Radwin 2000+ SERIES User Manual - page 22

RADWIN

2000+

Series

User

Manual

Release

4.2.40

3

‐

3

Stage

2:

Physical

Survey

3. On

the

urban

map,

check

for

developed

areas

situated

between

the

two

installation

sites.

Pay

attention

to

these

areas

when

performing

the

physical

site

survey;

there

may

be

tall

buildings,

RF

towers,

or

transmitters,

which

could

cause

interference

to

the

link.

4. Check

the

area

between

the

two

sites

for

obstructions

such

as:

•

High

ground

 ‐ 

hills

or

mountains

•

Lakes

or

large

bodies

of

water.

Water

has

a

reflection

effect

on

RF

signals

like

a

building.

This

type

of

reflection

causes

the

received

amplitude

to

be

reduced.

As

a

rule

of

thumb,

the

presence

of

a

large

body

of

water

between

the

link

sites

may

double

the

required

antenna

height.

5. Determine

and

record

the

compass

bearings

between

both

radio

units,

relative

to

north.

6. If

there

are

obstructions

between

the

two

sites,

calculate

the

Fresnel

Zone

(see

Link

Budget

Calculator

for

details).

7. If

the

site

chosen

does

not

meet

requirements,

consider

alternative

sites.

8. Use

the

Link

Budget

Calculator

(on

the

CD

supplied

with

the

equipment

or

using

the

RADWIN

Manager)

to

determine

the

expected

performance.

3.5

Stage

2:

Physical

Survey

During

this

stage,

you

review

the

environment

of

the

proposed

installation

location,

to

ensure

that

the

link

sites

are

suitable

for

the

wireless

network.

The

results

of

the

physical

site

survey

should

be

recorded.

To

perform

a

physical

survey:

1.

From

the

compass

readings

taken

in

the

preliminary

survey,

find

the

azimuth

(hori

‐

zontal

position)

that

the

first

ODU

should

face

towards

the

second

ODU.

2. Using

binoculars,

locate

any

obstructions

such

as

tall

trees,

high

buildings,

hills

or

mountains.

Look

for

other

RF

towers

between

the

two

sites.

Mark

the

locations

of

the

obstructions

on

the

map.

3. Determine

the

location

for

the

ODU

(having

regard

for

existing

rooftop

installations

and

tower

space).

It

should

be

above

any

obstructions,

considering

the

Fresnel

zone

(see

Link

Budget

Calculator

).

4. If

you

need

to

install

the

radio’s

antenna

on

a

tower,

make

sure

that

the

tower

is

far

away

from

overhead

electric

power

lines.

When

we

mention

“ODU”,

we

mean

an

outdoor

radio

unit,

or

its

antenna.

If

you

are

working

with

the

RADWIN

2000i,

which

is

an

indoor

unit

and

requires

an

external

antenna,

replace

the

term

“ODU”

with

“the

radio

unit’s

antenna”.