DAVIS Wireless Repeaters for VP2 Manual de usuario descargar pdf (Pagina 10)

25 - 10 Rev A 7/28/06

The following table covers the shorter ranges where a standard repeater should be sufficient.

Standard Minimum Repeater Requirement Table

(Use Yagi antennas on all Long Range Repeaters)

Total

Transmission

Distance

Line of Sight with

Little or No

Interference

(Outdoors)

Minor RF

Interference or

Minor

Obstructions

Into a Building or

All Outdoors with

High RF

Interference

Into a Building

with Minor RF

Interference

<300’ (90 m) None Needed None Needed None Needed None Needed

300’ to 400’

(90 m to 120 m)

None Needed None Needed None Needed 1 Standard

400’ to 600’

(120 m to 180 m)

None Needed None Needed 1 Standard 1 Standard

600’ to 800’

(180 m - 240 m)

None Needed None Needed 1 Standard 2 Standard

800’ to 900’

(240 m to 270 m)

None Needed 1 Standard 2 Standard 2 Standard

Note:

• Any solid obstructions have to be overcome by going over or around them. In this case,

you will need to include that in your transmission distance figures.

• If either your multiple weather stations or multiple receivers are spread far enough apart

to require the use of multiple chains:

o You will need to apply the distance figures in the above table for each chain, and

then add the requirements for each chain together to get the total number of

repeaters required.

o If the total distance to be covered exceeds 3000’ (920 m), it may be less

expensive to use Long Range Repeaters. Use the appropriate table to

determine the optimum layout.

If your distance needs are greater than those covered in the table above, you may need a Long

Range repeater.

Long Range Repeaters

The Long Range Repeater is very similar to the Standard Repeater. The only difference is that

instead of a single dipole antenna, there are two antenna connectors (one for transmit, one for

receive). This allows the connection of higher performance (gain) antennas.

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