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 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 receiver is so designed as to permit the use of aerials of widely differing characteristics. In addition to being adaptable to aerials of the usual type, it makes provision for use of the light-line, if satisfactory operation results when the R.F. input is taken from the light-line through C13. (Sw. 1 on tap L.). If the light-line is being used as the aerial, reversing the line plug may improve reception. Volume control is effected by varying R2. This varies the grid-bias potential on tubes V1, V2 and V3. The first tube V1 has a tuned input and its synchronism in relation to the other tuned circuits, is accomplished through a trimming condenser, C5, controlled from the panel. The detector output of this receiver may be tapped to any external equipment, by connection to posts provided on the rear of the receiver. Specifically, it is intended to make convenient the operation of television equipment by connecting to binding posts BP1 and BP3. Also, the detector input may be tapped for operation of a phonograph pickup, by connection to posts BP1 and BP2. There is no switching device for disconnecting the pick-up: for its leads would introduce a capacity that would impair the "phase" conditions, (resonance of the stages) of the set; consequently, the pick-up connections must be removed from the receiver when only radio reception is desired...
Posted June 9, 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.