Definately go with 3-inch. Several years ago I
built my new house with two pvc conduits coming
under the slab into the ham shack from each of
two towers. I even planned this with a ham friend
who is an electrician and he suggested running
2-inch pvc, which I did.
This winter I found that the conduit from the
main tower was way too small. I had up a Force
C-4-XL, requiring two coaxes, rotor cable wire,
coax from a 2m/440 beam, and coax from an
80-meter dipole -- and did not have room for one
of these coaxes. Best to go bigger.
Although I have not tried running A/C through
there, you probably should not -- for both safety
and noise reasons.
Good luck with your project!
Crystal River, Fla.
Dhahran, Saudi Arabia
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