Norm,
Keep the feedline away from conductors by 3 times the line spacing -
more if you can. You may be able to find TV standoffs for 300 ohm line.
An end fed Zepp antenna will work nicely if it is 1/2 wave long and the
feedline is 1/4 wave (or any odd multiple). If those conditions are not
true, it is not a classic zepp antenna.
Look at the popular J-pole antennas, they are nothing but a classic zepp
antenna oriented vertically (the J part is the 1/4 wave transmission
line - high impedance at the open end, and a low impedance at the 1/4
wave point - so the bottom can be shorted with the 50 ohm point up a bit
from the short)
73,
Don W3FPR
Norm Klieman wrote:
> I am thinking of feeding an end fed zepp using 300
> twin lead for mh K1. My shack is in my basement. How
> careful do I need to be with the twin lead around
> ceiling conduits, pipes and air vents? Is there a good
> rule of thumb for how many inches I need to stay away
> from these items or am I just overthinking here??
> Thank for the feedback! 73's -- Norm K9NK
>
>
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