[Elecraft] wire for random wire antenna using kx3

[Bob McGraw K4TAX]

Be sure the wire is LCOF copper.  The electrons are reported to move 
faster and with less resistance in that medium.  This makes your signal 
get to the DX station faster than anyone else .     HA HA HA

Seriously folks,   to evaluate the insulation on the zip cord or speaker 
wire, my method is to strip off about 6" of the insulation.  Be sure 
there's no copper left inside.  Then put the insulation in the microwave 
along with a cup of water for a microwave load.  Heat for about 30 
seconds.    If the insulation is hot, it is not good for RF 
properties.   If the insulation is cool, it is OK for RF.     I would 
suspect that color may have different results.   Try clear, brown, 
white, black to see if there is any difference.

If the insulation melts............clean the microwave before the XYL 
discovers the mess.

I find that #16 to #18 zip cord, is nominally about 75 ohms Z and in my 
portable operation I work with 100 watts without any known issues.

73

Bob, K4TAX