[Antennas] Technical Question Re: Transmission Lines

[Dr M J DiGirolamo]

Hi Chris,
 
  Thanks for your comments.
 
  I have: 
    1. an entrance bulkhead (outside the shack), 
    2. a lower tower bulkhead and, 
    3. an upper tower bulkhead - where each line joins jumpers to each antenna
(topmost jumpers are more flexible cable to allow for rotaton). 
 
  Antennas cover HF to 1.3GHz and utilize different feedlines to minimize loss.
 
  If you have comments, please forward them - I'm always interested in hearing
the opinons of others.
 
73,
 
Mike DiGirolamo, W4XN
 
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I would think as long as the Z of the different pieces are the same in each
line, you shouldn't have to worry...Velocity factor would affect you in a
phased array or similar situation but I don't think you have that situation
here....size should not be an issue unless the SWR is high at the antenna,
then you could possibly have a voltage/current issue in the smaller
sections. Of course, the loss in each piece will determine your overall loss
in each line..curious as to WHY the 3 bulkheads? Is there a way to make it
only one or none?
Chris
WB5ITT