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
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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.
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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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