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 Post subject: Long wire antenna
PostPosted: Sep Thu 05, 2019 6:35 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Omak,wa,usa
Hello guys,
Well I have some questions about running a long wire first all one my ideas is run a long wire parallel with back of my house just under my over hang of my roof but bad thing is the local power poles run Parallel to but they are like 50 feet away .

The other way I thought was to run it from the back left corner farthest from the back door to the corner of my carport .
shown in the next picture but the first way would be less noticeable and not in the way

Sincerely rich


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 Post subject: Re: Long wire antenna
PostPosted: Sep Thu 05, 2019 7:48 am 
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Joined: May Tue 30, 2006 4:46 pm
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Location: Santa Rosa, CA
General guidance would be:

--Perpendicular to power lines
--As far as possible from power lines
--Not in a place where a falling power line could land on the antenna

Rich


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 Post subject: Re: Long wire antenna
PostPosted: Sep Thu 05, 2019 8:23 am 
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Location: Tucson, Arizona U.S.A.
Or where a falling antenna could land on a power line.

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 Post subject: Re: Long wire antenna
PostPosted: Sep Thu 05, 2019 2:35 pm 
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Location: Roanoke, VA
Rich, W3HWJ wrote:
General guidance would be: ...

I would add, preferably at least 1/4 wave at the lowest frequency that you want to receive. It isn't a long wire if it isn't long.

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 Post subject: Re: Long wire antenna
PostPosted: Sep Thu 05, 2019 3:18 pm 
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Location: Omak,wa,usa
Hello Dale,
Well the distance from my back of my house to my carport is about 50 feet


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 Post subject: Re: Long wire antenna
PostPosted: Sep Thu 05, 2019 4:24 pm 
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Joined: Oct Thu 04, 2018 2:11 pm
Posts: 253
Location: Suburban Chicago
I think that was a fairly common length back in the day. A quarter wave at the low end of the AM band is un-attainable for most of us.


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 Post subject: Re: Long wire antenna
PostPosted: Sep Thu 05, 2019 7:02 pm 
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Location: SoCal, 91387
khutch wrote:
A quarter wave at the low end of the AM band is un-attainable for most of us.

You got that right. For the low end of the BCB, 540 Kc, the antenna at 1/4 wavelength would have to be 455 feet.
http://www.onlineconversion.com/frequen ... length.htm

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 Post subject: Re: Long wire antenna
PostPosted: Sep Thu 05, 2019 10:30 pm 
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Joined: Jan Sat 12, 2008 12:25 am
Posts: 172
Location: Kingwood, Texas
A true long-wire antenna needs to be multiples of one wavelength and will exhibit gain at the operating frequency. Anything less is actually a random length antenna. But most people have come to use the term pretty much interchangeably.

Darrell


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