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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July 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.
At least for now, I am going to only scan and post schematics & parts lists like this one featuring the Atwater Kent Model 305Z 5-Tube 32 V. D.C. Superhet radio in graphical format, rather than run OCR on them to separate the textual content. There are still many people who restore and service these vintage radios, and often it can be difficult or impossible to find schematics and/or tuning information. I will keep a running list of all data sheets to facilitate a search.
(Has 3 wave bands; dynamic speaker; dual-lighted dial.)
The voltages for this receiver are shown on the schematic diagram near the portions of the circuit to which they apply. When aligning the set, the volume control should be turned on full and the tone control set at high pitch. For trimming the R.F. end of the set, it is best to connect a 250 mmf. condenser in series with the antenna lead of the set. When the I.F. is aligned, one of the manufacturer's coupling units should be connected, the unit being placed on the control-grid cap of the I.F. or first-detector tube as needed, and the lead from the circuit connected to the coupling unit. The dial pointer should be at 538 kc. when the rotor of the tuning condenser is fully meshed. The short-wave range is aligned at 15 mc. and the broadcast range at 1,500 and 560 kc. There is no trimmer for the police band. Align the I.F. transformers at 264 kc.
Posted August 27, 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 156 Radio Service Data Sheets as of December 6, 2016.