DAVIS Wireless Repeaters for VP2 Manual de usuario descargar pdf (Pagina 13)

Rev A 7/28/06 25 - 13

You may need to use high-gain Omni antennas at one end of your transmission chain(s):

• If your weather stations are spread far enough apart to fall outside 25° either side of the

transmission path centerline or

• If your receivers are spread far enough apart to fall outside 25° either side of the

transmission path centerline

You may need to employ high-gain Omni antennas in the middle of the chain:

• A station branching off of a main chain may require the use of a high-gain Omni antenna

if it branches off at greater angle than the transmission cone of a Yagi antenna AND the

station is not near the Yagi antenna. Yagi antennas can receive transmissions behind or

to their side when close to the antennas (<200’ (60 m) line of sight)

• Two stations branching off a main chain will always require the use of a high-gain Omni

at that point.

Since placing high-gain Omni antennas in the middle of chains complicates your network

distance capabilities, it is best to use the distance table in the “Planning Where to Place

Repeaters” section. You may still use one of the “Omni” Tables to determine the requirements

for the branching chain since the high-gain Omni will reside at the end of the branching chain.

General Notes on the use of Long Range Repeaters:

• Remember that Standard Repeaters use dipole antennas which are omni-directional, so

they will transmit and receive in all directions just like the high-gain Omni antennas.

• You cannot exceed a total of eight repeaters in a chain regardless of repeater type.

• If RF interference levels are higher than anticipated, you may need to use more

repeaters than indicated.

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DAVIS Wireless Repeaters for VP2 Manual de usuario Pagina 13