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Electronics Theme Crossword Puzzle
February 18, 2024

This custom RF Cafe electronics-themed crossword puzzle for February 18th contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, etc., which I have built up over more than two decades. Being the 18th day, words containing the letter "R" are marked with an asterisk (*). Many new words and company names have been added that had not even been added to the world's technical lexicon when I started in the year 2002. 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. 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.  The technically inclined cruciverbalists amongst us will appreciate the effort. A full list of all RF Cafe crosswords is at the page bottom. Enjoy!

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

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

Electronics Themed Crossword Puzzle for February 18, 2024 - RF Cafe

1. The "D" in RFID (pl.) *
4. Another name for Morse code *
15. Chemical symbol for polonium
16. Monolithic microwave integrated circuit (abbr.)
17. Internet protocol (abbr.)
18. Primary U.S. standards organization founded in 1918 (abbr.)
20. Basic element
22. The scalar component of velocity
24. Direct Memory Access (abbr.)
25. 1e-6 mA
26. European equivalent to the U.L.
27. Coder/decoder (abbr.)
29. Length times width *
31. Chemical symbol for silver
32. Apollo 11 astronaut ____ Armstrong
34. Alter the relations between the parts of a structure or shape by applying an external force *
38. Type of current flow (abbr.)
39. The design component of total product cost (abbr.) *
40. European Telecommunications Standards Institute (abbr.)
41. Indium phosphide (abbr.)
43. Adjust a pot
44. 10E1 numerical prefix
45. Radio Amateur Satellite Corporation (abbr.)
46. Chemical symbol for calcium
47. Test point (abbr.)
49. Opposite of I.D.
51. Chemical symbol for scandium
53. European space probe which visited Halley's comet
55. Rotary electrical transformer used for measuring degrees of rotation (pl.) *
57. Peripheral Component Interface (abbr.)
59. Low- to mid- frequency connectors
61. Archaic term for an outdoor antenna *
63. Stock symbol for RF Micro Devices *
66. Sound frequency in the human hearing range (abbr.)
68. The "E" in FET
72. Ratio of circumference to diameter
73. Chemical symbol for strontium *
74. Which mathematical curve is the locus of the centers of curvature of another curve
76. Weight (abbr.)
78. Chemical symbol for selenium
80. Trigonometric function equal to the ratio between the side adjacent to a given angle, and the hypotenuse
81. Chemical symbol for lawrencium *
82. Online auction site
83. Change from a "1" to a "0"
85. Light ray
87. 30 Hz to 300 Hz
88. Types of power supplies *
92. Type series expansion, named after the man who developed it *
96. Intermodulation (abbr.)
98. Opposite of a LO
99. Chemical symbol for beryllium
100. Chemical symbol for scandium
102. It has units of degrees or radians
105. Chemical symbol for manganese
106. Communication between stations by reflecting the radio waves off of the ionosphere
108. Cellphone band just below PCS
109. Common shorthand reference for a capacitor (pl.)
111. Electronic warfare defense (abbr.)
112. Akin to an EE, CE, AE, etc.
113. The "A" in DARPA
115. Audio Frequency Shift Keying (abbr.)
116. Chemical symbol for molybdenum
117. Fairchild Advanced Schottky TTL (abbr.)
119. Front end of a rocket (pl.)
122. Chemical symbol for neon
123. Semiconductor and calculator company (abbr.)
124. International Reply Coupon (abbr.) *
125. The highest numerical exponent describes this property of a polynomial *
130. Universal Asynchronous Transmit/Receive (abbr.) *
131. Small representative graphic
133. Chemical symbol for iron
135. High-speed multimedia (abbr.)
136. A measure of receiver quality (abbr.)
137. Contactless homemade (usually) inductive and/or capacitive test cable end for tracing wireless signals on a PCB or in a chassis (2 ltrs. + 2 wds., pl.) *
138. Equipment *
1. Having a chemically induced effect *
2. Apple's popular media playing device
3. Weatherproof cover for a radar antenna (pl.)
4. Common average used for sinewaves (abbr.) *
5. Unit of current
6. Singulated piece of IC wafer
7. Current-voltage phase mnemonic
8. Boob tube (abbr.)
9. International phonetic alphabet letter "L"
10. Governmental agency that monitors pollution (abbr.)
11. Useful distance between Tx and Rx (pl.) *
12. Automatic network analyzer (abbr.)
13. Unit of time (abbr.)
14. Opposite of a LO
19. Measure of a component's or system's likelihood of not failing *
21. Part of a FOR loop
23. 10E1 numerical prefix
24. 10E1 numerical prefix
26. Complex Instruction Set Computer
28. A common RS-232 serial bus command (abbr.)
30. Integrated transmitter and receiver (transceiver) at a station used for communication (pl.) *
31. Strong cable covering *
32. On-the-air meeting of hams at a set time, day and radio frequency (pl.)
33. Radio signals from the cosmos (abbr.)
35. Frequency at which XL = XC (pl.) *
36. PC follower
37. Current summing point
39. 1e-6 mA
42. Permeability-tuned oscillator (abbr.)
48. Chemical symbol for platinum
49. Type of logic gate (pl.) *
50. 1.602E-19 Joules
52. Printer output resolution unit (abbr.)
54. Chemical symbol for terbium
56. Point at which a further increase in one variable produces no further increase in the resultant effect *
58. Common shorthand reference for a capacitor
60. Chemical symbol for californium
62. Martin ____, "Test & Measurement World" magazine editor (c2009) *
63. Electron beam pattern method used in CRTs (2 wds., pl.) *
64. 1E6 nanoseconds
65. Aerodynamic opposition to thrust *
67. Television Interference (abbr.)
69. Upper frequency (abbr.)
70. Network file transfer protocol (abbr.)
71. BS__ - the degree held by many RF Cafe visitors
74. Chemical symbol for einsteinium
75. Switch position
77. Chemical symbol for terbium
79. End of Life (abbr.)
81. Front edge of a wing (abbr.)
84. Ground fault interrupter (abbr.)
85. Broadband Signal Intrusion (abbr.)
86. 1/000 of an amp (abbr.)
89. Radio term for "Will Comply"
90. Semiconductor and calculator company (abbr.)
91. Moon of Saturn discovered in 1672 *
93. Chemical symbol for ytterbium
94. Semiconductor lamp
95. Fundamental electrical component w/units of ohms *
97. Waveform limit definition
101. RF ____, the world's best engineering website *
103. Constellation : The twins
104. Electromagnetic (abbr.)
105. Million multiply accumulate operations (abbr.)
106. Chemical symbol for helium
107. The cell band above DCN
110. Unit of time (abbr.)
114. Name the English scientist who first performed the famous double slit experiment and also played a major role in deciphering the Rosetta Stone
117. Release control over *
118. Part of a FOR loop
120. Fail-____ switch
121. Chemical symbol for erbium *
123. Unit of weight
124. Type of secondary radar system (abbr.)
126. Greek letter *
127. 2 x SSB
128. Using Earth's natural satellite as a passive reflector to establish a signal path (abbr.)
129. Common average used for sinewaves (abbr.) *
131. Band between RF and BB
132. Chemical symbol for cesium
134. Filter type that blocks lower frequencies (abbr.)

See solution below
2024 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.

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April 7

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March 24

March 17

March 1967 Radio-Electronics Puzzler

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January 14

January 7














Electronics Theme Crossword Puzzle Solution for February 18, 2024 - RF Cafe 

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    Kirt Blattenberger,


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

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