[TowerTalk] FW: In Shack Tuner Vs. Remote Tuner for Multi-Band Antennas

[Paul Christensen]

> The philosophical objection I have is that you can't build an effective 
> choke for the ladder line to prevent it from being a radiator.

Nor prevent it from being a noise receptor.  Ladder/open feeders can offer 
excellent balance on transmit, but on receive, a noise source can arrive 
from any angle to the line.  Perpendicular to a perfect line, the noise will 
cancel, but off to the side, it wont.  Small changes in geometry affect a 
balanced line's ability to cancel noise on receive.

With so many switched noise sources in my home, there's no way I can run 
balanced feeders from my shack, through the attic, all the way to the line 
exit point on the opposite side of the house.  A balanced line running 
through the attic is an antenna for every home noise source.  To cope with 
this, the tuner is installed outside the house with coax run between the 
tuner and shack.  Then, 600-ohm open feeders route from the tuner to the 
antenna feed point.

Paul, W9AC