Re: [TowerTalk] Slopers, half slopers, (using the tower)

["Tower (K8RI)" <tower@rogerhalstead.com>]

Doug Renwick wrote:

> Roger,
A while back I had two half wave slopers on 75. One to the NE and one to 
the SW. There was about 2 S-units difference between stations in line 
when switching one to the other.  I still have to one oriented on 
Europe, but the weight of all that coax puts a substantial sag at the 
feed point.  The half sloper without that coax is also a lot less visible.

Both the half wave on 75, or the half sloper on 160 are maybe a tad 
steeper than 45 degrees.

> I use two half slopers on 160M with the feed point at 100 ft and under a
> number of yagis.  One slopes east and the other west and I do have gain
> in the direction of the slope. More than two half slopers showed no
> benefit here but you may have different results.
My biggest problem will be orienting the antennas. I might be able run 
the half slopers on 160 East and West while keeping the half wave center 
fed slopers on 75 to the NE and NW.  Then I could still stick one for 40 
to the South.  Of course I'd rather have 40 through 10 in a big yagi up 
there.<:-)) which I don't think is going to happen.

I'm currently reorganizing the cables on the tower to get them inside 
and a whole lot neater.  I still have to let the big mast down so I can 
repair the 6-meter antenna.  Like last winter, I'll probably not get it 
all done.

73

Roger

> Doug
>
> kk9a@arrl.net wrote:
>
> > Since the tower is part of the 1/2 sloper antenna system, the 
> > radiation is
> > more omni directional than a full sloper.  It's radiation pattern is 
> > similar
> > to an inverted "L".  I'm not sure if you can gain much by having 1/2 
> > slopers
> > in different directions.
> >
> > John
> >
> >
> > ----- Original Message -----
>
>
> > Any one have experience with "half slopers"? (half of a half wave with
> > the tower serving as the other side)
> >
> > Yesterday I installed a half sloper for 160 and am quite pleased with
> > the results.  The feed point is roughly 96 feet and the angle is close
> > to 45 degrees on the South side of the tower.
> >
> > According to the "Antenna Handbook" there is some gain away from the
> > tower through the antenna.    I'm thinking of installing two more. One
> > to the NE and one to the NW.
>
>
> > Any thoughts or suggestions?
> >
> > Roger (K8RI)

--
Roger Halstead (K8RI ARRL Life Member)
Worlds Oldest Debonair (N833R S# CD-2)
www.rogerhalstead.com


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