[TowerTalk] Sorry to bring up an oldie - Mast Material
Rick Scott
w7psk at yahoo.com
Thu Mar 10 08:22:27 PST 2011
Ive looked at the program and Ive used it, Im just answering questions on the
Reflector and trying to come
up with Best Material to be up there and best price.
I originally said it would be 2 to 3 feet above. the MAST would extend 4 feet
above
Here is the original
> element beam and nothing else will go on the mast. I would
> like to get 8ft as that will give me 4ft above the tower, I can
> put the antenna
> at 2 - 3 feet and be ok.
Sorry you want to give up, I didnt think it would cause such a headache for you.
Oh well Enjoy
----- Original Message ----
> From: Dave Hachadorian <k6ll at arrl.net>
> To: Rick Scott <w7psk at yahoo.com>; Towertalk reflector
><towertalk at contesting.com>
> Sent: Thu, March 10, 2011 7:45:28 AM
> Subject: Re: [TowerTalk] Sorry to bring up an oldie - Mast Material
>
> The antenna is going to be 2' above the bearing? I thought you said 4'
>yesterday. That changes everything. I guess you didn't follow my inputs to the
>mast calculator.
>
> I give up.
>
> Dave Hachadorian, K6LL
> Yuma, AZ
>
>
>
>
> -----Original Message----- From: Rick Scott
> Sent: Thursday, March 10, 2011 8:24 AM
> To: K8RI on TT ; towertalk at contesting.com
> Subject: Re: [TowerTalk] Sorry to bring up an oldie - Mast Material
>
> PS
> Im planning on getting 7 or 8 ft of material. 4ft for inside the tower and 3
>-
> 4 ft above it.
>
> I plan on mounting the Beam 2 - 3 Ft above the top. I have a Mast Bearing in
> the
> top of the tower also.
>
>
>
>
> ----- Original Message ----
> > From: K8RI on TT <k8ri-on-towertalk at tm.net>
> > To: towertalk at contesting.com
> > Sent: Wed, March 9, 2011 10:29:12 PM
> > Subject: Re: [TowerTalk] Sorry to bring up an oldie - Mast Material
> >
> > On 3/9/2011 4:24 PM, K7LXC at aol.com wrote:
> > >
> > > In a message dated 3/9/2011 12:01:25 P.M. Pacific Standard > Time,
> > > towertalk-request at contesting.com writes:
> >
> >
> > As Steve says, the tripod mount is likely the weak point and not the
> > current mast.
> > I purchase 6061-T6 in 24' lengths with 1/8", 3/16" and 1/4 wall. No, I
> > would not recommend a 24 footer be used in your tripod. I'm looking for
> > some stronger alloy and temper.
> >
> > As for your system I'd not go more than a few feet above the tripod,
> > unless the roof is reinforced under the tripod and the tripod is bolted
> > to/through the reinforcing and not just into the rafters.
> >
> > Wind is strange as to what survives and what fails.
> > I used to install TV antennas as a sideline back in the 60's and early
>70's.
> > At home I had a 5L 20 meter KLM on a 40' tower, a 6L 15 Meter KLM on a
> > 40' tower and a 7L 10 Meter Wilson (39' boom) on a 40' tower. These were
> > relatively light steel towers on dirt bases and 3 way guyed just below
> > the top of the tower. Yes I needed larger towers but that is what I had
> > at the time.
> >
> > I installed a new, fairly large TV antenna just above the top of a roof
> > mounted tripod. This tripod had two lag bolts in each leg that ran
> > nearly through the respective rafter in pre drilled holes so they
> > wouldn't split the rafters. Just a day or two after installing the TV
> > antenna (remember I did a lot of these) we had a rather strong
> > thunderstorm. It literally split the rafters pulling the bolts out and
> > took the tripod right off the roof, destroying the antenna in the
> > process. Yet the wind did no damage to any of the big antennas on the
> > 40' towers.
> >
> > Just because a lightly built system survives a big storm, does not mean
> > that system will normally, or can normally be expected to survive
> > another storm of the same intensity. Nature is fickle!
> >
> > 73
> >
> > Roger (K8RI)
> >
> > >> Im really confused. Id like to buy Local, because the >> mail order
> > > houses have
> > > Really high prices and high shipping
> > > plus they only do 5 or 10ft intervals.
> > >
> > >> I have a Glen Martin 9ft roof mount tower. Its just shy >> of 4ft
>from
> > > the rotor
> > > to the top of the tower. Right now I have
> > > a 2 1/2" Fence Post mast (really heavy wall) that I hold an > A4S up
>with.
> > >
> > >> A4 is going bad so I decided to get my dream antenna the >> standard
> > > SteppIR 3
> > > element beam and nothing else will go on the mast. I would
> > > like to get 8ft as that will give me 4ft above the tower, I > can put
>the
> > > antenna
> > > at 2 - 3 feet and be ok.
> > >
> > > Hiya, Scotty --
> > >
> > >
> > > The 3L SteppIR isn't appreciably bigger than the A-4 > you're
>currently
> > > using. Go ahead and use what you've got.
> > >
> > > If you want to go a little higher, use 1.5" galvanized > pipe
>(that's
> > > the ID measurement - the OD is 1.9"). The SteppIR U-clamps > are very
>snug
> > for
> > > a 2" mast so they'll work FB on a 1.9" piece of steel.
> > >
> > > The main factor is that it's going on a roof-mounted > tower. The
> tower
> > > will likely blow off the roof before the mast (whatever it > is) bends.
> > >
> > > Cheers,
> > > Steve K7LXC
> > > TOWER TECH
> > > and
> > > _www.championradio.com_ (http://www.championradio.com)
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > >
> > >
> > >
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> > >
> >
> >
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