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Author Topic: Need advice fitting antenna into side yard  (Read 2525 times)
KF5MMY
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« on: January 06, 2012, 02:23:19 PM »

Along side of my house, I have 16 feet of gravel to the property line wall, and the house is about 50 feet in length. I was thinking inverted V dipole with open feed. Maybe a Spiderbeam HD 12m fiberglass pole, and two 35 feet legs of #18 wire, fed with 450 ohm poly clad window line. If I collapse the pole to about 34 feet I can attach the dipole ends to the house at about 9 feet off the ground, and I should get 90 degrees at the feed between the two legs. Or I could go higher if less than 90 degrees at the top is OK.

Will this work with my MFJ-941D tuner for 80 meters through 10 meters?

Do you think using fishing line as guy wires like the Spiderbeam folks say will allow this pole to stay up 34 feet with the winds I get here?

My end fed wire running up to the tree in the backyard came down in the reported 60+ mile per hour winds we had about a month ago. The 3/32" Dacron rope (260 pounds breaking strength) broke in the middle between the brick and the end insulator (it was running over a branch).

Jim
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WX7G
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« Reply #1 on: January 06, 2012, 02:32:00 PM »

This will work well and I've used a similar antenna many times.
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KF5MMY
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« Reply #2 on: January 06, 2012, 04:51:09 PM »

Thanks! My wife wants my existing end fed antenna moved out of the back yard, where it goes over the swimming pool. It doesn't work all that well since it is 12 feet high at the chimney going up to 25 feet high at the tree. And it causes the house alarm system panel to "beep" when I transmit on 30 meters. I'm hopeful that moving all of the antenna above the house will help.
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WX7G
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« Reply #3 on: January 08, 2012, 06:43:50 AM »

It is a bit short for 80 meters and although the tuner may tune it the tuner losses can be high. Fortunately you can connect the two open wire feeders together and connect them to the tuner "random wire" post or the UHF antenna connector. Run a wire out the window to a ground rod and if you can fit them, some radials. It will work well on 80 meters and with an additional homebrewed loading coil in series at the tuner, 160 meters.

My favorite mast for this sort of antenna is made of 2 x 2 lumber. The cheap stuff in 8' lengths works. With a couple coats of house paint it will look good for years. For your 25' unsupported length you might want to use 2 x 3 lumber. I build it like so with 6" lengths of the lumber stacked up between the long pieces to make a ladder-like structure. Built like this the width at the base is 7 X the width of a 2 X 3, with is 7 X 1-5/8 or about 11".

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« Last Edit: January 08, 2012, 06:49:48 AM by WX7G » Logged
WA4IIF
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« Reply #4 on: January 18, 2012, 05:08:18 PM »

How about using one of the UltraLite antennas by K1JEK and bending the ends to fit your yard? For bending info, see http://www.comportco.com/~w5alt/antennas/notes/ant-notes.php?pg=16.  For UltraLite antenna info, see http://www.k1jek.com/. I use the UltraLite Sr. in an inverted V configuration with a bend of about 14 feet from each end to fit the antenna into my yard.

73, Chuck
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