For two decades, I have been creating custom engineering- and science-themed crossword puzzles for the brain-exercising benefit and pleasure of RF Cafe visitors who are fellow cruciverbalists. This October 13, 2019, puzzle contains the names of at least eight advertisers* who help deliver RF Cafe to you every day. Otherwise, it uses a database of thousands of words which I have built up over the years and contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, etc. You will never find a word taxing your knowledge of a numbnut soap opera star or the name of some obscure village in the Andes mountains. You might, however, encounter the name of a movie star like Hedy Lamarr or a geographical location like Tunguska, Russia, for reasons which, if you don't already know, might surprise you. The jury is out on whether or not this type of mental challenge helps keep your gray matter from atrophying in old age, but it certainly helps maintain your vocabulary and cognitive skills at all ages. * Click here for a list of RF Cafe advertisers. cruciverbalist: [noun] cruci- ("cross") + verbal ("words") + -ist ("agent, person") -- A person who constructs or works crosswords.
Reproduction of this puzzle without the express permission of RF Cafe is prohibited.
acr. = acronym, abbr. = abbreviation, pl. = plural, wds. = words 
<click for full size to print> 1. Ham's code for "Does my frequency vary?"
4. _____Temp Technologies, maker of thermal platforms for cryogenic cooling, , recirculating circulating coolers, temperature chambers and temperature controllers*
8. Opposite of set
12. Amateur Radio Association (abbr.)
15. Silicon transistor type (abbr.)
17. Unit of length equal to 5.5 yards
18. End of Life (abbr.)
19. Below ELF
21. Type of matrix barcode used with laser scanning(abbr.)
23. Ham's code for "What is the name of your station?"
25. Substrate for mounting components (abbr.)
27. Sample group
28. Device under test (abbr.)
29. Chemical symbol for aluminum
30. 300 MHz to 3 GHz
32. Electromagnetic interference (abbr.)
34. Chemical symbol for selenium
35. Network department (abbr.)
36. Big Blue
37. U.K. equivalent of the IEEE
38. Greek letter
39. BlackBerry or Palm for example (abbr.)
41. Common average used for sinewaves (abbr.)
42. Flash caused by an electric current ionizing a gas or vapor
43. Custom ____, produces RF switches, phase shifters, attenuators, mixers and multipliers, and low noise, low phase* noise, and distributed amplifiers
45. Slang for transmitter and/or receiver
46. Ham abbreviation for transceiver
48. ________ Test Equipment, used / refurbished TE with short- and long-term rentals, repair, maintenance, calibration
49. Component that only allows RF signal flow in one direction
50. Type of data conversion device (abbr.)
52. Video Graphics Array (abbr.)
53. International phonetic alphabet letter "E"
56. World's first satellite navigation system (abbr.)
58. A common RS-232 serial bus command (abbr.)
59. Filter type that blocks upper frequencies (abbr.)
62. Balun with both ports unbalanced
65. Angular speed unit
66. Once around a circuit
67. Unit of apparent power (abbr.)
68. Analog-to-Digital (abbr.)
70. The "B" in BER
72. Voltage-current phase mnemonic
73. Chemical symbol for arsenic
74. Communication between stations by reflecting the radio waves off of the ionosphere
75. Spurious RF products created by metal joints (abbr.)
76. Stock symbol for Texas Instruments
78. Radio Amateurs of Canada (abbr.)
80. Chemical symbol for scandium
81. Facsimile
82. U.S. military organization (abbr.)
83. Effective Radiated Power (abbr.)
85. Precision approach radar (abbr.)
87. Internet address (abbr.)
88. Steel, brass, aluminum, etc.
89. _____, maker of RF power amplifiers, LNAs, integrated assemblies, microwave and mm-wave systems*
90. Design for Manufacturability (abbr.) | 2. Chemical symbol for radon
3. Stock symbol for Hewlett Packard
5. Type of logic gate
6. Uppermost surface
7. Type of data conversion device (abbr., pl.)
9. Low altitude earth orbit
10. End of transmission (abbr.)
11. Chemical symbol for aluminum
12. ___-AZIMUTH telescope mount
13. Centric __, maker of coaxial components, including attenuators, adapters, cable assemblies, terminations, power dividers*
14. A triangle that has all sides equal in length
16. The design component of total product cost (abbr.)
19. Add two or more inputs
20. Anatech ___________, produces RF and microwave filters, diplexers, duplexers*
22. Greek letter
24. Unit of current
26. Connector vendor, now owned by FCI in St. Louis, Missouri
27. Parts _____
28. Relative power level unit (abbr.)
29. Anatech Electronics Inc., (abbr.)
31. Unit of length (abbr.)
33. Opposite of O.D.
36. Infrared (abbr.)
37. Intermodulation (abbr.)
40. Length times width (pl.)
42. Leaded component type
44. A common battery cell size
47. Programmable Logic Device (abbr.)
51. Study for a test just before taking it
52. Very small aperture terminal
54. Hz
55. 1/100 meter (abbr.)
56. Key feature in a high level overvoltage protection device
57. Min-to-max voltage of a waveform (abbr.)
60. Chemical symbol for lead
61. Type of digital filter (abbr.)
63. Chemical symbol for neon
64. FCC's Universal Licensing System (abbr.)
66. Shorthand for liquid oxygen
67. ____RF, manufacturer of isolators, circulators, power dividers, couplers, connectors, adapters, cable assemblies*
69. One who DXs
71. Transformer interwinding connection
74. The computer in 2001: A Space Odyssey
75. Short for potentiometer
77. Non-return to zero (abbr.)
79. Software drafting tool (abbr.)
81. Chemical symbol for francium
82. Morse Code for "from"
84. Ratio of circumference to diameter
86. Empower __ Systems, producer of fault-protected high-power solid state amplifiers* |
See solution below
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