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Equis
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Bad signal high, good signal lower

Sun Aug 26, 2007 1:51 pm

Hello

I have made a simple 5ghz link over 15kms, very clean LOS

One end is on a tower, the other is on a steel shed on a hill on a 3 meter pole.

I got bad signal -88 at 3 meters on the pole, after messing aroung for ever we found at 1 meter on the pole got -75 :shock:

How can lowering a grid 2 meters on a pole make it so much better?

Thanks

:-)
 
bushy
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Re: Bad signal high, good signal lower

Sun Aug 26, 2007 5:36 pm

Reflections from the steel shed probably , when you lowered it you found a "dead zone"
 
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Equis
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Re: Bad signal high, good signal lower

Mon Aug 27, 2007 2:23 am

Thanks

I posted on another forum and they said the same, they also said it could be bouncing of the ground.

This is something I never knew existed!

Thanks :-)
 
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GWISA
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Re: Bad signal high, good signal lower

Mon Aug 27, 2007 10:33 am

Hello

How can lowering a grid 2 meters on a pole make it so much better?

Thanks

:-)
You should also familiarise yourself with something called the Fresnel Zone... combine tis with reflections, and you are destined for interesting times!
http://en.wikipedia.org/wiki/Fresnel_zone
 
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Equis
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Re: Bad signal high, good signal lower

Mon Aug 27, 2007 12:05 pm

My head started to hurt before I even clicked the link

I'm not as bright as some :shock:

I'll do some reading

Thanks :)

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