Articles and Technical
Information on Crystal Radio Design, Edison Radios, Late 1920's
TRF Radios, Antique carbon-type Hearing Aids and Blonder-Tongue
Labs
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This Section contains 29 original
Technical Articles relating to Crystal Radio Set Design. Many have application to areas other than crystal radios
such as diode detector power loss and the 'linear to square-law crossover
point' (LSLCP), measurement of diode SPICE parameters, ferrite inductor
and variable capacitor Q, impedance matching, headphone impedance and
transduction loss measurement, audio transformer loss and measurement,
along with many tutorial notes. |
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The Edison Company entered the radio field early in 1929
in an attempt to reverse a drastic downturn in their home entertainment
phonograph business. About three-quarters of a year later,
because of increasing losses, they closed that part of their
business to concentrate on radios. Unfortunately,
the radio effort did not live up to expectations, and was closed
at the end of 1930. Many of the documents shown here were
copied directly from the originals in the Edison National Historic
Site: Minutes of internal meetings related to radio design and
manufacturing, User and Service data on Edison Radios, copies
of advertisements, and Corporate Annual reports of the Radio
Division (Splitdorf Radio Company). |
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TRF Radio Receivers for the home reached their peak of development
in the 1928-1929 time frame. Technical performance data of many
of these receivers, as well as the IRE Receiver Measurement Standard
as of 1929, may be found in this Section. |
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This Section includes Information about Antique Hearing Aids such as copies of User
Manuals for Acousticon carbon-type electric hearing aids from about
1926 and articles from Radio-Craft magazine of Oct 1938 about Hi-Fi
hearing aids and hearing aid testing methods. |
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Here is some information about Blonder-Tongue Labs and Ben H. Tongue |
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Links |
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Copyright notice:
Everything on my site is copyright 1999-2010, Ben Tongue. All
rights are reserved. If you wish to use anything on this site
(pictures, text, downloads) for non-commercial purposes, please
ask. It is highly likely that I will say yes. Ben
H. Tongue
This page published: 10/04/2006; Revised 01/06/2010
020610 |