"Bob Bob" wrote in message
...
Hi John

As I remember too if you use plastic conduit (in VK) the orange stuff
has no carbon but the grey stuff does. ie it has carbon mixed in when it
is extruded.

I don't know how good that info is, it's comes from way back in
anecdotal land. I just assume grey stuff is not to be used for radio
antenna system!

I have heard the same thing, but have used the grey conduit for antenna
construction in the past. I noted that a 2mtr band slim jim (J pole variant)
antenna had the same low SWR with and with out being inside a length of 32mm
grey conduit. I would assume some affect on the SWR if there was any
interaction.

--
Peter VK6YSF

http://members.optushome.com.au/vk6ysf/vk6ysf/main.htm