Re the grey vs orange/white stuff (In VK at least)

The grey electrical conduit has graphite (I think) added and therefore
has some conductivity.

What I am getting at is that with a design using (say) white material
there will be slight dimension differences when using the grey stuff.
Apparently it isnt good to use it for a colinear etc design where the
radiating elemnt is inside the pipe.

Cheers Bob VK2YQA


wrote:
Will sch 40 pvc be ok for a 440 mhz boom? Or will it eventially warp in
the sun? (We have brutal summers sometimes).