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Radio Theme Crossword Puzzle
July 25, 2021

This Radio Theme Crossword Puzzle for July 25th 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 --- This one is going to take a while!

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

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

Radio Theme Crossword Puzzle for July 25th, 2021 - RF Cafe

1. _________ Listening was a popular sport in the early days of radio

8. Polynomial of second order

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

17. 10E1 numerical prefix

20. Communication type that method makes use of electromagnetic waves, and is this Crossword Puzzle's main theme

21. Chemical symbol for erbium

23. Maintains a voltage for sampling

24. Test point (abbr.)

25. Custom metal parts (shields, etc.) etching company located in Chicago, IL

28. Constellation : The lion

29. Front edge of a wing (abbr.)

31. Type of modulation (abbr.)

33. Common average used for sinewaves (abbr.)

34. Infrared (abbr.)

35. CB slang for police speed radar

37. Boob tube (abbr.)

38. An unlicensed radio band in the U.S. often used for walkie-talkies (abbr.)

39. Governmental agency that monitors pollution (abbr.)

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

42. Finite Element Analysis (abbr.)

44. Stock symbol for Raytheon

46. Mathematical process that yields a quotient as its result

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

50. Circuit or mechanical designer with a Bachelor's or higher degree

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

55. Maximum Usable Frequency

56. ___-AZIMUTH telescope mount

57. Chemical symbol for magnesium

59. Describes the action of cleaving a crystal plane

60. Release control over

61. Under sampled

62. Crystal filter type (abbr.)

65. Chart types

67. Miniature RF connector

69. Transformer interwinding connection

71. Decimeter (abbr.)

72. Adding of information to a CW signal

75. PC follower

76. Release volatile products from a liquid coating such as paint

77. Upper frequency (abbr.)

78. Institute of Electrical and Electronics Engineers

79. Filter type that blocks frequencies below and above a specified band (abbr.)

80. Substrate for mounting components (abbr.)

81. Chemical symbol for tantalum

83. Angular speed unit

85. Semiconductor lamp

86. Type of chart

87. Type of logic gate

88. Describes when a synchronous motor loses phase lock (pl.)

91. Amp/1000

94. Type of microwave diode

96. Silicon transistor type (abbr.)

99. Chemical symbol for radon

100. Common shorthand reference for a capacitor

101. Opposite of I.D.

102. Chemical symbol for scandium

103. Mathematics of angles

105. BER, 8 bits at a time

106. Local Oscillator (abbr.)

108. Ham's code for "Answer in prearranged order."

109. Unit of inductance (abbr.)

111. Reflected radar or sonar signal (pl.)

113. Service of the ARRL that helps hams solve technical problems (abbr.)

115. Home state of Los Alamos lab (abbr.)

116. Key feature in a high level overvoltage protection device

118. Chemical symbol for einsteinium

119. Chemical symbol for selenium

121. Test equipment (abbr.)

122. Add two or more inputs

123. 3-phase transformer configuration

125. A common IC bond wire metal

127. Large unit of apparent power (abbr.)

129. Multiplexer (abbr.)

131. Application Specific Integrated Circuit (abbr.)

133. Programmable Logic Device (abbr.)

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

136. Morse Code for "from"

137. Chemical symbol for palladium

138. Intel x86 command for " jump if above"

139. Electrical overstress (abbr.)

140. Chemical symbol for tin

141. Measure of source / load mismatch (abbr.)

142. Length times width (pl.)

147. Chemical symbol for antimony

149. BER, 8 bits at a time

150. Abbreviation for minimum voltage

152. "Texting" (abbr.)

153. Dilbert's dog

155. Unit of length (abbr.)

157. Army-Navy specification prefix

158. Peripheral Component Interface (abbr.)

161. Chemical symbol for strontium

163. Software drafting tool (abbr.)

165. 10E-12 numerical prefix

167. Wireless communications used by truckers (abbr. + word, pl.)

170. Strong, lightweight wood

174. Unit of length (abbr.)

175. Filter type that blocks upper frequencies (abbr.)

176. Circuit element connecting PCB layers

179. Resistive component of a capacitor's lumped element model (abbr.)

180. Unit of inductance (abbr.)

181. Miniature threaded RF connector

184. 10E1 numerical prefix

185. Automatic Testing, Evaluation & Reporting (abbr.)

186. Network department (abbr.)

187. One who glues together

188. Chemical symbol for terbium

189. Kept in working condition

193. A common battery cell size

195. Automatic Calibration System (abbr.)

196. World's first satellite navigation system (abbr.)

197. Antenna radiated power measurement (abbr.)

198. Voltage-controlled oscillator (abbr.)

199. Cabinet manufacturer in Cheektowaga, NY

202. Ultra Fine Pitch Technology (abbr.)

206. Optical cross-connect (abbr.)

207. Type of component package (abbr.)

209. Imaging device (abbr.)

211. Very large unit of apparent power (abbr.)

212. Chemical symbol for silicon

213. Battery manufacturer in Bethel, CT

215. Network department (abbr.)

216. Area outside the stopband

218. Anatech Electronics Inc., (abbr.)

219. Rate of a radar transmitter's output waveform (abbr.)

220. Return-to-Zero (abbr.)

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

222. Automatic Calibration System (abbr.)

224. U.S. radio band from 530 to 1,700 kHz (abbr.)

225. Created an impenetrable physical barrier

227. Chemical symbol for polonium

228. Voltage-current phase mnemonic

230. Chemical symbol for iron

231. Chemical symbol for ytterbium

232. Software engineering tool (abbr.)

234. Ham radio operator

236. 1e-6 mA

238. Connector vendor

240. Chemical symbol for mendelevium

241. Have a chemically induced effect

244. National Television System Committee (abbr.)

246. Unit of length (abbr.)

247. The "C" in CES, the world's largest yearly convention of gadget and device manufacturers

248. Voltage regulator type for stepping up or down (hyph.)

2. Time taken for half the atoms of a radioactive sample to decay (2 wds.)

3. Type of digital transmission and a method of encoding digital data on multiple carrier frequencies (abbr.)

4. Time delay (abbr.)

5. 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

6. Adjacent Channel Power Ratio (abbr.)

7. Unit of apparent power (abbr.)

9. Infrared (abbr.)

10. Forerunner to NASA

11. Opposite of I.D.

12. Created an efficient microstrip corner shape

13. Satellite of Jupiter discovered by Galileo

14. Mr. de Forest's first name

15. Chemical symbol for rhodium

18. Read-only (abbr.)

19. State of matter, descriptive

22. Read-only (abbr.)

25. Filter start frequency (abbr.)

26. End of soldering iron

27. Type of logic gate

28. C++, Java, BASIC, or Fortran, for example

29. Chemical symbol for lawrencium

30. IC killer (abbr.)

32. Manned rocket series that went to the moon

36. Stock symbol for Raytheon

37. Quantity of heat equal to 100,000 BTU

38. Receiver type for commercial broadcasts (abbr. + word, pl.)

39. Electronics Industry Association (abbr.)

40. Antenna (abbr.)

41. Amateur radio enthusiast

43. Logic family

45. Quantity is measured in hertz

47. A false signal produced in a superheterodyne receiver’s circuitry (pl.)

48. Volume unit (abbr., pl.)

51. A measure of receiver quality (abbr.)

52. BS__ - the degree held by many RF Cafe visitors

54. Traditional term for a person who enjoys helping newcomers get started in ham radio - a mentor

58. Started as HPIB

59. 10E-2 numerical prefix

62. Force a signal to an insignificant level

63. Chemical symbol for aluminum

64. Wireless application protocol (abbr.)

66. Galilean moon

67. Remove insulation from a wire

68. Voltage present at both opamp input terminals (2 wds.)

69. Logic family (abbr.)

70. Attenuator

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

73. Antenna gain unit (abbr.)

74. Coefficient of temperature (abbr.)

77. Heatsink feature (pl.)

82. Circuit for maintaining constant voltage (abbr.)

84. Last stage in a transmitter (abbr.)

86. Chemical symbol for plutonium

89. Filter type that blocks upper frequencies (abbr.)

90. Signal-to-noise ratio (abbr.)

91. 1/000 of an inch

92. Chemical symbol for lanthanum

93. BlackBerry or Palm for example (abbr.)

94. Global System for Mobile Communications (abbr.)

95. The fourth state of matter, which occurs in stars and fusion reactors (pl.)

96. On-the-air meeting of hams at a set time, day and radio frequency

97. Chemical symbol for lead

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

104. Advanced Communication Technologies and Services (abbr.)

105. Write-Once (abbr.)

107. Exponent that returns the original number

108. Ham's code for "Take over as net control station."

110. First lines in software that call external libraries (pl.)

112. He gave his name to the uncertainty principle

113. Chemical symbol for thulium

114. Shortwave listener (abbr.)

116. Chemical symbol for gadolinium

117. Max or min voltage of a waveform (abbr.)

120. Chemical symbol for europium

124. 36 in. (abbr., pl.)

126. Have a positive phase wrt a reference

128. Abbreviation for peak voltage

130. Chemical symbol for xenon

131. Chemical symbol for arsenic

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

133. Peak Inverse Voltage

134. Type of matrix barcode used with laser scanning(abbr.)

135. Name for amateur wireless communications (2 wds.)

143. Type of flip-flop

144. System On Chip

145. Decibels above or below a dipole antenna (abbr.)

146. Quantity of voltage, and the "A" in AM

148. Beat frequency oscillator (abbr.)

149. Ham abbreviation indicating contacts with all major land masses

151. Akin to EEs, CEs, AEs, etc. (abbr., pl.)

152. Half of DSB

154. Chemical symbol for gallium

156. Unit of processor calculation speed, abbr.

158. Components

159. Chemical symbol for cadmium

160. Input intercept point (abbr.)

162. Unit of time (abbr.)

164. Receiver type for commercial broadcasts (abbr. + word, pl.)

166. Chemical symbol for californium

168. Type of flip-flop

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

171. Computer communication scheme (abbr.)

172. Stock symbol for Advanced Micro Devices

173. Filter type commonly used in phase-locked-loops

174. A type of average (pl.)

176. Voice of America

177. Grow in amplitude

178. Agilent's EE design software (abbr.)

181. Halves of DIP's

182. Chemical symbol for manganese

183. Amateur radio operating mode for sharing real-time video (abbr.)

190. Chemical symbol for argon

191. Type of current flow (abbr.)

192. ______ velocity - speed necessary to become free of the Earth's gravitational force

194. Type of reconfigurable memory (abbr.)

197. The "E" in ELF

200. Surrounding environmental conditions

201. Very large unit of apparent power (abbr.)

203. Upper frequency (abbr.)

204. Chemical symbol for tantalum

205. Under samples

206. Output intercept point (abbr.)

208. 1E6 cycle per second

209. Printer output resolution unit (abbr.)

210. Digital Signal Processor (abbr.)

214. Mr. de Forest's first name

217. 24 hours

220. Term indicating profitability of a company (abbr.)

223. Unlicensed radio type used by truckers (abbr.)

226. ECM response

227. Chemical symbol for platinum

228. Chemical symbol for erbium

229. Stock symbol for Intel

230. First-in, first-out, abbr.

232. Centimeter (abbr.)

233. Type of data conversion device (abbr.)

235. One type of electron spin

237. A type of digital modulation (abbr.)

239. 3 MHz to 30 MHz

241. Chemical symbol for radon

242. Chemical symbol for gold

243. Test equipment (abbr.)

244. Greek letter used for frequency

245. Unlicensed FCC Part 95 realm for personal and business radio use (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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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

December 12

December 5

November 28

November 21

November 14

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October 31

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October 10

October 3

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February 21

February 14

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Radio Theme Crossword Solution for July 25th, 2021 - RF Cafe

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Anatech Electronics RF Microwave Filters - RF Cafe

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