On Tue, 15 Dec 2015 14:40:40 +0000 (UTC), Laszlo Lebrun
wrote:
Is it allowed to post here a question related to antennas and
without
crossposts? :-)


Reading the content of the other threads, I'm not quite sure...


OK let's try nevertheless:


A colinear antenna is using alternating sections if coaxial cable
whereas
the signal is travelling half inside the coax, half outside.
The length of the sections should be half wave considering the
velocity
factor of the used coaxial cable.


I would tend to consider the velocity factor only for the parts of
the
antenna where the the signal is travelling *inside* the coax cable.


I know, my reasoning is probably wrong, but why?


Thank you for your advice

Great question. I'd think that each section radiates from the
outside and velocity factor doesn't apply. Thinking more about
it....I don't know.