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Author Topic: Hidden antenna options ?  (Read 38338 times)
WB6BYU
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Posts: 13334




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« Reply #45 on: February 15, 2013, 01:00:05 PM »

I'll wait until we get moved in and I see how much of a problem I have
to deal with.  If they get into the vegetable bed then it will be more of
an issue even if they leave the coax alone.  At this point it doesn't appear
that they are getting on our roof, and I'd like to keep it that way.

The first thing I'm going to try surrounding the coax with is the house
itself:  putting the feedpoint inside the attic and just bringing the wires
out through a vent screen, then tucking them under the shingles or under
the eaves where they are out of reach.

Playing recorded hawk cries through a small speaker mounted on the roof
may also encourage them to seek shelter elsewhere.

Next step would probably something that smells or tastes bad:  chilli
pepper oil mixed with roofing tar perhaps.  We might add some large cat
"scent" (some zoos collect it from their tigers and lions and sell it as
a deer repellent) to further discourage them.

If it becomes necessary I might resort to running a second wire charged
to 150VDC / 1uF or so in parallel with the antenna wire, arranged so they are
likely making contact with the former when chewing on the latter.  It certainly
was effective for the tom cat that used to visit us for meals without an
invitation.  Not enough to do damage, but sufficient to discourage repeat
visits.
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W6UV
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Posts: 538




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« Reply #46 on: February 15, 2013, 03:10:16 PM »

But the neighbor feeds the local squirrels on top of the fence, so I'm considering ways to discourage them.

A pellet gun will discourage them permanently.
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VE3FMC
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Posts: 987


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« Reply #47 on: February 16, 2013, 06:29:16 AM »

I must have coax friendly squirrels around here.  Grin I have had a run of coax across the roof of my house for the past 5 years. No problems with the little rodents chewing on it. I have 3 runs of coax, plus a rotor cable running along the wood fence in my back yard and it has not been chewed.

I have a pair of squirrels that live in a tree in my front yard. In the spring I am going to make them relocate! I think I can reach their living quarters, if so it is going to be destroyed. They can move some where else.

Although they are entertaining to watch as they run around the trees in my back yard. Caught them doing the nasty one morning on the one maple tree out back.  Grin It was funny because they are grey and a black squirrel tried to get in on the action and was chased up the tree.

Hey maybe I should leave these ones alone, they have not chomped the coax runs. If I boot them out and new ones move in they might have a taste for coax and wire.
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K0JEG
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Posts: 669




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« Reply #48 on: February 18, 2013, 05:45:13 PM »

I've heard that painting coax fluorescent green will keep them away from cables, because they don't chew green wood. The problem with just about any chemical solution is that it will either wash off or require the varmint to break the jacket, depending on how it's done. If it washes off you'll need to keep on it, if they chew through the jacket you end up replacing anyway. And capsaicin flooded coax won't be easy to find anyway.

I'd say running it in schedule 40 conduit might help a little. As long as you keep the ends covered it might be a little harder for them to get started chewing, and they might not realize they can try.

And are you sure the neighbors are feeding the squirrels? They might be trying to feed birds.
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N1ZHE
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Posts: 68




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« Reply #49 on: February 19, 2013, 04:01:24 AM »

Back to the drawing board...  

A full 20meter loop was installed around the perimeter of my back yard fence, roughly 6 feet from the ground, a 4:1 ballon was used to bring the antenna in the house via RG8x coax. All was well until a chipmunk decided to have a
taste of the copper wire !!

A new chipmunk safe antenna design is required !

73
Demetre - VE3/SV1ENS

Not good! Try substituting barbed wire, lol!

David N1ZHE
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KH6DC
Member

Posts: 642




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« Reply #50 on: February 24, 2013, 08:45:26 PM »

But the neighbor feeds the local squirrels on top of the fence, so I'm considering ways to discourage them.

A pellet gun will discourage them permanently.

Or a 44 magnum  Grin
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73 and Aloha,
de Delwyn, KH6DC
K0JEG
Member

Posts: 669




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« Reply #51 on: February 25, 2013, 09:24:47 PM »

But the neighbor feeds the local squirrels on top of the fence, so I'm considering ways to discourage them.

A pellet gun will discourage them permanently.

Or a 44 magnum  Grin

At almost $0.70/round that's an expensive way to get rid of vermin. And you'd better be a fairly good shot, too.
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W1JKA
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Posts: 1763




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« Reply #52 on: February 26, 2013, 07:53:45 AM »

  Get rid of squirrels and chipmonks on the fence the easy way,just affix a copper penny on top of rail about every 3 ft.They don't like the smell of the chemical reaction between copper and wood resins,especially cedar or pine.Similar to the age old remedy of putting hair clippings from the barber shop around the perimeter of your garden to keep out deer or other pesty animals.
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WB3HUS
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Posts: 5




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« Reply #53 on: March 27, 2013, 06:38:38 PM »

Hi all,
I have the same problem as all the other guys. I live in a trailer park and the owner is a problem. she thinks since my trailer is on her land she can stop me from doing my hobby, Im going to string a 1/2 wave 80 mtr dipole on my roof with parts under the shingles with the holders that you would use for xmas lights. my trailer is ~65 to 70 feet long it has a peaked roof (wooden) now my question is: " can I bend the dipole straight down the center of the roof, then at the end bend it at ~90 degrees and the same at the other side to take up the other 60 some odd feet of antenna". will that affect my pattern, it will be about 12 + feet above the ground.

thanks
wb3hus
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WB6BYU
Member

Posts: 13334




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« Reply #54 on: March 28, 2013, 09:14:18 AM »

You can take a lot of liberties with dipoles and they will still work better
than the same amount of wire coiled up on the shelf, even if the pattern
and/or performance doesn't match the ones in the antenna books.

The best method I've found would be to put the feedpoint in the center
of the roof and run the wires down to opposite corners.  At that point
bend it around the corner along the short end of the trailer and continue
on around the perimeter as needed.  You'll a few more feet of wire than
the standard formula, and there may be some advantage to putting a
loading coil somewhere near the first corner to reduce the total length.
(Make it the same on each end - you can then adjust the coil to tune
the antenna rather than the wire lengths if that is more convenient.)

The SWR may be on the high side at resonance, as the feedpoint impedance
may be in the 20 to 30 ohm range.  But with the wires tucked under the
shingles it shouldn't be very noticeable, especially if you use thin wire that
matches the roof color.
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WD4ELG
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Posts: 875




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« Reply #55 on: March 28, 2013, 10:38:56 AM »

W1JKA, that is terrific guidance!  Thanks.

WB3HUS, that should work...especially since I see so many folks leaving their Christmas lights up all year long!

Mark Lunday, WD4ELG
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WB3HUS
Member

Posts: 5




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« Reply #56 on: March 28, 2013, 03:04:40 PM »

thanks guys,
I will give it a try that is what I was thinking of doing. You say that to try to get the middle of the dipole in the center of the roof. and run it to the end of the roof and bend it at approx. 90 degrees on each end. Can this be done with a multiband dipole for 80 and 40 and maybe 20mtrs. also can this be done with one that I purchased  if I do so.you can answer this at my email address: rb622b@aol.com this way we wont take up space on this post.

Thanks
rich(wb3hus)
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WB6BYU
Member

Posts: 13334




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« Reply #57 on: March 29, 2013, 09:32:58 AM »

Yes.
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