What are the applications of a balanced twin coaxial line and an unbalanced coaxial line?
Answer:
There is no twin coaxial line. Its either twin or coaxial.
Twin lead usually has a typical impedanceof 300ohm or 450 ohm or 600 ohm, depending on wire spacing. Coaxial leads have impedances such as 52 ohm, 75 ohm. Which you use depends upon the impedance of the item being connected and/or if you use baluns, which are balance to unbalance connectors.
Twinax is very very good for noisy environments. Just got done with a low level rogowski coil detection board using twinax.
Also if you "make" a different sort of twinax eg: solder the outside returns of two pieces of RG-90 (which is normally 75 ohm cable) you can easily create 300 Ohm cable.
So it's uses are for noise immunity and impedance matching.
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