Re: 15 Miles shot. How to do it?

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PersComp
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join:2005-08-17
Cayce, SC

reply to anoclon
Re: 15 Miles shot. How to do it?

Not sure why, but base2 provides a better option despite being a slightly longer shot and basically the same terrain. It even looks like there is slightly more fresnel encroachment on #2. Perhaps someone may have some other insight.....

This is with the 2300 w/19 as Lutful suggests.
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Are these instructions or corrections???

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· 2006-09-08 21:06:31 ·

rawgerz
In Debt we trust
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join:2004-10-03
Grove City, PA

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said by PersComp

:

Perhaps someone may have some other insight.....

The ground at the lower part should be why it's low. It's cutting the fresnal smaller because of the height and distance.

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· 2006-09-08 21:19:57 ·

PersComp
Premium
join:2005-08-17
Cayce, SC

said by rawgerz

said by PersComp

:

Perhaps someone may have some other insight.....

The ground at the lower part should be why it's low. It's cutting the fresnal smaller because of the height and distance.

I thought that at first too, but the one with greater fade margin has less fresnel clearance. And the spot you speak of is the only spot that the fresnel has any encroachment. Just seemed weird to me. Must be one of those weird algorithmic fresnel issues that has to do with odd or even clearances or something.....

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Are these instructions or corrections???

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· 2006-09-08 21:29:12 ·

LLigetfa

join:2006-05-15
Fort Frances, ON

said by PersComp

:

Must be one of those weird algorithmic fresnel issues that has to do with odd or even clearances or something.....

Like when you stop at a red light and your FM radio fades... pull ahead a foot or two and it clears up. When I run the numbers in RM, I always move the elevation up and down a few metres to see if it is on a null point.

I have read stories of installers having to lower an antenna a few feet to improve the signal. Sometimes it is to get below noise but not always. I'd guess sometimes raising it a few feet would have had the same effect.

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· 2006-09-08 22:23:27 ·

PersComp
Premium
join:2005-08-17
Cayce, SC

Hence the math of 50% engineering + 50% networking + 50% black magic to create a sucessful WISP...

Or as Yogi Berra said, 90% of hitting is half mental...

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Are these instructions or corrections???

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· 2006-09-08 22:26:13 ·


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