Cle Elum Tower

This is an AT&T microwave radio relay tower located in Cle Elum, Washington. A friend and I hiked up this mountain in late 2010.

Coordinates: 47-7-57.05N 120-53-7.34W
FCC ASR Registration Number: 1281229
Height: 67 feet above ground
Total Height: 3937 feet above sea level
Owner: American Towers, Inc.

View Map

Microwave relay tower in Lightfoot, Virginia

Took a picture of the microwave relay tower in Lightfoot, Virginia the other day. Thought I’d share…

During the 1950s, the AT&T Long Lines’ system of microwave relay links carried the majority of US long distance telephone traffic as well as intercontinental television network signals. The main motivation to use microwave radio instead of cable was that a large capacity could be installed quickly and at less cost. It was expected at that time that the annual operating costs for microwave radio would be greater than for cable. There were two main reasons that a large capacity had to be introduced suddenly: Pent up demand for long distance telephone service, because of the hiatus during the war years, and the new medium of television, which needed more bandwidth than radio.

Lucent technologies – Bell Labs Innovations

Lucent technologies – Bell Labs Innovations

Alexander Graham Bell

Thomas Watson

Teddy Vail

George Campbell’s wave filter

Calling ship to shore

Frank Jewitt

Harold Black

Negative feedback


Fax machines

More, more, more

Hi Fi, talkies

Movies, sound

Laying copper by the pound

Systems engineering

Quality control

Karl Demke

Herbert Ives

Davisson wins Nobel Prize

First speech synthesis

Beethoven in stereo

Bell Labs Innovations

Communications for the next generation

Bell Labs Innovations

Our contribution to the revolution

Ollie Buckley

Mobile phones


John Pierce

GI Loans

George David


Voice technography

Claude Shannon


Richard Hamming

William Fan

Crackerjack transistor team

Bardeen, Brattain, Shockley

Transatlantic cable

A transistorized computer made

Non-blocking networks

Macro coding scheme

Oxide masking

Solar cells

Transistors win the Nobel

Art [Schawlow] and Charles [Townes] what a team

They invent the laser beam

Bell Labs Innovations

Communications for the next generation

Bell Labs Innovations

Our contribution to the revolution

Mervin Kelly


Foil electret microphone


Telstar I

Digital transmission

Long distance dialing

First ever paging


Ion implantation



Magnetic bubble memory

Penzias and Wilson

Hear the big bang noise

Automated switchboards

Ever moving forward

Jim Fisk

1E switch

That’s our attitude, do it, boys!

John Tukey

Carbon dating

Ken and Den built UNIX

Bill Baker

Quantum wells


C language


Fiber optics will endure

Electron beam lithography

Anderson wins Nobel 3

Linc Hawkins

Amos Joel

Tom McChesney

Alfred Cho

Packet data



Transmitting mobile microwaves

Solitons without their phase

Transistors getting so small

You can’t even see them

Bell Labs Innovations

Communications for the next generation

Bell Labs Innovations

Our contribution to the revolution.

Echo canceller


All on one chip if you please

Penzias and Wilson win the Nobel Prize

Bell Labs gets a new boss

By the name of Ian Ross

Lightwave goes long distance

Cellular gets digitized

S language

C++ – reuse code without a fuss

Femtosecond pulses

Deep UV lithography

Software windows on our screen

Gigabit transmission seen

Tunable lasers

Programming that’s sharp as razors

Bell Labs Innovations

Communications for the next generation

Bell Labs Innovations

Our contribution to the revolution

Megabits on a chip

First electro-optic switch

Atom-trapping micro cells


Transatlantic lightwave cable

Bell Labs led by John Mayo

Neural networks



RBM builds amplifier

Data nets without the wire

Operating Systems

Software methodology

Optical cross-connect

Jin Leong is President

Bell Labs spins out technologies

See the mighty SCALPEL

C2 waves Nobel


Atom glide

X -ray Microprobe

Imaging buffer lobe

Circuits on plastic

Lasers that are bow tied

Internet telephony

Microphones the size of fleas

St’rmer, Loughlin, Tsui win a Nobel prize

Free space optic benefits

? router softswitch

Netravali needs the help

Lucent’s start is on the rise.

Bell Labs innovations

Make communication for the next generation

Bell Labs innovations

Our contribution to the revolution

iPhone 4 Quote

Knowing the interest in every new Apple iPhone, and knowing that there are millions of people eligible for this admittedly very attractive upgrade, how could this be? How could AT&T not expect this kind of massive load on their servers? Perhaps they used the same prediction software they use to plan their cellular network.

From somewhere on