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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
    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 typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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Science Theme Crossword Puzzle
May 23, 2021

For twenty years now, I have been creating weekly crossword puzzles for the education and enjoyment of the technically minded visitor like you. This Science Theme Crossword Puzzle for May 23rd 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 Theme Crossword Puzzle for May 23rd, 2021 - RF Cafe

1. This crossword puzzle's theme
6. ______ Marietta, or Lockheed ______
10. Filter type that blocks upper frequencies (abbr.)
11. Chemical symbol for xenon
13. Minutes of Use (abbr.)
15. Intermodulation (abbr.)
17. Common plastic insulation type (abbr.)
19. Switch position
20. Switch position
21. Chemical symbol for plutonium
22. Permeability-tuned oscillator (abbr.)
24. Trans European Trunked RAdio
25. Akin to dynamics, with no movement
26. Chemical symbol for ruthenium
28. Chemical symbol for einsteinium
30. Greek letter used for wavelength
34. Amount of deviation from nominal and still being within specification
38. Chemical symbol for arsenic
39. Low altitude earth orbit
40. Prevented the direct physical transfer of signals from one point to another
44. Things in a bill of material
46. Its chemical symbol is W
48. The "C" in CDMA
51. Read-only (abbr.)
52. Added two or more inputs
53. The "F" in EMF (pl.)
56. Chemical symbol for erbium
58. Multifunctional silicon devices (abbr.)
60. Mathematics of angles
64. Impurity in a semiconductor that adds a mobile electron in the conduction band
67. Singulated piece of IC wafer
68. Amateur radio abbreviation for the Oceania region (abbr.)
69. Opposite of O.D.
70. Chemical symbol for selenium
71. Miniature threaded RF connector
74. Greek letter (micro)
75. The computer in 2001: A Space Odyssey
77. Type of logic gate
78. Temporary Engineering Change document (abbr.)
80. First lines in software that call external libraries
81. One last instance of this crossword puzzle's theme - just to prove these are created custom-like
1. Describes when a synchronous motor loses phase lock (pl.)
2. S12 or S21 (abbr.)
3. Governmental agency that monitors pollution (abbr.)
4. A measure of receiver quality (abbr.)
5. Lay bare, such as a wire
7. Modulation type (abbr.)
8. One factor of a polynomial
9. Tweak a filter for the correct response
12. 1.602E-19 Joules
14. Rádio Nacional de Angola (abbr.)
16. Type of inductance found in transformers
18. Carrier-to-noise ratio (abbr.)
20. Used logic gates
22. Ratio of circumference to diameter
23. Coefficient of temperature (abbr.)
27. Electrical safety organization (abbr.)
29. Another instance of this crossword puzzle's theme
31. _/_-___, maker of RF semiconductors and connectors
32. Base Station Transceivers (abbr.)
33. Boolean expression (pl.)
35. One component of a complex number (abbr.)
36. What number is defined as a one followed by 100 noughts
37. Network department (abbr.)
41. Type of component package (abbr.)
42. Unix, Linux or Windows (abbr.)
43. Reliability measure (abbr.)
44. Network department (abbr.)
45. Test equipment (abbr.)
47. The design component of total product cost (abbr.)
48. Chemical symbol for copper
49. Decimeter (abbr.)
50. Type of reconfigurable memory (abbr.)
54. Apple's popular media playing device
55. Chemical symbol for silicon
57. Aircraft tracking system (pl.)
59. Unlicensed radio type for personal and business use (abbr., pl.)
61. Chemical symbol for lithium
62. Electronics manufacturer with "meatball" logo
63. An angle that has less than 90 degrees
64. Deutsche Industrie Normenausschuss
65. Workplace safety group (abbr.)
66. A disk operation
72. Chemical symbol for molybdenum
73. U.K. equivalent of the IEEE
76. Front edge of a wing (abbr.)
78. Semiconductor and calculator company (abbr.)
79. Cyanide (abbr.)

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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Science Theme Crossword Solution for May 23rd, 2021 - RF Cafe

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