RF Cafe Software
About RF Cafe
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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December 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.
This receiver designed for high-fidelity phonograph, as well as radio reproduction has a "Phantom Control" (second from the left - see front view of chassis for positions of controls) which permits turning in either the (position B). Automatic Frequency Control alone, which holds the receiver tuned to the strongest signal within 20 kc., or both the A.F.C. and the Phantom Conductor Tube. V11 (position C). The feature of the Phantom Conductor tube is that it contains 2 resistors with such a thermal characteristic that, when connected across the speaker voice coil, it increases the volume of loud tones. This is particularly designed to compensate for the limitations of broadcasting equipment, which cannot give full volume to the loudest passages, and should have the same effect with phonograph music. When this control is at position A, neither A.F.C. (the "Mystic Hand") nor Phantom Conductor is operative. This permits operation with normal power output and fidelity. The fidelity control is incorporated with the power switch. The volume control operates on both A.F. grids (V5, V6). The band-selector switch operates also a tone filter.
Posted May 25, 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 177 Radio Service Data Sheets as of February 17, 2017.