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Author Topic: Tower height vs. surroundings  (Read 590 times)
VE4BLB
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Posts: 31




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« on: January 23, 2009, 08:01:40 AM »

I am contemplating a backyard 48 foot tower with a 3 element SteppIR. I am concerned that I have 3 story appartment buildings on the East and North sides of my property. They are about 100 feet away from the proposed tower location. I am guessint their height at 40 feet to their roofs. Will this affect the performance of the beam? Is the SteppIR a good choice?
73 de me BLB
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73 de me BLB
WW5AA
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Posts: 2086




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« Reply #1 on: January 23, 2009, 08:08:06 AM »

I am located at -51 HAAT with all rising ground at 100' or less, not good but my modified A3S beam works well at 35' considering. The StepIR is a great beam...I would go ahead with your project, it will be a lot better DX wise than a wire at the same height. Have fun.

73 de Lindy
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KB9CRY
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« Reply #2 on: January 23, 2009, 08:20:25 AM »

No

Yes
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WB2WIK
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« Reply #3 on: January 23, 2009, 08:22:56 AM »

If it's possible, I'd make the tower a bit higher.

The buildings probably won't do any harm but if they're only 100' away and fairly "close" to your antenna height, the chances for RFI (you interfering with them, and also possibly them interfering with you!) are greatly increased compared with having the antenna higher, which moves it farther away from them.

Also on 20m the SteppIR will "sing" at 65 feet, better than it will at 48 feet.  

WB2WIK/6
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N3OX
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« Reply #4 on: January 23, 2009, 08:26:56 AM »

I agree with Steve, if you can go higher, do.

If you can't, it's still worth doing.

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73,
Dan
http://www.n3ox.net

Monkey/silicon cyborg, beeping at rocks since 1995.
VE4BLB
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« Reply #5 on: January 23, 2009, 08:32:25 AM »

Local politics are such that 48 feet is max unless many variances are applied for and approved. Therefore, I feel commited to the 48.
73 de me BLB
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73 de me BLB
KB9CRY
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« Reply #6 on: January 23, 2009, 01:14:01 PM »

Local politics are such that 48 feet is max unless many variances are applied for and approved.


What exactly is the local ordinance state?  Is it max tower height is 48 foot?

If so, then you can put in a long mast (properly engineered) and get the antenna up higher that way.  

Usually the restrictions are on the height of the tower and not the antenna.
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