RF Cafe Software
About RF Cafe
1996 - 2022
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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January 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.
January 1930 was not long after Black Friday on October 29 of 1929. Buying radios was not at the top of everyone's priority list as most of the country scrambled to batten down the hatches for the economic storm on the horizon. Many top pundits thought the disaster would be short-lived, but it lasted for more than a decade. It took World War II to finally end the national malaise. The photo of the Steinite 102-A radio was found on the RadioMuseum.org website. It is a fancy console (floor) model.
On the terminal strip of this receiver are mounted: the power-cable lugs; the grid leak and condenser; the detector-plate bypass condenser; the two center-tap resistors; and the 600-ohm and 2500- ohm "C-bias" resistors.
A special input circuit is used on the Steinite receivers, for the purpose of obtaining sensitivity. The circuit acts as an autotransformer when the antenna lead is connected at the junction between L1 and C1. The purpose of R1 is to complete the D.C. path for the grid bias.
Any hum which may develop is ordinarily trace able to the detector; particular care taken in the selection of a detector tube when first setting up the receiver will result in best operation over an extended period.
Posted October 28, 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 185 Radio Service Data Sheets as of April 12, 2017.