbr.)
21. Radio signals from the cosmos (abbr.)
22. x, y, or z on Cartesian coordinates*
23. Chemical symbol for lithium
24. Schematic label for voltage supply node
26. Constellation : The southern cross
27. Opposite of O.D.
30. End of Life (abbr.)
33. Unit of apparent power (abbr.)
34. Mr. DeForest's first vacuum tube amplifier
35. Chemical symbol for plutonium
37. Chemical symbol for chlorine
38. BASIC program command
40. Online venue for posting comments & reading replies (pl.)
42. _____-wise linear
44. Transformer interwinding connections
48. Shorthand for liquid oxygen
49. International phonetic alphabet letter "U"
50. International Telecommunications Union
51. 14th letter in the Greek alphabet*
52. Chemical symbol for aluminum
54. ELI the ICE ___
56. Greek letter often used as a symbol for damping ratio*
60. Ham's code for "Shall I send more slowly?"
61. Basic storage unit of a database
63. 2-part adhesive
64. Mr. Piper's famous yellow airplane
65. Shorthand for oxygen
66. Unit of conductance
68. Silicon transistor type (abbr.)
69. BSEE + 2 years
70. The Riemann __ is a simplified form of the Riemann Zeta function*
71. Equalizer (abbr.)
72. Powerful, rapidly varying infrared source
75. UMTS terrestrial radio access (abbr.)
79. Majority carriers in p-type material
80. Antenna radiated power measurement (abbr.)
82. Application Specific Integrated Circuit (abbr.)
83. Mate to an RX
84. Input intercept point (abbr.)
85. Chemical symbol for lanthanum
87. See 87 Across
88. FCC Part 15 rules apply in this band (abbr.)
90. Eight bits
91. Unit of time (abbr.)
92. Mr. Gauss' first name
93. It has the value of 60 in Greek numerals*
94. Chemical symbol for tantalum
96. Mate to a TX
97. Amateurese for "wife"
99. Type of digital filter (abbr.)
100. On-the-air meeting of hams at a set time, day and radio frequency
101. Digital storage oscilloscope (abbr.)
104. Opposite of I.D.
105. Chemical symbol for xenon
107. Chemical symbol for manganese
109. Centimeter (abbr.)

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

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.

2024 | 2023 |2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | Sudoku


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.

December 26

December 19

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December 5

November 28

November 21

November 14

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October 17

October 10

October 3

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August 29

August 22

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August 1

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"Xi Restored" Engineering Crossword Solution for November 28th, 2021 - RF Cafe

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