[TowerTalk] What coax is this?

[john at kk9a.com]

Teflon coax has a much higher power rating making it better for jumper  
cables after the amplifier, especially with high duty modes.  For  
example at 28MHz RG58 is rated for 600 watts average and RG400 is  
rated for 2500 watts average.

John KK9A



Jim Brown K9YC wrote:



Clarification for other readers. The center of RG142 is silver coated
copper coated steel, the center of RG400 is stranded silver-coated
copper. Both have double silver-coated copper braid shields.

Loss is about the same as RG58 -- in other words, fairly high. The
principal virtue of these cables is their superior SHIELDING, which is a
LOT better than most braided coax.  You only want to use this stuff for
short jumpers.

I've been happy with at least two purchases of Harbour Industries RG400
that I've found on ebay from a US vendor.  Harbour Industries is based
in VT, and has a presence across the border in QC. NA6O was happy with
the RG400 he bought from China.

73, Jim K9YC