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What's Your EQ?
December 1962 Radio-Electronics

December 1962 Radio-Electronics

December 1962 Radio-Electronics Cover - RF Cafe Website[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Electronics, published 1930-1988. All copyrights hereby acknowledged.

Continuing its long-time monthly "What's Your EQ?" feature where readers submit electronics-related challenges, Radio-Electronics magazine published these three in the December 1962 issue. I have to admit to not getting the "120-240 Switchover" problem due to thinking only "inside the box." I didn't consider that adding another component to the circuit was permissible. I thought only the presented wires and component were available for use. Don't you make the same mistake. "Voltage Quandary" was not as difficult, but took some head scratching. The "What Am I?" picture escaped my identification. I could see what the part in the center was, but not what it was mounted to. After seeing the entire item, I have to say I don't recalling seeing that part mounted on that item. At first I though it might be a close-up of R2D2's head, but that dude as a decade and a half away from birth by Mr. Lucas.

What's Your EQ?

"What's Your EQ?, December 1962 Radio-Electronics - RF Cafe WebsiteThree puzzlers for the student, theoretician and practical man. They may look simple, but double-check your answers before you say you've solved them. If you've got an interesting or unusual answer send it to us. We are especially interested in service stinkers or engineering stumpers on actual electronic equipment. We are getting so many letters we can't answer individual ones, but we'll print the more interesting solutions (the ones the original authors never thought of). We will pay $10 and up for each one accepted. Write EQ Editor, Radio-Electronics, 154 West 14th St., 120-240 Switchover - RF Cafe WebsiteNew York, N. Y.

Answers for this month's puzzlers are on page 63.

120-240 Switchover

A 120/240-volt dc generator supplies the power for a balanced 3-wire 120-volt load as shown. A 120-volt generator is to be installed for emergency use. What must be done, using a knife-switch arrangement, to switch the entire load from the 3-wire generator to the 2-wire generator without reversing the polarity, and making certain that one generator cannot inadvertently be connected to the other or that 240 volts cannot be inadvertently connected to a 120-volt load?

- Z. L. Langly

 

Voltage Quandary - RF Cafe WebsiteVoltage Quandary

Without writing any equations (by inspection), what is the B-plus voltage?

- Rudolf H. Schorsch

 

What Am I? - RF Cafe WebsiteWhat Am I?

This is a photographic one. Do you recognize it?

- Larry Steckler

Quizzes from vintage electronics magazines (and many custom RF Cafe-generated quizzes) such as Popular Electronics, Electronics-World, QST, Radio-Electronics, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes

Answers to What's Your Eq?

These are answers! The puzzles on page 49.

120-140 Switchover Solution - RF Cafe Website120-140 Switchover Solution

Split the neutral and install a 4-pole double-throw switch as shown. This problem actually arose, and an arrangement similar to the one shown here was used in the construction of a distribution panel for a large dredge.

 

Voltage Quandary Solution

Since this is a series circuit, there is only one current path. Therefore, the voltage drop across R3 plus R4 must equal the voltage drop across R2 plus R3, because R2 equals R4 and R3 is common to both combinations. So, with a 40-volt drop across R1 plus R2 and a 30-volt drop across R3 plus R4, we get a total of 70 volts.

 

What Am I? Solution - RF Cafe WebsiteWhat Am I? Solution

A coax speaker, of course!

Temwell RF Microwave Components - RF Cafe

About the RF Cafe™ Website ©1996-2026

Kirt Blattenberger - RF Cafe WebmasterRF 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 tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived...

Webmaster: Kirt Blattenberger  |     BSEE - KB3UON - AMA92498  |  USAF Radar Technician

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