For the same application at my QTH and tower I used Hoffman type 3R
enclosures ( http://www.hoffmanonline.com/iHelps/Product.cfm?ID=7028A ). These
things are commercial grade and made to withstand water spalching and driven
I used Unistrut channels and J-bolts to attach the box to the angle steel
of my tower base. I installed the Polyphasers inside the enclosure so they
protruded through to the outside. My switch is also inside this enclosure,
mounted onto the wall opposite the Poly's, connectors facing the front of the
box, not downward. I had to saw off a piece of the switch's mounting bracket
to do this, though. All coax cables enter this enclosure through a 3-inch PVC
conduit system (way too small - shoulda used 4-inch.)
One item I did not do yet was to install a multi-position barrier strip to
connect the switch to its control cable. My intention there is eventually to
install MOVs on the terminals for a bit of lightning protection on the control
cabling. inside the enclosure.
I ran one of the ground wires (#2 solid copper) from my tower's leg inside
the box to a ground terminal lug on the steel itself. So everything inside can
be grounded to the tower, to the earth rods, etc.
Final touch: a padlock on the outside.
Gene Smar AD3F
-------------- Original message ----------------------
From: "Butch" <firstname.lastname@example.org>
> Hi all,
> I am about to erect a 50' Rohn 25 tower in my back yard. Atop the tower will
> be a small tri-bander, a 6-meter yagi and at the very top, a 10-meter
> vertical for local nets/chatting. Suspended from the tower, just below the
> tri-bander will be my 75-meter dipole. So, I will have 4 runs of coax
> descending the tower to the remote switch and one run from the switch into
> the shack.
> I am planning to install A Polyphaser on each run, above the switch and
> mounted in an enclosure of some type. Any suggestions as to type of
> enclosure works well over time? Sealed? Ventilated? Plastic?
> Metal?........you get the idea. Thanks.
> Butch K4NAU
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