Giulio Scaroni wrote:
Hi to all,saturday
i have tested the our contest station in Mantova city in LF, and qso with
G in aural CW seems not a problem with a 80 meters long vertical wire,
slooping from the top of the tower, with 150 watts.But
wich may be the best sistem on this tower for LF, is possible to feed directly
it, may be at the top?The tower is exatly 80 meters
long, with a base of 8x8 meters,
That is the type of tower that I am looking for Guilio,
you should have an outstanding signal on LF with a good antenna attached
to your tower. Since your tower is grounded I would use it as a support
only for some inv L antennas displaced around the top of the tower and
insulated from it, all vertical drop wires converging at the bottom to
a loading/matching coil.
Another suggestion, use the tower again as a support
for a T antenna with each horiz section as long as possible but do not
let the ends get too close to ground and use a number of horiz wires if
necessary all insulated from the top of the tower, with one vert drop wire.
I use the inv L configuration and it works well for me.
With a tower insulated from ground the story would be
different, base fed with several horizontal long wires connected to the
top of the tower, however the conductivity of the tower might be poor and
lossy, the inv L
system might be the best approach.
Hope you find the info useful and thanks for the 579
report on 136 khz that you sent me last week.
and at 70 meters is 1x1 meters, and at 80 meters is 0.5x0.5
meters, so big antenna with big capacitance to ground, i think is a smaller
version of Decca insulated tower, but this one is grounded.Any
idea??The picture is at this site http://www.as.net/~kn6dv/ik2ded/ik2ded.html 73
to all de Giulio IK2DED.