1939 CAA Type TZG Fan Marker Transmitter Manual Federal Telegraph

Original instruction manual for the Type TZG Dual Ultra-High-Frequency Fan Marker Transmitter, operating at 75 Mc. (75 MHz) and manufactured by the Federal Telegraph Company, Newark, New Jersey.

The manual was manufactured for the U.S. Civil Aeronautics Authority under:

• Contract CAA-456
• Order No. 40-1621
• Dated October 10, 1939

This is an early aviation radio-navigation technical manual dating immediately before U.S. entry into World War II. Fan marker transmitters were part of the early radio navigation and instrument-landing infrastructure used to provide position indications to aircraft.

Of particular interest, this example includes period 1957 correspondence from the U.S. Department of Commerce, Civil Aeronautics Administration, concerning a requested copy of the TZG instruction book. One letter dated March 28, 1957 was sent to Engineering Associates in Dayton, Ohio and identifies the enclosed publication as the TZG Fan Marker Transmitter instruction book.

Additional correspondence dated May 27, 1957 discusses the return of a TZG instruction manual that had been loaned for evaluation, providing unusual period provenance associated with this technical material.

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