RTS TR-240 Spezifikationen PDF herunterladen (Seite 48)

Separation Distance and Antenna Gain

Interference is greatly reduced as the physical separation between

access points is increased. The separation distance required for

multiple access points to operate without interference from each

other is dependent upon the type of antennas used.

For BTR-240s operating on non-overlapping RF channels, Table

7-1 can be used as a guideline for separation distances to obtain

the optimal system performance for indoor applications.

NOTE: When overlapping RF channels are being used, farther

spacing will be required to obtain the same optimal

system performance.

Type of Environment

When BTR-240 base stations are operating indoors and through

walls, the interference will be greatly reduced and the separation

distances required to keep them from interfering will also be

reduced.

Indoor and outdoor environments behave very different because

of the amount of reflections that are present. In general, for

outdoor environments, every antenna gain increase (or decrease)

of 6dB will cause the coverage area to double (or half). For indoor

environments, every antenna gain increase (or decrease) of 9dB

will cause the coverage area to double (or half).

Guidelines for Deployment Optimization with

Multiple BTR-240s

•

When using omni-directional antennas, place the BTR-240

base station as close to the center of the coverage area as

possible.

•

When possible, always operate multiple BTR-240s on

different “non-overlapping” RF channels.

•

Maintain a minimal separation distance (Table 7-1) between

base stations, even when operating on “non-overlapping” RF

channels.

•

When possible, place multiple BTR-240s such that they do not

have direct LOS to each other.

•

Always try to ensure that wireless beltpacks are separated by at

least 3ft from each other.

7-6

Table 7-1

BTR-240 Spacing for Non-Overlapping RF Channels

Antenna Separation

Distance

3dBi (supplied) 70ft

7dBi 165ft

11dBi (pointed at each other) 400ft

11dBi (at 45° to each other) 70ft

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 85 86

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