. Bell telephone magazine . Tower frames are placed on roof of stationbuilding for TD-3 microwave system trial. 58 against 600 on TD-2—or a combination ofphone calls, data and intercity television. TD-2 has effectively handled this jobsince its introduction in 1949 and its pres-ent production is at an all time high. Butwith the unprecedented growth in traffic inthe intervening years, the saturation pointon available frequency band transmissionspace was fast approaching. Bell Labora-tories engineers worked with Western Electricand Long Lines people to developthe new larger capacity syst
. Bell telephone magazine . Tower frames are placed on roof of stationbuilding for TD-3 microwave system trial. 58 against 600 on TD-2—or a combination ofphone calls, data and intercity television. TD-2 has effectively handled this jobsince its introduction in 1949 and its pres-ent production is at an all time high. Butwith the unprecedented growth in traffic inthe intervening years, the saturation pointon available frequency band transmissionspace was fast approaching. Bell Labora-tories engineers worked with Western Electricand Long Lines people to developthe new larger capacity system. TD-3s trial towers will rest on stationbuildings housing the power, amplifying andtesting apparatus. This new roof-mountedconstruction will shorten and straighten thewave guides which conduct the microwavesignals from the station transmitter to theantennas at the top of the towers. Five watts of power—less than theamount needed by a typical Christmas treebulb—is sufficient to send microwave signalson their way
Size: 2854px × 876px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
