Gil Johnson, W1DZ, designed Crystal Controlled CW transmitter from the 1930s.
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This is the Ca. 1930 CW Transmitter in the NEWSM collection. We refer to it as the Frankenstein transmitter.
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George Grammer designed Single Control CW transmitter based on the December 1929 article in QST magazine.
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George Grammer designed Single Control CW transmitter based on the December 1929 article in QST magazine.
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This is the third Ca. 1934 TNT CW Transmitter in the NEWSM collection. Please see the George Grammer Designed TNT (Tuned-Not-Tuned) Transmitter #1 for design details and reference material. This TNT Transmitter was made by an unknown home builder. As with TNT #1, it is built according to the plans in the December 1929 issue of …
Continue reading "1930s George Grammer Designed TNT (Tuned-Not-Tuned) Transmitter #3" →
Tuned-Plate Tuned-Grid CW transmitter similar to the design in the December 1929 article in QST magazine.
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This is a Ca. 1930 TPTG CW Transmitter in the NEWSM collection.
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Made for U. S. Army Signal Corps.
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Built for the U. S. Coast Guard.
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E. F. Johnson of Waseca, Minnesota made amateur radio transmitters and receivers in fully wired and kit form.
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Made for the U. S. Army Signal Corps.
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Similar artifact at the Smithsonian Institution Air & Space Museum →
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Made for the U. S. Army Signal Corps. In leather case, with key, sounder and space for batteries.
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Short Range Radio Telephoning Set for 32 Volt DC supply consisting of:
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In canvas case with carrying strap. With telephone-style handset.
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Wood case, with key and headphone.
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