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hi..in new zealand lf ops have found in heaverly biult in
or eclosed areas loops work better than any form of verical system...loops of
wire say 100ft across between poles what ever and down wires to ft or so above
ground back to a feed point..poles 30 to 40ft..they work up and down zl
and into vk if things up stairs in good mood....connection is done by capacitors
for tuning and z match....lower loops grounded you have to be clear of
power cables etc...especialy if your ac 230v is a multiple earthed
neurtral system as used in zl 73 george zl3pn
----- Original Message -----
Sent: Wednesday, January 23, 2008 12:04
PM
Subject: LF: Low long wires
Ive only had partial success in low long wires up in Alaska -
but my s/n failure was due to a 33Kv or more power line running parallel
underground just a few feet below the array for most of the way - that and the
variable speed drives from the local water pumping station which the power
cable supplied.
Im going to put "down" or it is "up" a
couple in a heavily birch wooded area in Alaska above moose antler height and
they will be insulated off but supported by the trees. Ive just gained
another painful acre so will have wires up to 100m in length or so - I
have silt sand and ground water at around 12 feet in depth close in by a
freshish water (ice at the moment) lake.
So -
question what effect will the trees have decoupling LF signals in this
type of medium (?) Z array given the travelling wave aspect? Does anyone
else have experience against open space wires .v. in wooded areas? On
the TX side I see this without a lot of clearing as another large TX
loop experience - just too many tall decoupling signal Birch for
verticals at the moment.
Laurence
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