In article ,
Richard Clark wrote:

Loss is in the resistance of the copper wire. The copper wire of the
center conductor of coax is the limiting factor. Except for the
largest ($$$) grade of coax, that copper center conductor is usually
smaller than the average (¢¢¢) grade of twin lead's conductors.

Given the same SWR, you probably can now appreciate why one is less
lossy than the other. If your twin lead still has too much loss,
replace it with larger conductor (still ¢¢¢ at most bulk wire
outlets).

It's not just the wire gauge. Twinlead and ladder line and open-wire
line have a higher characteristic impedance than coax. Assuming a
matched source and load, the ladder line will carry any given amount
of power with a higher voltage across the line, and a lower current
through the line, than a coax will.

Losses are proportional to (I^2*R), and so you can decrease the losses
by either decreasing the resistance (larger wire gauge), or using a
higher-impedance matched feedline (lower currents).

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
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