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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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.
RCA Victor M-104 (and M-108): The M-104 is a single-unit receiver; the M-108 has the reproducer separate from the set assembly. From antenna to reproducer, this car-radio receiver has been designed for interference-free operation without recourse to suppressors. The ground-end of the antenna coil, for instance, is not grounded directly at the receiver chassis, but is carried to a point on the car frame at which circulating noise currents do not become mutual to the receiver input; the R.F. transmission line favors broadcast signals and greatly attenuates interference frequencies. A self-rectifying, synchronous plug-in vibrator "B" unit is used. A tone- or speech-clarity control.
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 185 Radio Service Data Sheets as of April 12, 2017.