These custom-made engineering and science-themed crossword puzzles are done weekly for the brain-exercising benefit and pleasure of RF Cafe visitors who are fellow cruciverbalists. 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. A database of thousands of words has been 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. 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. Equation 5. 2 Down + _______ + 13 Down + 15 Down spreadsheet, which performs 10 Down* 9. Greek letter 11. Switch position 12. Conductor size unit (abbr.) 14. Relative power level unit (abbr.) 17. Unit of inductance (abbr.) 18. Beat frequency oscillator (abbr.) 19. Hydrogen, argon, neon, xenon, etc. 20. Ovenized crystal oscillator (abbr.) 22. System for underwater navigation (pl.) 25. Masses 27. Chemical symbol for scandium 28. Unit of frequency (archaic, abbr.) 29. Key feature in a high level overvoltage protection device 30. Chemical symbol for berkelium 31. Chemical symbol for thallium 32. Unit of frequency (archaic, abbr.) 34. Chemical symbol for ruthenium 36. Multifunctional silicon devices (abbr.) 38. Radio signals from the cosmos (abbr.) 40. Chemical symbol for silicon 41. European equivalent to the U.L. 42. Software object reference name 43. Software engineering tool (abbr.) 44. Type of chart use for project planning 45. Electrical safety organization (abbr.) 48. Chemical symbol for radon 50. Unit of apparent power (abbr.) 51. Type of flip-flop 52. Chemical symbol for chlorine 54. Unix, Linux or Windows (abbr.) 55. Semiconductor and calculator company (abbr.) 57. Unit of length (abbr.) 58. 30 Hz to 300 Hz 59. Opposite of I.D. 61. Opposite of O.D. 62. Satellite EHF Communications for Mobile Multimedia 64. Large loudspeaker designed primarily to reproduce low frequency audio signals 67. Electronics Industry Association (abbr.) 68. Plane circular area (pl.) 69. Maximum Usable Frequency 70. Internet protocol (abbr.) 71. Cellphone band directly above DCS 73. Semiconductor device type (abbr.) 74. Unit of length (abbr.) 76. Designation for a DoD-defined component or system (hyp.) 80. Grouping of wires or cables 81. Code used for automating software tasks | 1. What current is said to do (pl.) 2. __ + 5 Across + 13 Down + 15 Down spreadsheet, which performs 10 Down* 3. Numerical basis for decibels (abbr.) 4. Modulation type (abbr.) 5. Chemical symbol for cobalt 6. Type of logic gate 7. A common battery cell size 8. Reflected radar or sonar signal (pl.) 10. Mathematical calculation of RF component string (2 wds.) 12. Colorado Springs military school (abbr.) 13. 2 Down + 5 Across + ____ + 15 Down spreadsheet, which performs 10 Down* 15. 2 Down + 5 Across + 13 Down + ____ spreadsheet, which performs 10 Down* 16. Imaging device (abbr.) 18. Low- to mid- frequency RF connector 21. Transmit Incremental Tuning (abbr.) 23. Generate a periodic signal 24. Special diode type that can be switched (abbr.) 25. Largest broadcaster in the UK (abbr.) 26. Electrical terminal, normally left unconnected at one end 32. 1E6 nanoseconds 33. Constellation : The scales 35. Unit of time (abbr.) 36. Band between RF and BB 37. Opposite of a source (pl.) 39. Test equipment (abbr.) 45. PCB mask exposing ray (abbr.) 46. JavaScript (abbr.) 47. Amateur radio abbreviation for the Oceania region (abbr.) 49. Unit of time (abbr.) 51. Common average used for sinewaves (abbr.) 53. The "L" in VLF 56. Current-voltage phase mnemonic 57. Million multiply accumulate operations (abbr.) 60. Weatherproof cover for a radar antenna 61. Type of secondary radar system (abbr.) 62. Type of chart used to plot immittance 63. Output intercept point (abbr.) 65. One port of an amplifier 66. Increases voltage linearly 72. "Texting" (abbr.) 73. U.S. Spectrum allocation agency 75. Chemical symbol for strontium 77. Network department (abbr.) 78. Chemical symbol for einsteinium 79. One type of electron spin |
See solution below

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