Farm and Ranch stores like Orchelns, Atwoods, Tractor Supply, etc sell
insulating tubing (plastic, don't know composition) for use with
electric fencing. It is 1/4 inch or maybe a tad less. My fence charger
is rated for over 200 miles of fence with a fairly high joule rating and
puts my digital meter (good for up to 10,000 Volts) into over scale ,
i.e. has more output than 10KV. I can have a wire insulated with this
tubing against grounded pipes or buried in conductive soil and not get
arcing to the pipe or the damp conductive dirt.
This stuff might just help stop an antenna from arcing to any part of a
tree. I haven't tried it with antennas as I have no need for that but
have used a lot of lot for underground distribution of the hot wire.
Patrick NJ5G
On 3/31/2017 3:39 PM, jimlux wrote:
On 3/31/17 12:25 PM, Jim Thomson wrote:
Ok, the peak V on the tips of a dipole is sky high. But what about
the polarity between
the ends ? If one end is + 10 kv, is the other end at – 10 kv
?? Is there a 20 kv
potential difference between them at all times ?
It's very hard to calculate (or measure) the actual voltage at the
ends - best you can say is "it's high". You can infer a voltage by
calculating the feedpoint impedance of a 1 wavelength long doublet,
then putting in 2x power (each half radiates full power), and using
Ohms law.
Yes, it would be opposite polarity. but not "at all times" because it
goes through zero every half cycle.
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