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On December 23, 1947, three engineers working at Bell Laboratories demonstrated the world's first
semiconductor
transistor that produced positive gain. Their names, along with the configuration of their
transistor, are buried in the puzzle along with scores of other science and engineering related
terms. In fact, every word contained herein has been hand selected by me and there is a money back
guarantee if you ever find one not related to mathematics, physics, mechanics, astronomy, chemistry,
and all the other sciences.
Enjoy!
Reproduction of this puzzle without the express permission of RF Cafe is prohibited.
acr. = acronym, abbr. = abbreviation, pl. = plural, wds. = words
1. Electrical connection point
6. Science of assuring operation amid dense EM background noise (abbr.)
9. William ________, along with 39-Across and 99-Across, announced their invention of the transistor
on December 23, 1947
15. Automatic Calibration System (abbr.)
16. Unwanted 60- or 120- Hz modulation
due to poor power supply filtering (2 wds.)
18. Radio term for indicating the end of a transmission
segment
20. Chemical symbol for polonium
21. ___/IP scheme for networked connectivity
23. Akin
to WAC, only just in America
24. 10 decibels
25. Wireless LAN
26. Ratio of circumference to
diameter
28. Having power applied (slang)
30. Airport Surveillance Radar (abbr.)
32. Software
drafting tool (abbr.)
33. Sudden, brief increase in wind speed
34. Current summing point
37.
International Reply Coupon (abbr.)
39. John _______, along with 9-Across and 99-Across, announced
their invention of the transistor on December 23, 1947
43. Unit of length (abbr.)
44. Chemical
symbol for krypton
45. The semiconductor type used by 9-, 39-, and 99-Across for their transistor
48. A type of average (pl.)
50. Filter type that blocks lower frequencies (abbr.)
52. Chemical
symbol for molybdenum
53. Unit of atmospheric pressure (abbr.)
54. Unit of inductance (abbr.)
56. Chemical symbol for cadmium
57. Software drafting tool (abbr.)
59. Opposite of I.D.
62.
1E6 nanoseconds
64. Type of antenna constructed from one or more winding(s) of wire or rods (pl.)
67. First American woman in space (2 wds.)
71. Multifunctional silicon devices (abbr.)
73. Internet
protocol (abbr.)
74. 51 Down + _______, the configuration of the 1947 transistor
76. 1/000 of
an inch
77. Most protruding part of planetary rings as seen from distance
78. RF ____, the world's
best engineering website
79. Cellphone band just below PCS
80. Greek letter
82. Attenuator
84. Modulation type (abbr.)
85. The "D" in RFID (pl.)
87. Digital transmission figure of merit
(abbr.)
90. Last statement in a BASIC program
91. Crystal filter type (abbr.)
92. Filter type
that blocks frequencies in a specified band (abbr.)
93. Used logic gates
95. _____-Carlo analysis
98. Permeability-tuned oscillator (abbr.)
99. Walter _______, along with 9 Across and 39 Across,
announced their invention of the transistor on December 23, 1947
100. Direct Memory Access (abbr.)
101. Its chemical symbol is Sm |
1. Recording onto magnetic media
2. Engineering Change Order (abbr.)
3. Type of flip-flop
4.
Foot/12
5. Chemical symbol for silver
6. Exalted-Carrier Single Sideband (abbr.)
7. Unit of
inductance (abbr.)
8. Mr. Piper's famous yellow airplane
10. 3 MHz to 30 MHz
11. Not hot
12. Large unit of apparent power (abbr.)
13. One component of volume
14. Chemical symbol for erbium
16. A common battery cell size
17. Akin to an EE, CE, AE, etc.
19. Fuel additive
22. The tip
of a PCB probe (pl.)
25. Computer interconnection scheme (abbr.)
26. Form of digital phase modulation
in which the phase of the RF signal depends on the modulating code (abbr.)
27. Optical storage medium
29. Adjust
31. Type of data storage IC
32. World's largest yearly convention of gadget and device
manufacturers (abbr.)
35. Original Equipment Manufacturer (abbr.)
36. Electromagnetic (abbr.)
38. Chemical symbol for copper
40. One component of a complex number (abbr.)
41. Type of data
conversion device (abbr.)
42. Last keyword in a BASIC subroutine (pl.)
46. A common battery cell
size
47. Elementary particle
49. Second largest asteroid
51. _____ + 74 Across, the configuration
of the 1947 transistor
55. Having power applied (slang)
57. Abruptly limit the amplitude of a
signal
58. Chemical symbol for dysprosium
60. Direct Digital Synthesis (abbr.)
61. Rechargeable
battery type (abbr.)
63. International phonetic alphabet letter "S"
64. Line of Sight (abbr.)
65. Last stage in a transmitter (abbr.)
66. Special diode type that can be switched (abbr.)
68.
Modulation type (abbr.)
69. Chemical symbol for radium
70. Electrically Alterable Read Only Memory
72. Person responsible for program spending (abbr.)
74. Imaging device (abbr.)
75. Greek symbol
commonly used to represent angles
79. This calculus operation yields voltage across a capacitor
81. Exponent that returns the original number
83. Digital intelligence
86. Semiconductor device
type (abbr.)
88. Electromagnetic (abbr.)
89. Unit of length equal to 5.5 yards
92. Unit of
heat
93. Type of logic gate
94. Opposite of a LO
96. Home state of Los Alamos lab (abbr.)
97. Chemical symbol for gallium
98. Ratio of circumference to diameter |
See solution below
 Take 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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| Sudoku
December 25
December 18
December 11
December 4
November 27
November 20
November 13
November 6
October 30
October 23
October 2
September 25
September 18
September 4
August 28
August 21
August 14
August 7
July 31
July 24
July 17
July 10
July 3
June 26
June 19
June 12
June 5
May 29
April 10
March 20
March 13
March 6
February 28
February 21
February 7
January 31
January 24
January 17
January 10
January 3
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