[Elecraft] [OT] Grounding Antenna when not in use
Tom W8JI
w8ji at w8ji.com
Fri Mar 19 19:35:45 EDT 2010
After I get my kit built, I¹ll be operating with a windom
antenna on 40
10. It¹s been suggested that when I¹m not operating, I
should disconnect
the rig from the antenna and run the antenna to ground.
I¹ve never done
that in the past when I operated with wire antennas or my
vertical, but it
does make sense as a safety precaution. I¹m wondering if
anyone has any
suggestions about the best way(s) to do that? Are there any
pieces of
equipment that you would recommend to simplify the process?
Any help would
be greatly appreciated. Thanks.>>
Chuck,
Nearly all the time when there is serious damage, it comes
from a loop from power lines to your antenna and station
ground.
http://www.w8ji.com/ground_systems.htm
You either MUST have a proper station ground bonded to the
power mains ground and a bulkhead entrance, or you really
would have to take the rig totally out of line. No power
supply connections, computer connections, antenna, or
anything.
Although it is popular, grounding the antenna when off
really means next to nothing. It can help if a hit is a mile
away, or from p-static charging, but it won't do a thing if
lightning hits the mains (very common) or the antenna (very
rare unless you have a tall tower).
For automatic antenna disconnect and static shielding you
really need a double-make double-break relay, in a proper
box with proper layout, to totally isolate the center
conductor. It has to be a properly configured double-make
double-break that grounds the transfer bar when the relay is
off. Any other type of relay or switch is not secure at all.
Tom
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