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 ...
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October 1930 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.
This is a standard radio receiver merchandised under a number of individual trade marks. For instance, Wextark Radio Stores, Inc., of Chicago, distribute this chassis; and so does Allied Radio Corporation, Chicago,. Its manufacturers are the Columbia Radio Corp., Chicago, Ill. If oscillation exists, only between 95 and 100 on the tuning scale, changing the RF. chokes above mentioned for units having 650 or 675 turns will probably eliminate this tendency, which may exist in a few instances. The reason for this circuit oscillation is that the chokes are designed to resonate at a wavelength just above the upper end of the broadcast band; this results in obtaining more even amplification throughout the tuning band.
Posted July 29, 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.