Transmission Lines

loading coils, history of transmission lines

Telephone Lines Connect the Coasts
http://www.ieee-virtual-museum.org/collection/event.php?id=3456816&lid=1


Telephone line audio interface circuits
Telephone to studio mixer interface
http://www.epanorama.net/circuits/teleinterface.html
(caution! pop-ups)

Telephone Timeline
http://www.greatachievements.org/?id=3625

http://www.att.com/attlabs/reputation/timeline/15tel.html
http://www.att.com/attlabs/reputation/timeline/telmore.html
http://jefferson.village.virginia.edu/albell/homepage.html

George A. Campbell and the Electric Wave Filter
http://ieee.cincinnati.fuse.net/reiman/11_2001.html

...  a chronology of Telegraph, Telephone and   Radiotelephone, the three services reaching across the Atlantic before the 1960 Echo satellite. 
http://www.netvalley.com/archives/mirrors/telegraph__radio_timeline-3.htm
(1880 - Oliver Heaviside's analysis shows that a uniform addition of inductance into a cable would produce distortionless transmission.
(It would be 40 more years before Bell Labs devised a practical method
of producing uniform inductance -- "permalloy" magnetic ribbon spiral
winding around a conductor. This would permit 400 WPM on the
New York-Azores Western Union cable in 1925.)

***** The Telegrapher's Equation *****
http://www.du.edu/~jcalvert/tech/cable.htm

http://www.iscpc.org/information/tlhistory.htm

ELECTRICAL CHARACTERISTICS OF TRANSMISSION LINES
http://www.ycars.org/EFRA/Module%20C/TLChar.htm

pulse reflection


http://www.hepl.hiroshima-u.ac.jp/hadron/phx/bnl/control/cable02/view01.html
http://www.hepl.hiroshima-u.ac.jp/hadron/phx/bnl/control/cable02/

http://www.thom-tech.com/tdr.htm

Transmission lines
If you look at the direction of displacement in the pulse, it reverses on reflection.
Thus, a wave of displacement to the right is returned as a wave of ...
http://personal.ee.surrey.ac.uk/Personal/D.Jefferies/transmission.html