05-04-2018, 07:29 AM
Hi all, I wouldn't go there. Period.
Looking at the 8el azimuth pattern, a 9db dip is not acceptable.
There was NO mention of the Vertical component of the radiation.
The 9:1 balun, that's the easiest thing at a fixed frequency.
Two pieces of 9mm copper pipe 1/4 wave long....
Saw a hole in one 1/3 the way up etc...
Maybe brass angle would be easier: >< coax in the groove one side.
Lastly, the vertical spacing of the dipoles should be 0.65 wave for best gain.
The need for a non-conductive support mast also precludes running a coax
up and putting another antenna on top of it eg. 23cm.
Too hard
Looking at the 8el azimuth pattern, a 9db dip is not acceptable.
There was NO mention of the Vertical component of the radiation.
The 9:1 balun, that's the easiest thing at a fixed frequency.
Two pieces of 9mm copper pipe 1/4 wave long....
Saw a hole in one 1/3 the way up etc...
Maybe brass angle would be easier: >< coax in the groove one side.
Lastly, the vertical spacing of the dipoles should be 0.65 wave for best gain.
The need for a non-conductive support mast also precludes running a coax
up and putting another antenna on top of it eg. 23cm.
Too hard