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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,

    BSEE - KB3UON

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 typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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Radio Theme Crossword Puzzle
July 4, 2021

This Radio Theme Crossword Puzzle for July 4th has a few words paying homage to what remains of the freedoms and promises of America, along with 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!


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 4th, 2021 - RF Cafe

ACROSS DOWN
1. PCB material
6. The 1st Amendment of the U.S. Constitution is known as the 10 Down of ______
9. Largest broadcaster in the UK (abbr.)
13. Filter type that blocks upper frequencies (abbr.)
14. Multifunctional silicon devices (abbr.)
15. Chemical symbol for thallium
16. Mate to a TX
17. Einstein's paradoxical traveler
18. Infrared (abbr.)
20. Part of an optical cable bundle
25. x, y, or z on Cartesian coordinates
27. Chemical symbol for silicon
28. Chemical symbol for lawrencium
29. The system than converts common website names to IP addresses (abbr.)
31. Describes the action of cleaving a crystal plane
32. One type of electron spin
34. Number system which uses only the digits 0 to 7
36. 1E6 nanoseconds
39. Galilean moon
40. Chemical symbol for argon
41. Chemical symbol for arsenic
43. A freedom formerly guaranteed by the 1st Amendment of the U.S. Constitution
45. Radio ______ selection
46. Unit of inductance (abbr.)
47. Internet protocol (abbr.)
48. Chemical symbol for einsteinium
53. A freedom formerly guaranteed by the 1st Amendment of the U.S. Constitution (w/ for redress of grievances)
55. Abbreviation for peak voltage
57. The "E" in TEM
58. A common battery cell size
59. The dit-dah-dit sent at the end of a transmission (2 wds.)
60. Chemical symbol for bismuth
62. Filter type that blocks frequencies in a specified band (abbr.)
63. Its chemical symbol is K
67. Network department (abbr.)
69. The 1st Amendment of the U.S. Constitution originally guaranteed five _______s
73. Filter type that blocks frequencies below and above a specified band (abbr.)
74. Reflection where light arriving from a single direction is reflected in a single direction
76. Chemical symbol for tin
77. One component of a complex number (abbr.)
78. Type of component package (abbr.)
79. A digital counter input line to establish an initial value
81. A freedom formerly guaranteed by the 1st Amendment of the U.S. Constitution
85. 1/000 of an amp (abbr.)
86. Network department (abbr.)
87. Unit of inductance (abbr.)
89. Type of current flow (abbr.)
90. Type of chart used to plot immittance
92. The Brits call it a valve
93. A common RS-232 serial bus command (abbr.)
95. End of transmission (abbr.)
97. Chemical symbol for berkelium
98. Chemical symbol for nobelium
99. Longitudinal shape-forming structural element
100. Added an overcurrent protection device
102. Chemical symbol for nickel
103. Swap ____, a Ham's flea market
105. Home state of Los Alamos lab (abbr.)
106. Chemical symbol for europium
107. Test equipment (abbr.)
108. Word used in describing 2-D and 3-D object dimensions; i.e., 10 mm __ 25 mm
110. Modulation technique that varies the width of pulses in a train (abbr.)
111. Memory type of yore
112. Type of screw (2 wds., pl.)
2. Electrical safety organization (abbr.)
3. Filter type (abbr.)
4. Powers pneumatic devices
5. Coefficient of temperature (abbr.)
6. RF computer network
7. Stock symbol for Harris Communications
8. Mate to an RX
9. Bandwidth (abbr.)
10. The 1st Amendment of the U.S. Constitution is known as the ____ of 6 Across
11. Carrier-to-noise ratio (abbr.)
12. Typically 300 Hz to 5 kHz audio frequency
17. Largest moon of Saturn
19. Chemical symbol for radon
21. Multifunctional silicon devices (abbr.)
22. Illumination device
23. Radio signals from the cosmos (abbr.)
24. Semiconductor On Insulator (abbr.)
26. International Amateur Radio Union (abbr.)
27. Chemical symbol for scandium
30. "Texting" (abbr.)
33. Write-Once (abbr.)
34. Typical bandwidth of a directional coupler
35. Chemical symbol for arsenic
37. Chemical symbol for selenium
38. Enter data using the keyboard
40. Soak up RF energy
42. Leading and trailing edge frequency variation of a CW pulse
44. High power density battery chemistry (abbr.)
48. Electronics Industry Association (abbr.)
49. Akin to dynamics, with no movement
50. Color quality
51. Chemical symbol for iron
52. Network department (abbr.)
54. Type of logic gate
56. Chemical symbol for praseodymium
60. Data transmission pathway
61. Type of high frequency diode (abbr.)
63. A freedom formerly guaranteed by the 1st Amendment of the U.S. Constitution
64. Total radiated power (abbr.)
65. Chemical symbol for antimony
66. A freedom formerly guaranteed by the 1st Amendment of the U.S. Constitution
68. Hub of the solar system
69. Release control over
70. BS__ - the degree held by many RF Cafe visitors
71. 10E1 numerical prefix
72. The "M" in TEM
75. Ham radio organization (abbr.)
79. Display a radar target
80. Antenna radiated power measurement (abbr.)
82. Sample groups
83. Chemical symbol for gallium
84. Current-voltage phase mnemonic
85. Unit of length (abbr.)
87. Upper frequency (abbr.)
88. Heterojunction Bipolar Transistor
90. Term for asymmetry of a statistical distribution
91. Part of a FOR loop
92. Technical drawing structure
93. Chemical symbol for copper
94. Chemical symbol for selenium
96. Switch position
97. Graphics file extension
99. Miniature RF connector
100. Finite Element Analysis (abbr.)
101. Sound-pressure level derived using A-weighting
104. Electromagnetic (abbr.)
105. Greek letter used for frequency
107. Chemical symbol for thallium
109. Yard (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.

2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | Sudoku

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Radio Theme Crossword Puzzle for July 4th, 2021 - RF Cafe

Exodus Advanced Communications Best in Class RF Amplifier SSPAs
LadyBug Technologies LB5944A RF Power Sensor - RF Cafe
Exodus Advanced Communications Best in Class RF Amplifier SSPAs
 

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