Hello Group,
Have a dual antenna system for a 2M repeater. Decibel DB-222 top
mounted, clears the tower and is oriented for omni-directional
coverage. TX antenna is directly below and is side mounted on the
southwest side of the tower. The antenna is a Celwave PD-340-3 with
dipoles oriented around the mast (omni). It is mounted on the corner
(not the face) of Rohn 25-G and is a factory mount and top sway brace
from Decibel Products and they recommend this for side mounting DB-
224's. The mount lets the antenna extend around 22 inches from the
leg of the tower.
I am noticing VERY significant deficiencies in TX coverage back
through the tower, even what I would estimate 8 to 10 dB. In other
directions, it seems as if the coverage is as good as can be
predicted.
I have heard someone mention that taking all four dipoles on the same
side of the mast and directing the elements straight into the tower
would create more of an omni pattern. I can't remember if this was
for UHF or VHF. I would like to eliminate any deep nulls, no more
than 3 dB down in any direction if possible. Will turning all
elements towards the tower help my situation?
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