Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives Magazine Sponsor RF Cafe Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Alliance Test Equipment Centric RF Empower RF ISOTEC Reactel RF Connector Technology San Francisco Circuits Anritsu Amplifier Solutions Anatech Electronics Axiom Test Equipment Conduct RF Copper Mountain Technologies Exodus Advanced Communications Innovative Power Products KR Filters LadyBug Technologies Rigol TotalTemp Technologies Werbel Microwave Windfreak Technologies Wireless Telecom Group Withwave RF Cafe Software Resources Vintage Magazines RF Cafe Software WhoIs entry for RF Cafe.com Thank you for visiting RF Cafe!
Amplifier Solutions Corporation (ASC) - RF Cafe

Werbel Microwave (power dividers, couplers)

Anatech Electronics RF Microwave Filters - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low-priced products, all of which I created.

RF Cascade Workbook for Excel

RF & Electronics Symbols for Visio

RF & Electronics Symbols for Office

RF & Electronics Stencils for Visio

RF Workbench

T-Shirts, Mugs, Cups, Ball Caps, Mouse Pads

These Are Available for Free

Espresso Engineering Workbook™

Smith Chart™ for Excel

KR Electronics (RF Filters) - RF Cafe

Cross-Number Puzzle
April 1959 Popular Electronics

April 1959 Popular Electronics

April 1959 Popular Electronics Cover - RF CafeTable of Contents

Wax nostalgic about and learn from the history of early electronics. See articles from Popular Electronics, published October 1954 - April 1985. All copyrights are hereby acknowledged.

Here is a rather unique type of crossword puzzle that uses numbers rather than words. It appeared in the April 1959 edition of Popular Electronics magazine. The software that I use to create the RF Cafe crossword puzzles each week has the ability to create such a puzzle, but I have never made one because it would take a lot of time to build a clue / answer file to be drawn upon for input. My custom word-based database has been built up to thousands of technical, science, and engineering terms and clues. Maybe some day I'll do it, though.

Here is another Crossnumber puzzle from the August 1958 issue of Popular Electronics

Crossnumber Puzzle

Cross-Number Puzzle, April 1959 Popular Electronics - RF Cafeby John A. Comstock



1. Year Fleming invented diode vacuum tube.

3. This quantity multiplied by r.m.s. value of a.c. voltage will give peak voltage.

6. Slow record player speed.

8. Difference frequency in kilocycles produced by mixing 1000·kc. signal with 50·kc. signal.

9. Quantity by which peak value of a.c. voltage is multiplied to obtain r.m.s, value.

12. One-half kilowatt expressed in watts.

13. Output frequency in kc. of transmitter having crystal frequency of 2017.5 kc. and two doubler stages.

14. Lower limit of u.h.f. frequency band expressed in megacycles.

15. Large-size hi-fi woofer.

17. Very slow record speed.

18. Year tetrode (screen-grid) vacuum tube was developed. in reverse.

20. Mid frequency in megacycles of TV Channel 6 when lower frequency limit equals 76 mc.

21. Total resistance of two 44-ohm resistors connected in series.

22. Upper frequency limit in mc .. of super-high-frequency band.

24. Voltage drop across 20-ohm resistor when current flow is 10 amperes.

25. Number of feet in 12 yards of hookup wire.

26. Mid frequency of TV Channel 2 when upper channel frequency limit is 60 mc.

27. Actual filament voltage rating of 6-volt vacuum tubes.

28. Popular-size TV screen.

30. Heater voltage of 35Z5 vacuum tube.

31. Separation in megacycles between TV sound and video carrier frequencies.

32. Number of zeros represented by letter K in stating resistor values.

33. Cycles in one megacycle.

34. Total voltage drop in series circuit when applied voltage equals 50 volts.



1. Degrees of phase shift in voltage fed back to produce degeneration in amplifier circuit.

2. TV aspect ratio; ratio of picture width to height.

4. Year Lee de Forest invented triode.

5. Voltage drop across 90-ohm resistor when current flow equals 112 amperes.

7. Tape recorder slow speed in ips.

10. Wavelength in meters of 400-kc. signal.

11. Fast record player speed in rpm (approx.).

14. Electrical degrees in one cycle of alternating signal.

16. In resistor color code, number represented by green, white and yellow.

17. Year pentode was developed.

19. Electrical degrees in one alternation of sinewave signal.

23. Capacitance reactance of 1.0 ufd. capacitor at frequency of 60 cps.

24. Express 0.00271 henrys in microhenries.

27. Convert 650,000 watts to kilowatts.

29. Amount of capacitance in farads that will store 100 coulombs of electricity when applied voltage equals 1.0 volt.

30. This number means "the end."

31. Grade of solder often used in electronics work.

Here are other electronics-themed crossword puzzles from vintage electronics magazines (RF Cafe Crosswords here):

- April 1964 Popular Electronics

- November 1962 Electronics World

- March 1962 Popular Electronics

- September 1958 Radio & TV News

- October 1957 Popular Electronics

- November 1957 Popular Electronics

- January 1974 Popular Electronics

- November 1958 Popular Electronics

- January 1965 Electronics World

- November 1960 Electronics World

- January 1960 Electronics World

- December 1957 Popular Electronics

- February 1966 Popular Electronics

- September 1957 Popular Electronics

- December 1960 Popular Electronics

- August 1958 Popular Electronics

- July 1960 Electronics World

- September 1965 Electronics World

- August 1962 Electronics World

- May 1958 Radio News

- November 1958 Radio News

- April 1963 Electronics World

- July 1961 Electronics World

- July 1963 Electronics World

- May 1967 Electronics World

- August 1960 Popular Electronics

- March 1973 Popular Electronics

- June 1966 Popular Electronics

- April 1959 Popular Electronics

- January 1963 Electronics World

- October 1961 Electronics World

- December 1965 Electronics World

- September 1960 Electronics World

- July 1958 Radio & TV News

- April 1967 QST

- April 1960 Electronics World

- October 1963 Electronics World

- May 1963 Electronics World

- October 1960 Electronics World

- July 1971 Radio-Electronics

- May 1959 Electronics World

- May 1963 Electronics World

- April 1966 Popular Electronics

- May 1961 Electronics World

- August 1958 Radio News

- July 1945 Radio-Craft









Crossnumber Puzzle Solution - RF Cafe



Posted October 1, 2021
(updated from original post on 12/27/2013)

KR Electronics (RF Filters) - RF Cafe
TotalTemp Technologies (Thermal Platforms) - RF Cafe

Anritsu Test Equipment - RF Cafe

Innovative Power Products Passive RF Products - RF Cafe