1996 - 2016
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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June 1935 Radio-Craft[Table of Contents]
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Radio-Craft was published from 1929 through 1953. All copyrights are hereby acknowledged. See all articles from Radio-Craft.
American-Bosch 524A: In this receiver a unique mechanical design has been utilized to secure an attractive appearance, mechanical stability and desirable service features. The circuit has been designed and adjusted for minimum internal noise, and is equipped with an efficient motor ignition noise trap. The vibrator "B" unit is of latest, non-synchronous type, with readily adjustable contacts. The volume control is designed to maintain good bass response at low volume levels. This set is supplied with a kit of spark suppressors, etc.; the installation manual furnishes complete information on the elimination of noises due to: (1) antenna pickup; (2) antenna lead-in pickup; and, (3) noise conduction into the set via the battery cable.
Remarkable improvements in car sets are indicated these diagrams of the new automotive radio receivers shown on the preceding page.
Posted June 1, 2016
Radio Service Data Sheets
These schematics, tuning instructions, and other data are reproduced from my collection of vintage radio and electronics magazines. As back in the era, similar schematic and service info was available for purchase from sources such as SAMS Photofacts, but these printings were a no-cost bonus for readers. There are 152 Radio Service Data Sheets as of November 14, 2016.