"Dave VanHorn" wrote in message
...
I'm a bit confused over the construction of a vertical colinear.

The docs I've seen all are more or less the same, alternating half-wave
sections of coax or hardline.
The thing that's bending my head, is that there's a velocity factor inside
the coax, that presumably isn't there on the outside.
So, while a given section is a half wave on the outside, it's probably
more like 3/4 wave inside.

My understanding is that we are trying to get to a series of dipoles all
fed in phase, and yet this seems like it's not accomplishing that.

What am I missing?

Hi dave

I dont think you are missing anything. The feed points of each of the
radiating elements need to be in phase if 'broadside pattern max' is
desired.

Do you intend to build an array, or just trying to understand them?

Jerry