0

December 8, 2010 AT 11:01 am

Western Union’s Microwave Telegraphy Network

Western Union was one of the first to use radar-wavelength waves for telecommunication. From David Rotenstein’s blog:

In March 1945 the Federal Communications Commission (FCC) authorized the Western Union Telegraph Company to place into service an experimental microwave relay system between New York, New York and Philadelphia, Pennsylvania. The system to beam telegrams between stations used radio frequencies that had previously only been used by military radar systems.

The experimental system that used unattended stations placed at regular intervals to facility a line-of-sight radio relay allowed Western Union to refine the radio beam telegraphy process by improving its equipment to maintain constant signal strength. The equipment used in Western Union’s experiments was made by the Radio Corporation of America (RCA) under license to Western Union. The company’s goal was to develop a system that increased the capacity for sending telegraphs, to eliminate much of the company’s wireline reliance (i.e., make poles and wires obsolete) and to position it for providing transmission services for emerging television technology.

Western Union designed its system by incorporating two facility types: terminals and relay stations. In March 1945 the FCC authorized the Western Union to place into service an experimental microwave relay system between New York, New York and Philadelphia, Pennsylvania. This network linking New York and Philadelphia included terminals in Philadelphia and at the company’s New York City headquarters. Relays were planned at Bordentown, Ten Mile Run, and Woodbridge, New Jersey. The New York-Washington-Pittsburgh network incorporated the New York headquarters, a rooftop location in downtown Pittsburgh, and a new tower building for the Washington, D.C., terminal. Each terminal was connected by nodes in the network: unattended relay stations with towers and equipment buildings.

More here.

Neat!


Check out all the Circuit Playground Episodes! Our new kid’s show and subscribe!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground”Adafruit’s Apps!


Maker Business — Raspberry Pi and CoderDojo Join Forces

Wearables — Gold glow

Electronics — Linear Love

Biohacking — Read Faster Using JETZT or SPEEDREAD

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.