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About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
Webmaster:
Kirt Blattenberger,
 BSEE - KB3UON

RF 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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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ARRL Lightning Calculators Advertisement in QST
May 1939 QST Article

May 1939 QST

May 1939 QST Cover - RF CafeTable of Contents

These articles are scanned and OCRed from old editions of the ARRL's QST magazine. Here is a list of the QST articles I have already posted. All copyrights are hereby acknowledged.

The ARRL (American Radio Relay League) might be considered as one of the first app developers. At 50¢ and $1 per app, the price was in-line with one of today's typical not-for-free Apple or Android app. A user willing to shell out $4 for all six had at his fingertips calculators and reference tables for capacitive and inductive reactance, resonant frequency, gain and power, conductor amperage, transformer turns ratio, resistor, capacitor, and inductor series and parallel combination, and other values. These six apps were comprised of cardboard, plastic, and a metal eyelet, not data bits.

American Radio Relay League Advertisement

ARRL Lightning Calculators Advertisement, May 1939 QST - RF Cafe

Lightning Calculators

Six Types Solve All Problems

Type A - For problems involving frequency, inductance and capacity, in design of radio frequency circuits. Direct reading answers for size of coils and condensers for any range between 400 kc. and 150 mc. Price, $1, postpaid.

Type B - Gives direct reading answers to calculations involving current, resistance, voltage and power with scale For resistance of copper wire and scale for calculating decibel gain or loss. Price, $1, postpaid.

Type C - More information on electrical conductors than you could find in a book full of tables. Price, 50c, postpaid.

Type D - Gives decibel gain or loss when in­put and output voltages, currents or power are known. Price, 50c, postpaid.

Type E - Direct reading total resistance of resistors connected in parallel, and total capacity of condensers connected in series. Price, 50c, postpaid

Type F - Permits measurement of resistance, from 1 ohm to 1 megohm by use of a voltmeter. Makes an ohm-meter of your voltmeter. Price, 50c, postpaid.

American Radio Relay League, Inc., West Hartford, Conn.

 

 

Posted May 18, 2016