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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