Re: [FT897] Re: What can I do with an 80 foot TV tower?
- Can build a small ham shack at the tower site.
>[Non-text portions of this message have been removed]
> --- In FT897@yahoogroups.com <mailto:FT897%40yahoogroups.com>,
> "Blaine" <igoguy@...> wrote:
> > Happy New Year everyone!
> > I'm new at this, so I have lots of questions. Years ago my dad built
> a guyed 80-foot steel pipe "tower" for our television antenna on the
> ranch. I think he found the plans in Popular Mechanics, and the tower
> is balanced and pivots about 20 feet up so that you can bring the top
> to ground level to work on the antenna (but it's kind of a scary
> process). Interestingly enough, we discovered years later you could
> get the same television stations leaning an antenna against the barbed
> wire fence next to the tower.
> > My question is this: Can I use this tower as an antenna or antenna
> base for my FT-897D? It's about 100 yards from the ranch house where
> the radio will be located. Guy wires (total of four, two heights,
> opposing) are galvanized steel coming off the tower at about 45 degree
> angles, and connected with turnbuckles to steel rods buried in the
> ground with concrete around them.
> > If this is just a pipe dream, let me know. But if this thing is
> actually useful, I'd really like to hear your ideas about making the
> most of this point on the aeronautical maps. Detailed descriptions of
> how I might use it and the materials I'd need would be really helpful.
> > And if I can use the barbed wire fence, I'd like to get your
> feedback on that too. Lord knows, there are a lot of them around here!
> > -Blaine
- Peter I would disagree with the comment "you cannot use the mast itself, as
an antenna, without an insulator at the base!". You can shunt feed the mast
without it being insulated from the ground. I have a friend with a 125' non
insulated tower that is shunt fed and he uses it for 160M with no problems.
And If you are running on HF you will not have enough loss to worry about
for the distance to tower. The feed point of my dipoles are over 150' from
my house and they work great. I am feeding them with RG-11 and loss is
minimal on HF.
Just throwing in my 2 cents here.
From: "Peter Grant" <ei4hxperimental@...>
Sent: Saturday, January 02, 2010 7:18 AM
Subject: Re: [FT897] Re: What can I do with an 80 foot TV tower?
> Hello Blaine, and a Happy New Year to all.
> As mentioned in previous post, you cannot use the
> mast itself, as an antenna, without an insulator at the base !
> You can certainly use the mast to support the top end of a *sloper* wire
> There are lots of examples of *long wire* slopers, even ones with *traps*
> for the various bands,,, fed from your shack, at the low end, and with an
> insulator at top and ground side, you can feed this with a short run of
> co-ax from the shack to the base of your *sloper*
> If you ant to attach any beam to the top of the tower, you will need a
> rotator, at the top, and a long length of control cable, as well as the RF
> As said before you will have massive losses with co-ax so twin feeder
> would be less loss, but to take it to the top of the tower at that
> distance, would require a non metallic guy rope to support the feeder at
> the diagonal,,, this will be a minimum of 330 feet. or along the ground
> and up th mast, would be just less than 400 feet. Not forgetting that if
> using twin feeder you would need to stand it off from the metal mast.
> Look for examples of *sloper* antenna, in the ARRL Antenna book, or google
> * multiband sloper antenna* and see if anything might suit your location.
> 73 from Ireland
> Peter EI4HX ei4hxperimental@...
>> I'm new at this, so I have lots of questions. Years ago my dad built a
>> guyed 80-foot steel pipe "tower"
>> My question is this: " Can I use this tower as an antenna " ?
> [Non-text portions of this message have been removed]
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