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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

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 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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Apollo 11's 45th Anniversary Crossword Puzzle
July 20, 2014


We came in peace for all mankind (wikipedia/nasa image)- RF CafeApollo 11 mission patch (NASA image) - RF Cafe"Houston… tranquility base here. The Eagle has landed." Where were you 45 years ago when you heard on radio watched on a B&W TV like I did as Apollo 11's 'Eagle' lunar module touched down on the moon - with less than 30 seconds of fuel remaining? A short while later Neil Armstrong and Buzz Aldrin became humans #1 and #2, respectively, to step onto the lunar surface. "We came in peace for all mankind," was plaque attached to the part of the lunar lander that stayed behind. Poor Michael Collins had to be content with orbiting the moon while is shipmates went to the surface. I created this special crossword puzzle this morning to commemorate the Apollo 11 mission and all the dedicated people who made it happen. BTW, have you seen my Estes Saturn V model?

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


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1. First man on the moon - Neil _________
7. One who attaches components to a PCB
11. Forms into a specific shape
14. Electrical safety organization (abbr.)
15. JavaScript (abbr.)
16. Chemical symbol for nickel
17. Software function selection mechanism
19. Type of current
21. Chemical symbol for berkelium
23. Possess luminosity
24. Variable Frequency Oscillator
27. Modulation type (abbr.)
28. Decimeter (abbr.)
29. Branch of the armed forces
31. BS__ - the degree held by many RF Cafe visitors
33. Chemical symbol for calcium
35. Logic family
37. BlackBerry or Palm for example (abbr.)
38. Sets of 24-hour periods
40. Organization requiring 25 years of amateur service for membership, abbr.
41. Greek letter often used to represent an angle
43. Curly-Q type light bulb (abbr.)
46. PC follower
47. Switch position
48. Chemical symbol for strontium
50. Chemical symbol for gadolinium
51. ___-back transformer
53. A keyboard key
54. Automatic network analyzer (abbr.)
56. Stock symbol for Linear Technologies
57. Electronics manufacturer with "meatball" logo
58. Stock symbol for Boeing
60. Infrared (abbr.)
61. One who DXs
62. Chemical symbol for lanthanum
63. Chemical symbol for calcium
65. Local Oscillator (abbr.)
66. Printer resolution abbreviation
67. Last statement in a BASIC program
68. Type of e-mail address system (abbr.)
69. Chemical symbol for arsenic
70. ______ velocity - speed necessary to become free of the Earth's gravitational force
71. Chemical symbol for tin
73. Application Specific Integrated Circuit (abbr.)
75. Signal amplitude degradation due to inefficiency (pl.)
76. PC follower
78. Morse Code for "from"
79. Manned rocket series that went to the moon
82. Megohm (abbr.)
84. Logarithmic ratio (abbr.)
86. Changes from one thing into another
88. Type of component package (abbr.)
89. Exponent that returns the original number
90. 1/000 of an inch
92. Television Interference (abbr.)
94. Chemical symbol for polonium
95. Start frequency (abbr.)
96. Chemical symbol for zinc
97. RF computer network (abbr.)
98. A common battery cell size
100. Part of this website's title
102. 30 kHz to 300 kHz
104. Digital intelligence
107. Programmable logic device (abbr.)
109. Silicon transistor type
111. Finite Element Analysis (abbr.)
113. Chemical symbol for plutonium
114. Unit of length (abbr.)
116. Chemical symbol for einsteinium
117. Chemical symbol for thallium
119. System for guiding aircraft (abbr.)
121. Printer output resolution unit (abbr.)
123. Cellular Telecommunications Industry Association
125. Under self-control (prefix)
127. Type of computer display (abbr.)
128. Ham's code for "Your net frequency is High."
130. Type of current
131. Chemical symbol for francium
132. A compiler directive
134. Network department (abbr.)
135. Chemical symbol for rhodium
137. End of Life (abbr.)
139. Mr. Blattenberger of RF Cafe
141. Filter type that blocks upper frequencies (abbr.)
143. 1.602E-19 Joules
144. RF ____, the world's best engineering website
146. Akin to an EE, CE, AE, etc.
148. Filter type that blocks lower frequencies (abbr.)
150. Chemical symbol for europium
151. A popular spreadsheet
152. Any mathematical statement that declares the values of two mathematical expressions to be equal
153. SI unit of solid angle
1. Apollo 11 astronaut Buzz ______
2. Unit for 1,000,000 watt-seconds (abbr.)
3. Half of DSB
4. Chemical symbol for radon
5. Lubricant
6. Gigahertz
7. What a capacitor is used for regarding energy
8. Logarithmic unit of voltage (abbr.)
9. 1/6 inch printer's measure
10. Government program to bring electricity to farms (abbr.)
11. Greek letter (micro)
12. International phonetic alphabet letter "L"
13. That which has mass and occupies space (pl.)
18. Home state of Los Alamos lab (abbr.)
20. Centimeter (abbr.)
22. Send Morse Code
25. One possible go-no-go test result
26. Amateur radio abbreviation for the Oceania region (abbr.)
28. Direct Digital Synthesis (abbr.)
30. 36 in. (abbr., pl.)
32. Chemical symbol for einsteinium
33. "Calling any amateur radio station"
34. One type of electron spin
36. Coefficient of temperature (abbr.)
39. Amateur Radio Association (abbr.)
42. Gary Breed's fine magazine on RF & microwaves topics (abbr.)
44. Chemical symbol for iron
45. Lower sideband (abbr.)
46. Army-Navy specification prefix
47. Orthogonal frequency-division multiplexing (abbr.)
49. Ham-ese for Young Lady
52. Chemical symbol for ytterbium
54. Connector vendor headquartered in Bristol, PA
55. Term used in soldering to describe the condition that occurs when the metals being soldered are hot enough to melt the solder so it flows over the surface
56. Geometric entity with only length
57. Key feature in a high level overvoltage protection device
59. Dilbert's female co-worker
60. Internet protocol (abbr.)
63. Apollo 11 astronaut Michael _______
64. Digital encoding of the transmission mode in the vertical sync portion of an SSTV image (abbr.)
66. Digital storage oscilloscope (abbr.)
67. Type of reconfigurable memory (abbr.)
69. Alternative name for Beta Persei
72. Stock symbol for National Semiconductor
73. Stock symbol for Advanced Micro Devices
74. Opposite of O.D.
76. Amateur Teleprinter Over Radio (abbr.)
77. Part of a FOR loop
79. __________ Test - used to verify compliance with manufacturer published specifications
80. Number system which uses only the digits 0 to 7
81. Family of ICs with a certain component density level (abbr.)
83. Communication between stations by reflecting the radio waves off of the ionosphere
85. Operational range of frequencies (pl.)
86. Type of capacitor dielectric
87. Sample-and-____
89. Switch position
91. Low- to mid- frequency connectors
93. Unit of apparent power (abbr.)
99. Ham's code for "Answer in prearranged order."
101. Small unit of capacitance (abbr.)
102. Once around a circuit
103. Method used to sell off wireless spectrum to corporations
105. Chemical symbol for terbium
106. Nordic Mobile Telephone
108. Chemical symbol for aluminum
110. Chemical symbol for platinum
112. International phonetic alphabet letter "E"
115. Minutes of Use (abbr.)
116. Apollo ______ - first men on the moon
118. Ham's code for "Shall I stop sending?"
120. "Calling any amateur radio station"
122. Multifunctional silicon devices (abbr.)
124. Type of current flow (abbr.)
125. Sound frequency in the human hearing range (abbr.)
126. Internet address (abbr.)
127. Complex Instruction Set Computer
129. Chemical symbol for neon
133. Chemical symbol for selenium
135. Chemical symbol for radium
136. Gary Breed's fine magazine on RF & microwaves topics (abbr.)
138. Stock symbol for Lockheed Martin
140. Using the moon as a passive reflector to establish a signal path; moonbounce (abbr.)
142. It can follow an MS
144. Chemical symbol for chlorine
145. Equalizer (abbr.)
147. Chemical symbol for erbium
149. Ratio of circumference to diameter

See solution below


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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