The Bell System's Microwave Radio and Coaxial Cable Networks
Historical and Commemorative Publications
AT&T's First Microwave Radio Route
"The Latest Word in Communications"
In 1947, AT&T inaugurated an experimental microwave radio link, connecting Boston and New York City. This brochure was published by the Long Lines Department to describe the system's technology and facilities. (16 pp.)
Document courtesy of Mr. Sheldon Hochheiser, Corporate Historian, AT&T.
"Seven Towers on Seven Hilltops"
A 1947 magazine advertisement announcing the Boston - New York link, featuring a photo of a relay station.
Microwave Radio Equipment and Operations
Early Microwave Towers
Advertisement showing concrete radio-relay tower
From the October 1951 issue of Atlantic Monthly magazine.
The Coast-to-Coast Radio Channel Evaluation Test
Beginning in August of 1967, the Long Lines Department conducted a test to measure the performance of AT&T's TD-2 microwave radio equipment in a coast-to-coast link.
Selected pages from the test report
Notes on terminology:
TVS stands for television section, a category of radio route. It consisted of one or more video units in tandem.
A video unit was all of the radio facilities between either: two television operating centers, or between a television operating center and a radio junction point.
A television operating center was a control point for AT&T's transmission of TV network programming.
A radio junction point was a microwave station where several radio routes converged/diverged.
Cable and radio routes, circa 1951
From "Audels Television Service Manual", by E.P. Anderson (New York, Theo. Audel & Co., 1951)
Note: The text does not explicitly identify this as an AT&T network map. It is believed to be such, based on available information about AT&T's cable and radio routes of the era.
AUTOVON switching centers in the continental US, Sep. 1979
AUTOVON switching centers in the continental US, undated, showing switch types
From the archives of the Defense Information Systems Agency, binder titled "AUTOVON".
Eastern Region BSRF Diagram
Shows how the Bell System Reference Frequency was distributed over the coaxial-cable network in the eastern United States
List of AT&T sites having Solar gas turbines
- New York Philadelphia Cross Section, Fundamental Planning document
The WT4 Long-Distance Buried Waveguide System
Protection Against Nuclear Blasts
The Solar Saturn Gas Turbine Alternator
The standard Bell System emergency power source, deployed 1963-1966.
Coaxial Cable Technology
Updated on November 15, 2011 at 23:47 by Albert LaFrance