Quick answer is no. The electric and magnetic fields on ladder line extend
out to several times the wire spacing. (Out to infinity, actually, but
maybe 3 - 8 X for practical work.) Anything inside that radius will affect
the impedance and/or loss of the line. So, if you're willing to put it
centered in an 8 - 12" pipe (all by itself), it might work. (Actually, it
becomes a kind of twinax if the pipe is conductive.)
You can use transformers (baluns) to convert from balanced line to coax and
back, but they want to work close to 1:1 SWR, and they have losses.
73 Martin AA6E
On Fri, Nov 21, 2008 at 5:58 AM, Barry Merrill <email@example.com> wrote:
> A question from my Best Man, F/K9ORP:
> Can Ladder Line be run thru underground conduit under a road
> to feed antennas on a tower across the road, with no impact?
> By itself?
> Would a mix of coax and ladder line also work?
> Barry, W5GN
> TowerTalk mailing list
Martin Ewing, AA6E
TowerTalk mailing list