[TowerTalk] K9AY performance expectations/help

[Scott McClements]

Hi All,

I just made 8 turns through two 2.4" #31 cores with the coax (RG8X).
at the feedpoint  I have some #31 split beads I will clamp onto the
control cable (when it stops raining!).  The coax is a 150 foot run
through underground conduit. It goes through a single point ground
where it comes out of the ground and up into the shack. The control
lines and coax run through ICE surge protectors.   So hopefully I only
have to deal with things on the antenna side.

-Scott, WU2X

On Sat, Aug 29, 2009 at 2:04 PM, Craig D. Smith<craig at powersmith.net> wrote:
> Doug ...
>
> I was going to suggest the same thing as Pete - common mode isolation.
>
> I have a homebrew K9AY about 2/3 normal size due to space constraints here.
> It is actually disguised inside an ornamental plum tree.  But it works fine,
> with 15 to 20 db F/B from BCB thru 40 meters.  And is actually often a
> better RX antenna on 30, 20 and 17 than my xmit vertical.  They are close
> together (60 ft or so) and I'm sure there is some interaction, but not
> enough to bother me.  I also have 8 short 8 ft radials under it in addition
> to the single 4 ft ground rod.
>
> I have both the coax and the control cable choked at the relay box at the
> antenna and also 40 ft away just before they come into the house.  I'm using
> several turns on type 31 ferrite.  If you can find/buy some clamp-on cores
> in an appropriate material you can easily give this a try without any major
> surgery on your setup.
>
> 73
>         ... Craig  AC0DS
>
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