450Ω Ladder Line Attenuation




Chart provided through the courtesy of N7WS

551 - #18 AWG
Solid
552 - #16 AWG
Stranded
553 - #18 AWG
Stranded
554 - #14 AWG
Stranded


This chart displays the measured attenuation for four 450Ω ladder line types obtained form The WireMan.

There two things you should be aware of. First, none of the so called 450Ω lines' characteristic impedance is 450Ω. They range between about 370Ω to 410Ω. Secondly and more importantly, the results shown are for clean dry ladder line. If it is wet, dirty or both the losses will be substantially higher.

An excellent paper on this subject by Wes Stewart, N7WS, was published in the ARRL Antenna Compendium - Volume 6, titled "Balanced Transmission Lines in Current Amateur Practice". This paper and additional information on ladder line can be found at N7WS's Web Repository