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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 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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Microwave Engineering Theme Crossword Puzzle
July 18th, 2021

This Wireless Engineering Theme Crossword Puzzle for July 18th contains only words and clues related to engineering, mathematics, chemistry, physics, and other technical words. 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., Hedy Lamarr or the Bikini Atoll). 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

Wireless Engineering Theme Crossword Puzzle for July 18th, 2021 - RF Cafe

1. Software language by Borland (now Embarcadero)
5. Did not pass electrical test
10. Device used to contact areas on bare semiconductor circuits (2 wds.)
19. Chemical symbol for radium
20. Small unit of capacitance (abbr.)
22. Transformer interwinding connections
23. 6.02x10E23 of anything
24. Color code for the number 6 (pl.)
26. PC follower
28. Basic oscillator configuration that incorporates a crystal
32. Part of this website's title
33. Morse Code for "from"
34. Unit of frequency (archaic, abbr.)
36. Logarithmic unit of power
37. Filter type that blocks frequencies in a specified band (abbr.)
38. Software engineering tool (abbr.)
40. Chemical symbol for neptunium
41. Intel 8086 or Motorola 6800 (abbr.)
43. Circumference/pi
47. Constellation : The lion
48. Chemical symbol for calcium
50. International phonetic alphabet letter "A"
53. A method of sending Morse code characters
55. CB slang for CB radio or antenna
56. High Data Rate
57. Dimension from wing LE to TE
59. European equivalent to the U.L.
60. Product of power and time
62. Amateur radio abbreviation for the Oceania region (abbr.)
63. Frequency Division Duplex
64. Half of a DIP
66. Precipitates
71. A common battery cell size
72. Unit of frequency (archaic, abbr.)
73. Metric system (abbr.)
75. Volume unit (abbr., pl.)
76. Opposition to the flow of an electrical current
78. Time Division Multiplexing
79. Ham's code for "Shall I increase power?"
80. Chemical symbol for lanthanum
81. Precision landing system (abbr.)
82. Mate to a pin
83. Powers pneumatic devices
84. Amateur radio operator who is qualified to administer Amateur Radio licensing examinations (abbr., pl.)
85. Chemical symbol for europium
86. Impurity in a semiconductor
88. Chemical symbol for radon
90. Image file format name extension, (pl.)
92. Circuit element connecting PCB layers
93. Society of Civil and Structural Engineers (abbr.)
95. _____ _____ - popular author on engineering situations (first & last name)
100. Image
102. Chemical symbol for argon
103. Logic family (abbr.)
105. Boring implement (2 wds.)
106. A common RS-232 serial bus command (abbr.)
107. Chemical symbol for iron
109. Television Interference (abbr.)
111. Chemical symbol for einsteinium
112. Software layer that allows a system to be programmed via a defined set of commands (abbr.)
114. Radio signals from the cosmos (abbr.)
115. Army-Navy specification prefix
116. Sound frequency in the human hearing range (abbr.)
117. Metal or plastic rod that connects a potentiometer wiper to a knob (pl.)
121. Chemical symbol for manganese
122. Use a squeezing tool for attaching a wire lug
124. Automatic Packet Position Reporting System (abbr.)
127. Frequency division multiple access (abbr.)
129. 1.602E-19 Joules
130. Centimeter (abbr.)
132. Short-lived voltage or current excursion (pl.)
133. Power meter circuit configuration
134. Plus or minus, for example
2. Chemical symbol for erbium
3. Polish a crystal to an exact frequency
4. Discipline for aircraft navigation in low visibility environments (abbr.)
6. PC follower
7. International Amateur Radio Union (abbr.)
8. Filter type that blocks upper frequencies (abbr.)
9. Chemical symbol for einsteinium
10. Write-Once (abbr.)
11. Chemical symbol for aluminum
12. 10E-15 numerical prefix
13. Chemical symbol for rubidium
14. Programmable Logic Device (abbr.)
15. Rare earth laser material
16. Original Equipment Manufacturer (abbr.)
17. Filter type that blocks frequencies in a specified band (abbr.)
18. A Network of automated packet radio stations for disseminating DX and contest reports (2 wds.)
21. A BPF specification (abbr.)
23. A type of average
25. Inadvertent impression of a signal onto an adjacent conductor (2 wds.)
27. Chemical symbol for tantalum
29. One port of an amplifier
30. Governmental agency that monitors pollution (abbr.)
31. International phonetic alphabet letter "E"
33. The "D" in DC
35. The largest asteroid
37. Digital transmission figure of merit (abbr.)
39. Reflected radar or sonar signal (pl.)
42. Astronomical distance of 3.26 light years
43. Type of data conversion device (abbr.)
44. 1E6 nanoseconds
45. Modern battlefield technique (abbr.)
46. Stock symbol for Raytheon
47. Direction of carbon fiber strands
49. Type of data conversion device (abbr.)
51. Smartphone display (abbr., pl.)
52. It can follow an MS
54. Part of a screw that engages the driver (pl.)
55. Enhanced Graphics Adapter
58. Plane circular area
61. Type of data storage IC
63. An overcurrent protection device (pl.)
65. Type of chart
67. A common battery cell size
68. Volt, meter, pint, pound, eg.
69. Code used for automating software task
70. BS__ - the degree held by many RF Cafe visitors
72. Chemical symbol for krypton
74. Chemical symbol for gallium
75. 3 kHz to 30 kHz
76. Read-only (abbr.)
77. Alter the relations between the parts of a structure or shape by applying an external force
78. The "T" in ATE
79. Unit of liquid volume
81. U.K. equivalent of the IEEE
82. Retain a charge
84. Variable Frequency Oscillator
85. Electronics Industry Association (abbr.)
86. Type of high speed Internet service (abbr.)
87. Imaging device (abbr.)
89. Nordic Mobile Telephone
91. Type of spread spectrum that does not use direct sequence spreading (abbr.)
94. A common RS-232 serial bus command (abbr.)
96. Largest moon of Saturn
97. Chemical symbol for thallium
98. Chemical symbol for aluminum
99. Sound-pressure level derived using A-weighting (pl)
101. Switch position
104. Quantum electron property
106. Stock symbol for RF Micro Devices (now Qorvo)
108. Radio signals from the cosmos (abbr.)
110. Abbreviation for minimum voltage
112. Amateur Radio Association (abbr.)
113. International Microwave Symposium (abbr.)
116. Ticker symbol for Analog Devices
118. Chemical symbol for helium
119. A feedback scheme to level out the receiver audio volume (abbr.)
120. Special diode type that can be switched (abbr.)
122. Chemical symbol for chromium
123. Ratio of circumference to diameter
125. Chemical symbol for platinum
126. Type of flip-flop
127. Chemical symbol for francium
128. Chemical symbol for silver
131. Chemical symbol for magnesium

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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December 26

December 19

December 12

December 5

November 28

November 21

November 14

November 7

October 31

October 24

October 17

October 10

October 3

September 26

September 19

September 12

September 5

August 29

August 22

August 15

August 8

August 1

July 25

July 18

July 11

July 4

June 27

June 20

June 13

June 6

May 30

May 23

May 16

May 9

May 2

April 25

April 18

April 11

April 4

March 28

March 21

March 14

March 7

February 28

February 21

February 14

February 7

January 31

January 24

January 17

January 10

January 3
















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