On Mon,10/19/2015 7:00 PM, Rich Hallman - N7TR wrote:
Has anyone had any problems with intermittent mixing from a close
broadcast station with a Crank-Up tower? I think I may have an issue
with one of my towers. Cranked up I hear mixing all over 80 meters
(Every 10 KC).....Cranked down its gone. I already eliminated the
antennas. Mixing gets very intermittent in wind as the tower moves
around.
I have no experience with crankups, so will leave most of this to
others. The fundamental cause though is less than ideal electrical
contact in a conductor.
Thoughts about grounding the top section to the bottom when fully
extended?
Definitely. Should be a short fat conductor from the bottom of the top
section the top of the lower section that it mates with.
Was thinking of grounding the coax at the top and bottom of the tower?
This is ALWAYS good practice, to prevent arc-overs between the tower and
the coax, which will fry the coax at the point where the arc occurs.
73, Jim K9YC
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