In his original post on the subject Phil wrote:
>>> Has anyone experimented with using a remote Tuner (LDG, MFJ, etc.) near the
>>> antenna to reduce losses in the coax to the rig? What would be the results
>>> in say, using a remote tuner on a ZS6BKW after the ladder line conversion
>>> to a SO239 for coax? ... If a low SWR is obtained at the remote tuner, my
>>> thinking is the loss on the coax run to the shack would be very low.
If by "experimented with" you wish to include modeling in addition to "real
world build it and test" then EZNEC or the combination of EZNEC and AutoEZ can
help. With EZNEC's "L network" feature you can model a remote auto-tuner
(including coil and capacitor losses) and with EZNEC's "lossy transmission
line" feature you can include transmission line losses in the model. Using
AutoEZ lets you greatly simplify the steps needed to build the model.
So you could, for example, model one configuration with the tuner located in
the shack and another configuration with the tuner at some remote location and
then compare total system loss (including tuner loss and transmission line
loss) between the two.
For a detailed example of modeling an auto-tuner see the second bullet here:
http://ac6la.com/aetltu.html
Note that the antenna in that example is a simple dipole but the steps needed
to model the tuner are the same regardless of the antenna.
For some examples of including transmission line loss in a model see the last
three bullets here:
http://ac6la.com/aecollection7.html
Again, let me stress that this is all "modeling" as opposed to "I built exactly
what you described and this is my experience."
Dan, AC6LA
http://ac6la.com
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