[BC] Re:1 5/8 foam coax

[Gary Peterson]

" One poster here responding to this thread mentioned filling the line with
freon as a possible solution. I thought that the original post fas about
foam
filled line. At any rate, would freon really help? I would be tempted to use
SF6
(Sulfer Hexaflouride) assuming that there are no environmental or handling
complications.
Jeff Glass "

Assuming that you did use SF6 in an air-dielectric line, I would expect the
surge impedance to change.  I don't have a handbook handy, but I would
expect the dielectric constant of sulfur hexafluourde (and Freon) to
significantly different than dry air (70% N2) or nitrogen.  Wouldn't
altering the capacitance between the center conductor and the outer
conductor change the impedance, as the inductance/foot would remain the
same?

Gary, K?CX
Rushmore Radio Co.