Справочник Пользователя для Zoom Telephonics Inc WLANPCCRD11
ANTENNA OPTIONS and
INSTALLATION INSTRUCTIONS
ZoomAir Wireless Network Interface Cards are available with either an integrated antenna or an
external antenna. The 11Mbps ZoomAir, supporting both PCMCIA and PCI formats, and shipping
with the ZoomAir Hardware Access Point, comes with an external dipole antenna, providing more
uniform coverage and up to 30% greater range in specific settings. Additional antenna models are
available to meet specific wireless networking installation needs.
external antenna. The 11Mbps ZoomAir, supporting both PCMCIA and PCI formats, and shipping
with the ZoomAir Hardware Access Point, comes with an external dipole antenna, providing more
uniform coverage and up to 30% greater range in specific settings. Additional antenna models are
available to meet specific wireless networking installation needs.
MAXIMIZING RANGE
The built-in patch antenna on the PCMCIA and PCI Models has a horizontal pattern shaped like a cone. When
using two ZoomAir cards with the integrated patch antenna in an office environment where set-up is less than
10 ft. apart, you can minimize packet errors by placing the units on different planes. Once the units are further
than 10 ft. apart, the antenna signals will reflect off walls, tables, and people, thus changing signal
polarization. Outdoor polarization has an even greater effect. If there are not any objects in the path of the two
radio cards, the two cards should be on different planes to achieve the best range and to minimize packet
errors.
using two ZoomAir cards with the integrated patch antenna in an office environment where set-up is less than
10 ft. apart, you can minimize packet errors by placing the units on different planes. Once the units are further
than 10 ft. apart, the antenna signals will reflect off walls, tables, and people, thus changing signal
polarization. Outdoor polarization has an even greater effect. If there are not any objects in the path of the two
radio cards, the two cards should be on different planes to achieve the best range and to minimize packet
errors.
The external dipole antenna model has an omni pattern. It transmits and receives signals equally in all
directions. When using ZoomAir cards with external dipole antennas, it’s best to have them all oriented in the
same direction. If you have one card with a dipole antenna and another with an integrated antenna, we
recommend that the dipole be at 90° to the integrated patch.
directions. When using ZoomAir cards with external dipole antennas, it’s best to have them all oriented in the
same direction. If you have one card with a dipole antenna and another with an integrated antenna, we
recommend that the dipole be at 90° to the integrated patch.
With all cards, placement is very important. If one computer is under a desk, loss will occur. Glass and metal
will also cause degradation (e.g., inside a car). Weather conditions such as snow and rain water increase
signal attenuation. Essentially, different materials affect the propagation of radio waves: Some cause more
attenuation than others. See below for some common examples:
will also cause degradation (e.g., inside a car). Weather conditions such as snow and rain water increase
signal attenuation. Essentially, different materials affect the propagation of radio waves: Some cause more
attenuation than others. See below for some common examples:
• Wood
Floors
Low
• Plaster
Walls
Low
• Glass
Windows
Low
• Water
Damp Wood; Aquariums
Medium
• Bricks
Inner and Outer Walls
Medium
• Marble
Inner Walls
Medium
• Paper
Paper Rolls
High
• Concrete
Floors and Outer Walls
High
• Metal
Desks; Partitions
Very High
Materials
Examples
Attenuation
W I R E L E S S N E T W O R K I N G