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

[Tower (K8RI)]

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 at 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