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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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.
These values are measured from the point indicated to ground and are read with a 1,000 ohms-per-volt meter. The line voltage is 117.5 V. 'The oscillator plate is 170 V. "This value is measured across the filament terminals. The voltage across 'the speaker field is 70 V. To align the I.F. stage, set the receiver tuning condenser to minimum and adjust the oscillator trimmer for maximum response, then adjust the broadcast antenna trimmer likewise.
Be sure to choose the minimum peak capacity on the oscillator trimmer. The broadcast band is aligned with a 200-mmf. condenser in series with the antenna lead. Set the receiver dial pointer at 600 kc., and adjust the broadcast series padder for best response. Move the pointer to 1,600 kc. and connect the output of a service oscillator to the cap of V1.
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.