[TowerTalk] Question on multiple slopers on a tower

[K8RI on TT]

On 7/2/2011 4:08 PM, Ray Benny wrote:
> Not sure if this is the proper reflector to ask about slopers. But here
> goes.
>
> I have a 70ft tower with a single 80m sloper on it. I move the end if it
> around to point in the direction I want to work in the world. It works
> great!

I run multiple slopers on 75 and 40 mounted on just slightly less than 
100' 45 G that also was supporting a TH5 at 100', a  7L C3i 6-meter Yagi 
at 115 and a cross boom with a pair of 11L 440s and a pair of 12L 144s.
The configuration has varied over the years,  from 3 on each band down 
to the current minimum of one on 40 and one on 75, but I have used 
something similar to the array shown in the past few issues of the ARRL 
Handbook.  There is an RF choke wound on 5, 2.4" ferrite cores where the 
coax reaches the tower. The performance(directivity and f/b) seems to 
vary with conditions, but it has worked well so far.   I'd see it as 
worth a try.  They are simple and inexpensive antennas.

73 and good luck,

Roger (K8RI)


> I am re-doing the yagis on this tower and have thought about adding other
> 80m slopers in different directions thru a remote coax switch. My question,
> to get full directional coverage, do I need 4 slopers 90 degrees apart, or
> are slopers broad enough that I can use three? If they radiate in about 60
> degree beam width, I would need four, one each for ZL/VK, JA, EU, and SA
> which are about 90 degrees steps from each here in AZ.
>
> Any experience with multi slopers? Will they interact?
>
> Tnx,
>