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 ...
All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.
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July 1948 Radio News[Table of Contents]
These articles are scanned and OCRed from old editions of the Radio & Television News magazine. Here is a list of the Radio & Television News articles I have already posted. All copyrights are hereby acknowledged.
According to the Radio Museum website, B.F. Goodrich, of Akron, Ohio, manufactured the Mantola line of radio receivers. It was evidently a low quality, low price, short-lived run of models. The simplicity of the schematic shows the low parts count. A lack of multipole filter circuits likely means selectivity was fairly marginal. One good feature is that unlike many earlier radios and TVs, the AC line connection is DC-isolated through a 150 kΩ resistor (R13). Look at the schematics of older sets and it is not uncommon to see one line of the AC supply tied directly to the metal electronics chassis. An isolation transformer right at the input is the safest way to do it.
Schematics & Parts List
Posted June 17, 2015
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 161 Radio Service Data Sheets as of January 3, 2017.