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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January 1932 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 interesting. The title for the General Motors S1B radio says it is a 25-cycle model, as compared to the S1A, 60-cycle model. According to an IEEE Xplore paper, "At 8:53 PM on 12 October 2006, a 66-kV circuit breaker tripped and locked out at the Harper Substation in Niagara Falls, New York, due to downed transmission conductors near Buffalo, New York. That event marked the end of over 111 years of 25-Hz alternating current (ac) electric power service on the American side of the Niagara Frontier." 25 Hz was considered a good, low frequency for conversion to DC, which was in common use in the early 20th century. The world did not standardize on 60/50 Hz until after World War II.
Posted March 2, 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 156 Radio Service Data Sheets as of December 6, 2016.