Test / measure free line of sight in city ?

"FCM Wiesmans" <fcmwiesmans@gmail.com> wrote in message
news:1162247576.396889.242890@k70g2000cwa.googlegr oups.com...
>I want to make a connection between two buildings some 1.5 km apart in
> a city.
>
> There is no free line of sight.
>
> But maybe with two poles of 5 meter on each rooftop high it might work.
>
> But you can't climb in a pole - and spending time creating the whole
> network just to find out it has no connection is a waste.
>
> Is there a simple (electonic) test / trick to test if the top of the
> two poles can 'see' eachother?

A bright light source on one building, and a mirror on the other.
There are also toners that microwave radio installers use. Basically low
cost transmitter and receiver that gives a tone for received signal
strength.

>
>
> Thanks for any help.
>

I want to make a connection between two buildings some 1.5 km apart in
a city.

There is no free line of sight.

But maybe with two poles of 5 meter on each rooftop high it might work.

But you can't climb in a pole - and spending time creating the whole
network just to find out it has no connection is a waste.

Is there a simple (electonic) test / trick to test if the top of the
two poles can 'see' eachother?


Thanks for any help.

On 30 Oct 2006 14:32:56 -0800, "FCM Wiesmans" <fcmwiesmans@gmail.com>
wrote in <1162247576.396889.242890@k70g2000cwa.googlegroups .com>:

>I want to make a connection between two buildings some 1.5 km apart in
>a city.
>
>There is no free line of sight.
>
>But maybe with two poles of 5 meter on each rooftop high it might work.
>
>But you can't climb in a pole - and spending time creating the whole
>network just to find out it has no connection is a waste.
>
>Is there a simple (electonic) test / trick to test if the top of the
>two poles can 'see' eachother?

You need more than just line of sight -- you need a clear fresnel zone.
Check Wikipedia.

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