[Antennas] Need good idea for chimney mount.

2003年10月13日 21:55:43 -0500

Well from here it looks like Firebrick has at least 2 choices, move in with
ole Jim down in CC Texas or maybe look around for one of those old missile
silo's up on Nebraska or the Dakota's.. both would seem pretty safe to me..
just hang that Spyder right up there.. good luck Firebrick.. mac/mc
----- Original Message -----
From: "Jim Isbell" <[email protected]>
To: "FireBrick" <[email protected]>; <[email protected]>
Sent: Monday, October 13, 2003 6:20 PM
Subject: Re: [Antennas] Need good idea for chimney mount.
> Aint nothing gonna freeze on this antenna.
>> We live on the shores of Corpus Christi Bay. I moved here when I
> retired because in Austin (250 miles north of here) it sometimes got
> down to freezing. That was too cold for me. Yes, it can happen, but in
> the five years I have lived here I have not seen it happen yet. I have
> Papaya, Banana, Grapefruit, Palms, Olive trees and Pineapple growing in
> my yard. The chimney is massive. It is the whole east wall of the den.
> If it breaks I will be in deep do-do as it is bonded to the floor which
> is 8" poured reinforced concrete. The floor is attached to the walls of
> the basement which are 10" thick poured reinforced concrete which are
> attached to the basement floor which is 8" thick reinforced concrete.
> The walls of the house are TWO layers thick brick (about 8 inches)
> with a wood frame wall 4" thick inside that. This house was built to be
> Atomic Bomb Proof from a direct hit on Corpus Christi 12 miles away
> (line of sight across the bay) back in 1965. It has steel shutters on
> the windows.
>> There is a damper (closed) and glass doors with fiber gasket (also
> closed) What ever warm air escapes, it isn't much.
>> Now back to the question...........anyone have any ideas on how to
> attach the antenna (a mere 5.5 KG) with a TV rotor on a mere 10 foot
> pole with no guys, to my above described base?
>> PS, I have seen TV antennas that would have more wind resistance than
> this spider beam. The greatest wind resistance will be from the 10 foot
> 1.5" galvanized pole and the TV rotor.
>> FireBrick wrote:
>> >I'm a retired licensed Chicago mason contractor.
> >
> >A lot depends on the use of the chimney.
> >(A Service Chimney is one that exhausts the hot gases of a furnace and or
> >water heater. It usually has a 8 or 10" round hard fired clay pipe
sticking
> >up out of the top of the chimney.)
> >(A Fireplace Chimney is for a wood or gaslog burning fireplace. It
usually
> >has a rectangular clay flue liner sticking up out of the top of the
chimney)
> >
> >A service chimney or fireplace is usually about ~21" square.
> >Both types of chimneys can be incorporated into a single unit, in which
it
> >is approx. 60" X 21" or more if the house requires even more fireplaces
or
> >furnaces.
> >
> >A single service chimney should not be used to support anything bigger
than
> >a TV antenna.
> >
> >I made money repairing me, trust me on this...
> >
> >
> >PS. A gas log fireplace will exhaust corrosive gases also. Just not in
the
> >same quantity as a gas burning furnace. If unused and even with the
damper
> >closed, warm air will still escape the chimney and could condense and
freeze
> >on a rotor that is above the flue.
> >
> >A wood burning fireplace will exhaust tar and soot that will coat
anything
> >above the flue with a greasy dark messy uncleanable creosote.
> >
> >I made money cleaning this, trust me on this...
> >
> >
> >----- Original Message -----
> >From: "Jim Isbell" <[email protected]>
> >To: <[email protected]>
> >Cc: <[email protected]>
> >Sent: Monday, October 13, 2003 5:41 PM
> >Subject: Re: [Antennas] Need good idea for chimney mount.
> >
> >
> >
> >
> >>Well, we dont use the fireplace. It doesn't get that cold here. So
> >>chimney gases are not a concern. As to the wind load, a 3 band spider
> >>beam weighs less than 20 lb. and can be turned by a standard TV antenna
> >>rotor so the wind load is negligible. The reason I went for a spider
> >>beam is because we have a hurricane or two here almost every year. The
> >>chimney is exceedingly strong and I think the pole would bend in the
> >>middle before anything on the chimney was even stressed.
> >>
> >>[email protected] wrote:
> >>
> >>
> >>
> >>>I strongly recommend against mounting anything on a chimney.
> >>>
> >>>1. Its not good for the chimeny to have any substantial wind moments on
> >>>
> >>>
> >it.
> >
> >
> >>>2. Ever notice what happens to metals subjected to the corrosive
action
> >>>
> >>>
> >of
> >
> >
> >>>chimney flue gasses after just a few months?...it will damage your
> >>>
> >>>
> >antenna's
> >
> >
> >>>support, feedline and the antenna itself.
> >>>
> >>>Bob
> >>>
> >>>
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