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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February 1936 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.
The "sentry box" is the outstanding feature of this set. It contains all coils, the band switch, the R.F. tube V1, the det. 1 and osc, tube V2, and all components of the circuit associated with these units.
Before starting any adjustments on the set, it is advisable to make certain that they are needed, and the use of a "service wand" is the quickest way to do this. Holes are provided in the coil shields to admit the wand without disturbing any parts of the set, so that the test is made under normal operating conditions. (The wand consists of a rod of insulating material having a ring of non-magnetic metal attached to one end, and a small core of finely-divided iron at the other.) The following table shows what circuit adjustments are needed for various indications when using the wand.
Posted July 19, 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.