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RF Cafe Science & Engineering Crossword Puzzle
February 16, 2020

Here is a science and engineering-themed crossword puzzle for your next long flight or boring meeting. This one for February 16, 2020, 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 February 16, 2020 - RF Cafe 

<click for full size to print>

1. Length times width

4. An induction electromechanical device whose speed is not synchronous with the frequency of the supply line (2 wds.)

15. Complex Instruction Set Computer

18. Ham's code for "What is your location?"

20. Chemical symbol for calcium

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

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

23. Type of current

24. Amateur radio enthusiast

25. Chemical symbol for silicon

26. Programmable logic device (abbr.)

28. Term used in soldering to achieve the condition that occurs when the metals being soldered are hot enough to melt the solder so it flows over the surface

30. Decimeter (abbr.)

31. Unit of time (abbr.)

33. FCC Part 15 rules apply in this band (abbr.)

35. 3-phase transformer configuration

36. Chemical symbol for nobelium

38. Semiconductor lamp

39. Logarithmic ratio (abbr.)

41. Akin to an EE, CE, AE, etc.

42. One system's phonetic letter "z"

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

46. Finite Element Analysis (abbr.)

48. Opposite of a source (pl.)

51. Radio Amateurs of Canada (abbr.)

53. Securing devices

55. Type of high speed Internet service (abbr.)

56. Numerical prefix for 10E2

58. Semiconductor device type (abbr.)

59. Fuses metals together using heat

61. Exponent that returns the original number

62. Chemical symbol for erbium

64. Innovative Power Products, Holbrook, NY (abbr.)

66. Temperature-compensated crystal oscillator (abbr., pl.)

68. One of many similar appendages of a fan

70. Unit of energy

72. Intel x86 command for " jump if above"

73. Type of flip-flop

74. Switch position

75. Chemical symbol for strontium

76. Unit of volume (abbr.)

78. Type of current flow (abbr.)

79. Unit of inductance (abbr.)

81. Finite-Element Model

83. Chemical symbol for tin

84. Circuit configuration w/o feedback (2 wds.)

87. Its chemical symbol is Xe

90. Constellation : The lesser lion (3,5)

93. Period between radar transmitter's output waveform (abbr.)

94. System On Chip

95. Chemical symbol for tantalum

97. Lowest power level capable of being demodulated (abbr.)

98. Read-only (abbr.)

99. Attenuator

100. Negation prefix

102. The "B" in BER

104. UMTS terrestrial radio access (abbr.)

106. Primary U.S. standards organization founded in 1918 (abbr.)

108. Sample group

110. Input winding of a transformer (pl.)

111. Chemical symbol for copper

112. Network department (abbr.)

113. Keyboard character deleter key

114. End of soldering iron

115. Steady-state voltage reference

119. ECM response

122. Newest buzz phrase for ubiquitous remote control and monitoring of everything (abbr.)

123. Ham award meaning Worked All Zones

124. Facility where semiconductors are manufactured

126. Cyanide (abbr.)

127. Hub of the solar system

129. Radio signals from the cosmos (abbr.)

130. Last statement in a BASIC program

132. Numerical basis for decibels (abbr.)

134. Like a surface mount component

137. The shape of a circularly polarized antenna

139. Tool for removing insulation from a wire

143. CPS

145. Angular speed unit

146. Chemical symbol for ruthenium

147. Chemical symbol for gold

148. Type of logic gate

150. Chemical symbol for mercury

151. 10E1 numerical prefix (pl.)

152. Unit of inductance (abbr.)

153. One port of an amplifier

154. The computer in 2001: A Space Odyssey

156. Short for modulator/demodulator

159. Securing device

161. Network file transfer protocol (abbr.)

162. Chemical symbol for neon

163. The design component of total product cost (abbr.)

165. Describes a region on a semiconductor that has a linear and symmetric I-V curve

167. Country of RF Cafe's residency

169. 36 inches (pl.)

171. Feedback system used to maintain constant signal level (abbr.)

174. High power density battery chemistry (abbr.)

176. 1/000 of an inch

177. RF IC manufacturer located in Dübendorf, Switzerland

179. Direct Memory Access (abbr.)

180. Type of formation for a pushrod end where it connects to a control arm (hyph., pl.)

181. Input intercept point (abbr.)

182. Chemical symbol for molybdenum

183. Unit of capacitance (abbr.)

184. Type of chart

185. One port of an amplifier

186. Numerical basis for decibels (abbr.)

187. Computer monitor cable type (abbr.)

189. Front edge of a wing (abbr.)

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

192. Circuit for maintaining constant voltage (abbr.)

194. Cooling device

196. Part of a FOR loop

197. Charged particle

198. Chemical symbol for gallium

199. Ratio of circumference to diameter

201. 1e3 uV

202. PC follower

204. Unit of length equal to 5.5 yards

206. Possess luminosity

207. He united electricity and magnetism into the concept of the electro-magnetic field (3 wds.)

208. Enter data using the keyboard

1. Spongy material used in anechoic chambers (pl.)

2. Equalizer (abbr.)

3. Test document for verifying proper function (abbr.)

5. Chemical symbol for scandium

6. Rotate about the vertical axis

7. Type of computer display (abbr.)

8. Chemical symbol for helium

9. Original Equipment Manufacturer (abbr.)

10. Output intercept point (abbr.)

11. Chemical symbol for antimony

12. Degree of IC sophistication (abbr.)

13. Time Division Multiplexing

14. Amateur radio abbreviation for the Oceania region (abbr.)

15. Software engineering tool (abbr.)

16. Intermodulation (abbr.)

17. Able to receive or transmit on different bands

19. Time taken for half the atoms of a radioactive sample to decay (hyph.)

24. Its chemical symbol is H

27. Mr. de Forest's first name

29. The "E" in TEM

30. Logarithmic unit of ratio (abbr., pl.)

32. "Texting" (abbr.)

34. A triangle that has all three sides unequal in length

35. One of the Ws in WWW

37. Display type

40. Ham's code for "Entire net stand by."

43. Current-voltage phase mnemonic

45. Chemical symbol for arsenic

46. Chemical symbol for iron

47. System for guiding aircraft (abbr.)

49. Bands between RF and baseband

50. Mathematical basis for calculating noise power for a given bandwidth and temperature (abbr.)

51. Positive voltage lead color

52. Chemical symbol for cadmium

54. Army-Navy specification prefix

56. Filter type that blocks lower frequencies (abbr.)

57. Optical cross-connect (abbr.)

59. Ham abbreviation indicating contacts with all major land masses

60. Chemical symbol for selenium

63. Type of flip-flop

65. Circuit for firing a radar magnetron (abbr., pl.)

67. Ovenized crystal oscillator (abbr.)

69. Computer communication scheme (abbr.)

71. The "D" in RFID (pl.)

72. JavaScript (abbr.)

74. Software routing that adjusts circuit parameters for best performance

75. System On Chip

77. Boolean expression (pl.)

80. Communication between stations by reflecting the radio waves off of the ionosphere

82. Isolated charges

84. Probable location of an element's electron

85. Pertaining to Boolean operations

86. Push to Talk (abbr.)

88. Electromagnetic (abbr.)

89. Unix, Linux or Windows (abbr.)

90. Line of Sight (abbr.)

91. Father of radio

92. Device attached to an antenna mast which rotates it so that the antenna can point in different directions

96. Chemical symbol for argon

98. Chemical symbol for radon

101. Compressed image file format

103. Transformer interwinding connection

104. Popular computer device interface (abbr.)

105. Automatic Calibration System (abbr.)

106. Automated Test Equipment (abbr.)

107. Big Blue

108. Family of ICs with a certain component density level (abbr.)

109. BER, 8 bits at a time

116. Multifunctional silicon devices (abbr., pl.)

117. Army-Navy specification prefix

118. Illumination device

120. European equivalent to the U.L.

121. A common RS-232 serial bus command (abbr.)

124. Frequency division multiple access (abbr.)

125. Digital transmission figure of merit (abbr.)

127. Chemical symbol for selenium

128. Chemical symbol for nickel

130. Unit of energy

131. Switch configuration (abbr.)

133. Metallic outer wrapper used to contain or reject RF signals

135. Maximum distance in orbit around the sun

136. Adding two or more inputs

137. Color quality

138. Type of logic gate

140. Column of rising hot air

141. CB slang for male police officer (2 wds.)

142. Type of bridge circuit

144. Chemical symbol for zinc

147. Type of data conversion device (abbr.)

149. Straight line emanating from a point source

152. Chemical symbol for manganese

155. Local Oscillator (abbr.)

157. Lubricant

158. Multiplexer (abbr.)

159. The UK's largest defense electronics contractor (abbr.)

160. Software drafting tool (abbr.)

161. Start frequency (abbr.)

163. Silicon transistor type (abbr.)

164. Read-only (abbr.)

166. 1/100 meter (abbr.)

168. Half of DSB

170. 10E1 numerical prefix

172. Electronics manufacturer with "meatball" logo

173. Carrier-to-noise ratio (abbr.)

175. Compound used as the frequency determining element in microwave oscillators

177. Online service

178. Maximum Usable Frequency

180. IC socket type for easy insertion & removal (abbr.)

186. The "L" in VLF

187. Type of data storage IC

188. Bits per second (abbr.)

190. Using the moon as a passive reflector to establish a signal path; moonbounce (abbr.)

191. A type of digital modulation (abbr.)

192. Capacitor menufacturer

193. Software engineering tool (abbr.)

195. Logical negation operator

197. Galilean moon

198. Chemical symbol for gallium

200. Multifunctional silicon devices (abbr.)

201. 1/000 of an amp (abbr.)

203. Chemical symbol for thallium

205. Chemical symbol for dysprosium

See solution below


2020 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.

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 27

December 20

December 13

December 7

November 29

Thanksgiving Day

November 22

November 15

November 8

November 1

October 25

October 18

October 11

October 4

September 27

September 20

September 13

September 6

August 30

August 23

August 16

August 9

August 2

July 26

July 19

July 12

July 5

June 28

June 21

June 14

June 7

May 31

May 24

May 17

May 10

May 3

April 26

April 19

April 12

April 5

March 29

March 22

March 15

March 8

March 1

February 23

February 16

February 9

February 2

January 26

January 19

January 12

January 5
















Engineering & Science Crossword Solution February 16, 2020 - RF Cafe

Innovative Power Products Couplers

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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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