Topband: Quarter wave sloper on crank up tower ?

[john at kk9a.com]

Since the tower is a radiator with a half sloper, probably connecting the
end 40m elements to the boom would be good.  This should be easy to model.
I am not sure of a way to bond the tower sections but perhaps the connection
is fine the way it is.  

An easy option would be vertical dipole with the ends pulled out into a C
shape.  The downside is you may not like the lower wire running across your
backyard unless it could be along the privacy fence.

John KK9A



VE7RF wrote:

Has anybody used a 1/4 wave sloper (for 160m, aprx 120-130')  hanging from
the top of a 89' crank up tower before ?
Due to the 5 x sections overlapping, the feed point would have to be at the
very top of the  tower.  IE:  it can't be part way down from the top.

Will it work with some top loading, like a 3 el  40m yagi ?   Right now, my
modified F12 340N  yagi has all 3 x els  insulated from the boom. ( oem LL
wire loading replaced with hb  3/8" tubing coils).    I was seriously
thinking of bonding the REF and  DIR to the boom, to increase  the top
loading. REF is aprx 59' long.  DIR is aprx 52' long.

I  can't shunt feed the tower, since grnd mounted radials are out of the
question.   House is blocking the path of any radials  >  180 degs.

Jim   VE7RF