Left Border Content - RF Cafe
Triad RF Systems
Exodus Advanced Communications Best in Class RF Amplifier SSPAs

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.

My Hobby Website:


Header Region - RF Cafe
Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes App Notes Calculators Education Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Homepage Thank you for visiting RF Cafe!
Sub-Header - RF Cafe Exodus Advanced Communications Best in Class RF Amplifier SSPAs

RF Cafe Engineering & Science Crossword Puzzle
December 15, 2019

This week's puzzle features words and clues, marked with an asterisk (*), regarding a momentous event which took place this week on December 17, 2019. As with my hundreds of previous engineering and science-themed crossword puzzles, this one contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, etc., which I have built up over nearly two decades. Many new words and company names have been added that had not even been created when I started in the year 2002. You will never find a word taxing your knowledge of a numbnut soap opera star or the name of some obscure village in the Andes mountains. 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.

cruciverbalist: [noun]  cruci- ("cross") +‎ verbal ("words") +‎ -ist ("agent, person") -- A person who constructs or works crosswords.

Reproduction of this puzzle without the express permission of RF Cafe is prohibited.
acr. = acronym, abbr. = abbreviation, pl. = plural, wds. = words

Engineering & Science Crossword Puzzle December 15, 2019 - RF Cafe 

<click for full size to print>

1. The "K" in ASK
6. ______ + 75 Across, the duo who made the world's first self-powered, sustained flight the took off under it own power*
11. Intermodulation (abbr.)
12. Uncharged atomic particles
13. Chemical symbol for erbium
14. Prefix meaning ground or earth
16. Logic gate
17. Prefix meaning "water"
19. Automatic Packet Position Reporting System (abbr.)
21. Miniature RF connector (pl.)
23. Amateur radio enthusiast
25. Analog-to-Digital (abbr.)
27. Be behind in phase
29. PC follower
30. ______ + 6 Across, of aeroplane fame*
31. Chemical symbol for thallium
32. Weight (abbr.)
33. Electronics manufacturer with "meatball" logo
34. Boob tube (abbr.)
35. Chemical symbol for argon
37. BS__ - the degree held by many RF Cafe visitors
38. Unit of resistance (abbr.)
42. CB slang for CB radio or antenna
44. Highest point
45. ____ Devil Hill*
46. Unintentionally change the oscillator frequency
48. Adjacent Channel Power Ratio (abbr.)
51. Chemical symbol for radium
52. Chemical symbol for scandium
54. Unit of capacitance (abbr.)
56. Word used in describing 2-D and 3-D object dimensions; i.e., 10 mm __ 25 mm
57. 10E1 numerical prefix
58. Type of logic gate
59. ______ + 6 Across, brother of 30 Across*
60. PC follower
61. Push to Talk (abbr.)
63. Cyanide (abbr.)
64. Broadband Signal Intrusion (abbr.)
65. Switch configuration (abbr.)
68. Field Programmable Gate Array (abbr.)
70. Parameter that is a figure of merit for receiver performance in presence of multiple signals (abbr.)
71. Mr. Gauss' first name
72. Additive white Gaussian noise
73. Front edge of a wing (abbr.)
75. 30 Across and 59 Across were known as the 6 Across ________*
78. S12 or S21 (abbr.)
79. Subject a circuit to extreme operation
80. Flip-flop control input (pl.)
1. _____ ____, the town in North Carolina where 30 Across and 59 Across 6 Across flew their 30 Across + 68 Down aeroplane (2 wds.)*
2. Electromagnetic (abbr.)
3. Indium Gallium Phosphor semiconductor (abbr.)
4. Chemical symbol for neon
5. Type of microwave diode (pl.)
6. An 8-bit unit (pl.)
7. Chemical symbol for radon
8. First name of a British scientist of falling apple fame
9. Chemical symbol for helium
10. Plane geometric figure having three straight sides and three angles (pl.)
15. Type of data storage IC
18. Ham's code for "Can you acknowledge receipt?"
20. Martin ____, "Test & Measurement World" magazine editor (c2009)
22. Gigantic star in Cetus
24. Prefix for 10E-18
25. ___-AZIMUTH telescope mount
26. Logarithmic unit of voltage (abbr.)
28. Automatic Testing, Evaluation & Reporting (abbr.)
33. Generalized Multiprotocol Label Switching (abbr.)
36. Electro-mechanical switching device
39. The computer in 2001: A Space Odyssey
40. Stock symbol for Texas Instruments
41. Archaic abbreviation for megavolt
43. Circuit for maintaining constant voltage (abbr.)
46. Document package submitted in attempt to win a job (pl.)
47. Universal Asynchronous Transmit/Receive (abbr.)
49. BlackBerry or Jordana for example (abbr., pl.)
50. Numbers that can be expressed as a/b, where a, b are integers
53. Not hot
54. Common plastic insulation type (abbr.)
55. Heatsink feature
56. Target indication on a radar display
62. Time division duplex (abbr.)
64. Bulk Acoustic Wave
66. Device used to make contact with a point to be measured
67. Temperature-compensated crystal oscillator (abbr., pl.)
68. The 6 Across + _____, name of the first self-powered aeroplane, that took off, and gained altitude during sustained flight*
69. Karl Friedrich _____, after whom the unit of magnetic field strength is named
74. Radio signals from the cosmos (abbr.)
76. Type of flip-flop
77. One component of a complex number (abbr.)
78. Network department (abbr.)

See solution below


2019 Crossword Puzzle 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.

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

December 29

December 22

December 15

December 8

December 1

November 24

November 17

November 10

November 3

October 27

October 20

October 13

October 6

September 29

September 22

September 15

September 8

September 1

August 25

August 18

August 11

August 4

July 28

July 21

July 14

July 7

June 30

June 23

June 16

June 9

June 2

May 26

May 19

May 12

May 5

April 28

April 21

April 14

April 7

March 31

March 24

March 17

March 10

March 3

February 24

February 17

February 10

February 3

January 27

January 20

January 13

January 6
















Engineering & Science Crossword Solution December 15, 2019 - RF Cafe

Footer - RF Cafe RIGOL Technologies (electronics test equipment) - RF Cafe
Right Border Content - RF Cafe
ConductRF Phased Matched RF Cables - RF Cafe
Res-Net Microwave - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free